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chtMultiRegionSimpleFoam: maximum number of iterations excedeed. 

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February 5, 2016, 10:45 
chtMultiRegionSimpleFoam: maximum number of iterations excedeed.

#1 
Member
Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Hi everyone.
I am trying to simulate a case with chtMultiRegionSimpleFoam. I have two solid regions and one fluid region. This is the error message that i get when i try to run the case. Code:
Time = 1 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.002480292, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.03671355, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9999997, Final residual = 0.01561736, No Iterations 1 Min/max T:562.9999 563 GAMG: Solving for p_rgh, Initial residual = 0.9999924, Final residual = 0.008730997, No Iterations 6 time step continuity errors : sum local = 20506.89, global = 26.95327, cumulative = 26.95327 Min/max rho:1871.519 1871.519 DILUPBiCG: Solving for epsilon, Initial residual = 0.09139717, Final residual = 0.0005513963, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.02256889, No Iterations 1 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.5280382, Final residual = 0.001258966, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.3690461, Final residual = 0.002262562, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1604709, Final residual = 0.0009344701, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1126575, Final residual = 0.0007983021, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08671032, Final residual = 0.0007140963, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09292769, Final residual = 0.0007248033, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1074406, Final residual = 0.0007217357, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08790488, Final residual = 0.0006937387, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08910365, Final residual = 0.0006455751, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1082888, Final residual = 0.000716009, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08564961, Final residual = 0.0007132726, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09113913, Final residual = 0.0006894596, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1045455, Final residual = 0.0006481019, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08687302, Final residual = 0.0006629876, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08842034, Final residual = 0.0006584863, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1070657, Final residual = 0.0006447156, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08507228, Final residual = 0.0006544767, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09051075, Final residual = 0.0006668173, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051791, Final residual = 0.0006743241, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0865891, Final residual = 0.0006571282, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08850392, Final residual = 0.0006297229, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1072329, Final residual = 0.0006522072, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 0.22 s ClockTime = 0 s Time = 2 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.8748544, Final residual = 0.01853232, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.6139603, Final residual = 0.006541587, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9839853, Final residual = 0.09201838, No Iterations 1 Min/max T:1294.7 2492.159 GAMG: Solving for p_rgh, Initial residual = 0.9988731, Final residual = 0.002823299, No Iterations 2 time step continuity errors : sum local = 1.13883e+07, global = 14690.11, cumulative = 14663.16 Min/max rho:1800 2000 DILUPBiCG: Solving for epsilon, Initial residual = 0.2557687, Final residual = 0.001599441, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.7537869, Final residual = 0.004870482, No Iterations 1 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.1426549, Final residual = 0.000527261, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.08523395, Final residual = 0.0006670678, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09039161, Final residual = 0.0006447351, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1052049, Final residual = 0.0006316827, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08715248, Final residual = 0.0006589468, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08851995, Final residual = 0.0006325161, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.107094, Final residual = 0.0006640415, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08470138, Final residual = 0.000640998, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09057836, Final residual = 0.0006554425, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051921, Final residual = 0.0006551075, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0865938, Final residual = 0.0006458004, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0886378, Final residual = 0.0006173178, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1077172, Final residual = 0.0006610182, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08484742, Final residual = 0.0006648984, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09022893, Final residual = 0.0006424737, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051718, Final residual = 0.0006476323, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08702445, Final residual = 0.0006426613, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08855915, Final residual = 0.0006607156, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1069757, Final residual = 0.0006330477, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08519058, Final residual = 0.0006546551, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09064632, Final residual = 0.0006672477, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051225, Final residual = 0.0006524659, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 0.27 s ClockTime = 0 s Time = 3 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.01074519, Final residual = 3.067248e05, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.04582875, Final residual = 0.0003332501, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.2011091, Final residual = 0.00402989, No Iterations 1 > FOAM FATAL ERROR: Maximum number of iterations exceeded From function thermo<Thermo, Type>::T(scalar f, scalar T0, scalar (thermo<Thermo, Type>::*F)(const scalar) const, scalar (thermo<Thermo, Type>::*dFdT)(const scalar) const, scalar (thermo<Thermo, Type>::*limit)(const scalar) const) const in file /home/openfoam/OpenFOAM/OpenFOAM2.3.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>::THs(double, double, double) const at ??:? #3 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::calculate() at ??:? #4 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::correct() at ??:? #5 at ??:? #6 __libc_start_main in "/lib/x86_64linuxgnu/libc.so.6" #7 at ??:? Annullato (core dump creato) Code:
/** C++ **\  =========    \\ / F ield  OpenFOAM: The Open Source CFD Toolbox   \\ / O peration  Version: 2.3.1   \\ / A nd  Web: www.OpenFOAM.org   \\/ M anipulation   \**/ FoamFile { version 2.0; format ascii; class dictionary; location "system"; object controlDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // application chtMultiRegionSimpleFoam; startFrom startTime; startTime 0; stopAt endTime; endTime 50000; deltaT 1; writeControl timeStep; writeInterval 100; purgeWrite 5; writeFormat ascii; writePrecision 7; writeCompression uncompressed; timeFormat general; timePrecision 6; runTimeModifiable true; // ************************************************************************* // 

February 5, 2016, 13:46 

#2 
Senior Member
Alex
Join Date: Oct 2013
Posts: 337
Rep Power: 17 
Hi Nikola,
Well, more information is needed in order to be able to help you, take a look at this thread! For instance, information regarding the BC's would come in handy! A few comments about your case:
However, as I said before, it is totally impossible to give you a hand without the minimum required information since we don't know what your case is about. Best regards, Alex
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 9, 2016, 05:34 

#3 
Member
Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Hi and thanks! Here is the link to my case:
https://www.dropbox.com/sh/0urwdyk35...wVgQUdLUa?dl=0 In this moment I am trying to figure out as well why foam says that my mesh is inconsistent  when I got the "maximum number of iterations error" I was employing a different mesh. Here is the blockMeshDict file of the liquid region, I don't see any inconsistency: Code:
/** C++ **\  =========    \\ / F ield  OpenFOAM: The Open Source CFD Toolbox   \\ / O peration  Version: 2.3.1   \\ / A nd  Web: www.OpenFOAM.org   \\/ M anipulation   \**/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 0.001; vertices ( (0 0 0) (24.35 0 0) (26 0 0) (28.50 0 0) (0 250 0) (24.35 250 0) (26 250 0) (28.50 250 0) (0 10250 0) (24.35 10250 0) (26 10250 0) (28.50 10250 0) (24.35 10471.50 0) (26 10471.50 0) (28.50 10471.50 0) (0 10495.20 0) (0 10496.85 0) (0 10498.35 0) (0 0 0.3) (24.35 0 0.3) (26 0 0.3) (28.50 0 0.3) (0 250 0.3) (24.35 250 0.3) (26 250 0.3) (28.50 250 0.3) (0 10250 0.3) (24.35 10250 0.3) (26 10250 0.3) (28.50 10250 0.3) (24.35 10471.50 0.3) (26 10471.50 0.3) (28.50 10471.50 0.3) (0 10495.20 0.3) (0 10496.85 0.3) (0 10498.35 0.3) ); blocks ( hex (0 1 5 4 18 19 23 22) (24 250 1) simpleGrading (1 1 1) hex (2 3 7 6 20 21 25 24) (2 250 1) simpleGrading (1 1 1) hex (4 5 9 8 22 23 27 26) (24 100 1) simpleGrading (1 1 1) hex (6 7 11 10 24 25 29 28) (2 100 1) simpleGrading (1 1 1) hex (8 9 12 15 26 27 30 33) (24 245 1) simpleGrading (1 1 1) hex (10 11 14 13 28 29 32 31) (2 221 1) simpleGrading (1 1 1) hex (12 13 16 15 30 31 34 33) (2 26 1) simpleGrading (1 1 1) hex (13 14 17 16 31 32 35 34) (2 28 1) simpleGrading (1 1 1) ); edges ( arc 15 12 (17.21805012 10488.71805 0) arc 33 30 (17.21805012 10488.71805 0.3) arc 16 13 (18.38477631 10489.88478 0) arc 34 31 (18.38477631 10489.88478 0.3) arc 17 14 (20.152543226 10491.65254326 0) arc 35 32 (20.152543226 10491.65254326 0.3) ); boundary ( inlet { type patch; faces ( (2 3 21 20) ); } outlet { type patch; faces ( (0 1 19 18) ); } walls { type wall; faces ( (1 5 23 19) (5 9 27 23) (9 12 30 27) (12 13 31 30) (13 10 28 31) (10 6 24 28) (6 2 20 24) (3 7 25 21) (7 11 29 25) (11 14 32 29) (14 17 35 32) ); } left { type symmetryPlane; faces ( (4 0 18 22) (8 4 22 26) (15 8 26 33) (16 15 33 34) (17 16 34 35) ); } frontAndBack { type empty; faces ( (0 4 5 1) (2 6 7 3) (4 8 9 5) (6 10 11 7) (8 15 12 9) (10 13 14 11) (12 15 16 13) (13 16 17 14) (18 22 23 19) (20 24 25 21) (22 26 27 23) (24 28 29 25) (26 33 30 27) (28 31 32 29) (30 33 34 31) (31 34 35 32) ); } ); mergePatchPairs ( ); // ************************************************************************* // 

February 9, 2016, 12:12 

#4 
Senior Member
Alex
Join Date: Oct 2013
Posts: 337
Rep Power: 17 
Hi Nikola,
First of all, please, take a look at this thread in order to ask your questions correctly. I have no time to invest in running your case and find your mistakes for you. However, if you attach your log file with the error message I will be able to see what is going wrong. By the way, have you checked your mesh with checkMesh utility? Best regards, Alex
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 9, 2016, 12:20 

#5 
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Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Hi,
Ok, i guess the entire case is too general, sorry. As I wrote in the second question I have modified the geometry of a region, but when I run blockMesh it says there is a block inconsistency. I've posted my blockMeshDict file. After I fix that, I will run the case again, post a screen of the geometry and send you the error log. Do you know how do I solve the block inconsistency problem? Thanks again. 

February 9, 2016, 12:24 

#6  
Senior Member
Alex
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Quote:
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 9, 2016, 12:27 

#7 
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Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
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I didn't specify cause from what I searched it is a common error depending on the number of cells of the blocks. I tried to change many times the values, to me it seems to make sense.
Here is the error message I get: Code:
Create time Generating mesh for region moltenSalt Creating block mesh from "/home/nikola/OpenFOAM/nikola2.3.1/run/PhD/receiverMultiRegion2/constant/moltenSalt/polyMesh/blockMeshDict" Creating curved edges Creating topology blocks Creating topology patches Creating block mesh topology Check topology Basic statistics Number of internal faces : 7 Number of boundary faces : 34 Number of defined boundary faces : 34 Number of undefined boundary faces : 0 Checking patch > block consistency Creating block offsets Creating merge list > FOAM FATAL ERROR: Inconsistent number of faces between block pair 4 and 6 From function blockMesh::calcMergeInfo() in file blockMesh/blockMeshMerge.C at line 221. FOAM exiting 

February 9, 2016, 12:43 

#8 
Senior Member
Alex
Join Date: Oct 2013
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Great! Here we can start looking for something...
Look at these lines Code:
> FOAM FATAL ERROR: Inconsistent number of faces between block pair 4 and 6 Code:
blocks ( hex (0 1 5 4 18 19 23 22) (24 250 1) simpleGrading (1 1 1) hex (2 3 7 6 20 21 25 24) (2 250 1) simpleGrading (1 1 1) hex (4 5 9 8 22 23 27 26) (24 100 1) simpleGrading (1 1 1) hex (6 7 11 10 24 25 29 28) (2 100 1) simpleGrading (1 1 1) hex (8 9 12 15 26 27 30 33) (24 245 1) simpleGrading (1 1 1) hex (10 11 14 13 28 29 32 31) (2 221 1) simpleGrading (1 1 1) hex (12 13 16 15 30 31 34 33) (2 26 1) simpleGrading (1 1 1) hex (13 14 17 16 31 32 35 34) (2 28 1) simpleGrading (1 1 1) ); Hope it helps! Alex
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 9, 2016, 12:51 

#9 
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Nikola
Join Date: Sep 2013
Location: Madrid, Spain
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Thanks, but I already tried to change the values to these blocks but it doesn't seem to work.
The contact face is a semicircular one. I set the number of cells in order that each one is 1mm x 1mm. 

February 9, 2016, 12:57 

#10 
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Alex
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But you cannot change these values in a random manner. If two blocks have a common face, these two faces have to be divided into the same number of faces. Check again the numbers I marked in bold in my previous post!
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 9, 2016, 18:18 

#11 
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Nikola
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I know i cannot change the numbers in a random way and i know they need to have the same number of faces. The problem is that the semicircular surface, which is the border between the two blocks, is not orthogonal to the axis. How do I determine the number of cells in this case?


February 9, 2016, 20:39 

#12  
Senior Member
Alex
Join Date: Oct 2013
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Quote:
__________________
Web site where I present my Master's Thesis: foamingtime.wordpress.com The case I talk about in this site was solved with chtMultiRegionSimpleFoam solver and involves radiation. Some basic tutorials are also resolved step by step in the web. If you are interested in these matters, you are invited to come in! 

February 10, 2016, 07:31 

#13 
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Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
I am sorry for the too many posts and the incorrect way of asking questions.
I fixed the mesh and checkMesh seems to work properly for all the three regions. Here are the log files: https://www.dropbox.com/s/q78uoqq72g...nSalt.log?dl=0 https://www.dropbox.com/s/dhx7oobzm3...wall1.log?dl=0 https://www.dropbox.com/s/z57ivq9iul...wall2.log?dl=0 When I run the solver 'chtMultiRegionSimpleFoam' I get this error message after 3 iterations: Code:
Time = 1 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.002825982, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.04132034, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9999996, Final residual = 0.0154298, No Iterations 1 Min/max T:562.9994 563.0009 GAMG: Solving for p_rgh, Initial residual = 0.9999889, Final residual = 0.004834167, No Iterations 6 GAMG: Solving for p_rgh, Initial residual = 0.002394688, Final residual = 2.371736e05, No Iterations 65 GAMG: Solving for p_rgh, Initial residual = 2.341292e05, Final residual = 1.514739e06, No Iterations 1000 GAMG: Solving for p_rgh, Initial residual = 1.535508e06, Final residual = 9.919197e08, No Iterations 563 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.923936e08, Final residual = 9.923936e08, No Iterations 0 time step continuity errors : sum local = 0.4699706, global = 0.0009671473, cumulative = 0.0009671473 Min/max rho:1871.518 1871.519 DILUPBiCG: Solving for epsilon, Initial residual = 0.06467489, Final residual = 0.001771638, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.09235881, No Iterations 1 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.5280382, Final residual = 0.001258966, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.3690461, Final residual = 0.002262562, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1604709, Final residual = 0.0009344701, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1126575, Final residual = 0.0007983021, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08671032, Final residual = 0.0007140963, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09292769, Final residual = 0.0007248033, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1074406, Final residual = 0.0007217357, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08790488, Final residual = 0.0006937387, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08910365, Final residual = 0.0006455751, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1082888, Final residual = 0.000716009, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08564961, Final residual = 0.0007132726, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09113913, Final residual = 0.0006894596, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1045455, Final residual = 0.0006481019, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08687302, Final residual = 0.0006629876, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08842034, Final residual = 0.0006584863, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1070657, Final residual = 0.0006447156, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08507228, Final residual = 0.0006544767, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09051075, Final residual = 0.0006668173, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051791, Final residual = 0.0006743241, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0865891, Final residual = 0.0006571282, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08850392, Final residual = 0.0006297229, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1072329, Final residual = 0.0006522072, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 2.54 s ClockTime = 3 s Time = 2 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.872695, Final residual = 0.02930037, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.2661313, Final residual = 0.02074659, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9749577, Final residual = 0.005849796, No Iterations 2 Min/max T:884.8169 3257.34 GAMG: Solving for p_rgh, Initial residual = 0.9985905, Final residual = 0.002927187, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.003673249, Final residual = 3.331033e05, No Iterations 5 GAMG: Solving for p_rgh, Initial residual = 3.330113e05, Final residual = 3.290616e07, No Iterations 783 GAMG: Solving for p_rgh, Initial residual = 3.290705e07, Final residual = 9.974295e08, No Iterations 440 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.974231e08, Final residual = 9.974231e08, No Iterations 0 time step continuity errors : sum local = 304.0205, global = 1.367212, cumulative = 1.368179 Min/max rho:1800 2000 DILUPBiCG: Solving for epsilon, Initial residual = 0.1267599, Final residual = 0.009777908, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.5708649, Final residual = 0.02911266, No Iterations 1 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.1426549, Final residual = 0.000527261, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.08523395, Final residual = 0.0006670678, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09039161, Final residual = 0.0006447351, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1052049, Final residual = 0.0006316827, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08715248, Final residual = 0.0006589468, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08851995, Final residual = 0.0006325161, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.107094, Final residual = 0.0006640415, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08470138, Final residual = 0.000640998, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09057836, Final residual = 0.0006554425, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051921, Final residual = 0.0006551075, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0865938, Final residual = 0.0006458004, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.0886378, Final residual = 0.0006173178, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1077172, Final residual = 0.0006610182, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08484742, Final residual = 0.0006648984, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09022893, Final residual = 0.0006424737, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051718, Final residual = 0.0006476323, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08702445, Final residual = 0.0006426613, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08855915, Final residual = 0.0006607156, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1069757, Final residual = 0.0006330477, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.08519058, Final residual = 0.0006546551, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.09064632, Final residual = 0.0006672477, No Iterations 1 DICPCG: Solving for h, Initial residual = 0.1051225, Final residual = 0.0006524659, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 4.34 s ClockTime = 5 s Time = 3 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.02314685, Final residual = 0.0005031902, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.08500071, Final residual = 0.0024218, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.06128905, Final residual = 0.0003700965, No Iterations 1 > FOAM FATAL ERROR: Maximum number of iterations exceeded From function thermo<Thermo, Type>::T(scalar f, scalar T0, scalar (thermo<Thermo, Type>::*F)(const scalar) const, scalar (thermo<Thermo, Type>::*dFdT)(const scalar) const, scalar (thermo<Thermo, Type>::*limit)(const scalar) const) const in file /home/openfoam/OpenFOAM/OpenFOAM2.3.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>::THs(double, double, double) const at ??:? #3 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::calculate() at ??:? #4 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::correct() at ??:? #5 at ??:? #6 __libc_start_main in "/lib/x86_64linuxgnu/libc.so.6" #7 at ??:? Annullato (core dump creato) Here are the files moltenSalt region: https://www.dropbox.com/s/3gl4leenps...fvSchemes?dl=0 https://www.dropbox.com/s/jw7fqxh7to...vSolution?dl=0 wall regions: https://www.dropbox.com/s/fzxdzsi2l8...fvSchemes?dl=0 https://www.dropbox.com/s/zr2snw4qdm...vSolution?dl=0 I hope I didn't post too many things again. Thanks and sorry again! 

February 15, 2016, 06:46 

#14 
Member
Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Anybody could help?


February 16, 2016, 05:24 

#15 
Member
Joćo Ferreira
Join Date: Nov 2014
Location: Braga, Portugal
Posts: 53
Rep Power: 7 
Hi,
have you tried to lower the relaxation factor of h? As the temperatures blow up on the second iteration, it might help. I don't know if you tested it already 

February 16, 2016, 10:19 

#16 
Member
Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Thanks. I lowered the relaxation factor for h from 0.7 to 0.3. The solver now reaches time=5 but then crashes again. This is the fatal error I get:
Code:
Time = 1 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.0003264315, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.005378647, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9999952, Final residual = 0.000984237, No Iterations 1 Min/max T:562.9999 563.0001 GAMG: Solving for p_rgh, Initial residual = 0.9999951, Final residual = 0.005289151, No Iterations 6 GAMG: Solving for p_rgh, Initial residual = 0.002618408, Final residual = 2.607994e05, No Iterations 68 GAMG: Solving for p_rgh, Initial residual = 2.575757e05, Final residual = 6.033973e07, No Iterations 1000 GAMG: Solving for p_rgh, Initial residual = 6.117042e07, Final residual = 9.858678e08, No Iterations 533 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.86257e08, Final residual = 9.86257e08, No Iterations 0 time step continuity errors : sum local = 0.4605076, global = 8.085596e05, cumulative = 8.085596e05 Min/max rho:1871.519 1871.519 DILUPBiCG: Solving for epsilon, Initial residual = 0.06521978, Final residual = 0.001787177, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.07889281, No Iterations 1 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.5101815, Final residual = 0.0001297209, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.5112915, Final residual = 0.0002025927, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 2.59 s ClockTime = 3 s Time = 2 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.6445604, Final residual = 0.0019006, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.07135245, Final residual = 0.0007496466, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.9083394, Final residual = 0.01430983, No Iterations 1 Min/max T:35.65297 1889.626 GAMG: Solving for p_rgh, Initial residual = 0.9998192, Final residual = 0.002216853, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.007889519, Final residual = 7.822511e05, No Iterations 6 GAMG: Solving for p_rgh, Initial residual = 7.824874e05, Final residual = 7.810568e07, No Iterations 261 GAMG: Solving for p_rgh, Initial residual = 7.811e07, Final residual = 9.961736e08, No Iterations 904 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.961807e08, Final residual = 9.961807e08, No Iterations 0 time step continuity errors : sum local = 75.72265, global = 0.5355312, cumulative = 0.5354504 Min/max rho:1800 2000 DILUPBiCG: Solving for epsilon, Initial residual = 0.1176014, Final residual = 0.01003929, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.485968, Final residual = 0.003753748, No Iterations 2 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.2623717, Final residual = 5.387229e05, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.1440557, Final residual = 8.869466e05, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 4.28 s ClockTime = 5 s Time = 3 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.0006579773, Final residual = 6.510305e07, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.002377684, Final residual = 1.232516e05, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.04466604, Final residual = 2.46947e05, No Iterations 1 Min/max T:112.0722 1815.252 GAMG: Solving for p_rgh, Initial residual = 0.9977593, Final residual = 0.003774196, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.001897838, Final residual = 1.867311e05, No Iterations 337 GAMG: Solving for p_rgh, Initial residual = 1.862081e05, Final residual = 2.786867e06, No Iterations 1000 GAMG: Solving for p_rgh, Initial residual = 2.783504e06, Final residual = 1.293305e07, No Iterations 1000 GAMG: Solving for p_rgh, Initial residual = 1.293191e07, Final residual = 9.987048e08, No Iterations 18 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.987045e08, Final residual = 9.987045e08, No Iterations 0 time step continuity errors : sum local = 119.8354, global = 0.4635982, cumulative = 0.9990486 Min/max rho:1800 2000 DILUPBiCG: Solving for epsilon, Initial residual = 0.04836913, Final residual = 0.001498709, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.3789519, Final residual = 0.002761163, No Iterations 2 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.09316923, Final residual = 2.737059e05, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.07516395, Final residual = 4.386694e05, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 7.64 s ClockTime = 8 s Time = 4 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.765953, Final residual = 0.008731101, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.2308538, Final residual = 0.001827885, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.999978, Final residual = 0.01399727, No Iterations 1 Min/max T:102136.9 93478.23 GAMG: Solving for p_rgh, Initial residual = 0.9999905, Final residual = 8.936352e06, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 2.701559e05, Final residual = 2.408767e07, No Iterations 19 GAMG: Solving for p_rgh, Initial residual = 2.408695e07, Final residual = 9.989073e08, No Iterations 314 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 GAMG: Solving for p_rgh, Initial residual = 9.98878e08, Final residual = 9.98878e08, No Iterations 0 time step continuity errors : sum local = 52216.37, global = 81.95447, cumulative = 80.95542 Min/max rho:1800 2000 DILUPBiCG: Solving for epsilon, Initial residual = 0.5315941, Final residual = 0.01739989, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.8941032, Final residual = 0.008152165, No Iterations 1 bounding k, min: 22430.99 max: 1283287 average: 13658.63 Solving for solid region wall1 DICPCG: Solving for h, Initial residual = 0.05225653, Final residual = 9.536828e06, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 563 max(T) [0 0 0 1 0 0 0] 563 Solving for solid region wall2 DICPCG: Solving for h, Initial residual = 0.04101362, Final residual = 2.849273e05, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 873 max(T) [0 0 0 1 0 0 0] 873 ExecutionTime = 8.16 s ClockTime = 9 s Time = 5 Solving for fluid region moltenSalt DILUPBiCG: Solving for Ux, Initial residual = 0.005961712, Final residual = 6.706337e08, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.07593738, Final residual = 0.0001346784, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.001921711, Final residual = 7.76007e06, No Iterations 1 > FOAM FATAL ERROR: Maximum number of iterations exceeded From function thermo<Thermo, Type>::T(scalar f, scalar T0, scalar (thermo<Thermo, Type>::*F)(const scalar) const, scalar (thermo<Thermo, Type>::*dFdT)(const scalar) const, scalar (thermo<Thermo, Type>::*limit)(const scalar) const) const in file /home/openfoam/OpenFOAM/OpenFOAM2.3.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>::THs(double, double, double) const at ??:? #3 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::calculate() at ??:? #4 Foam::heRhoThermo<Foam::rhoThermo, Foam::pureMixture<Foam::polynomialTransport<Foam::species::thermo<Foam::hPolynomialThermo<Foam::icoPolynomial<Foam::specie, 8>, 8>, Foam::sensibleEnthalpy>, 8> > >::correct() at ??:? #5 at ??:? #6 __libc_start_main in "/lib/x86_64linuxgnu/libc.so.6" #7 at ??:? Annullato (core dump creato) 

February 16, 2016, 10:46 

#17 
New Member
Karl Lindqvist
Join Date: Jul 2012
Posts: 21
Rep Power: 10 
Dear Nikola,
It seems that you have done the common mistake of trying to do too much in one step without ensuring you have a working, intermediate case first. I strongly advise you to start with something really basic (like the planeWall2D tutorial) and build on it step by step so that you are able to understand why a certain step causes the simulation to crash. This will save you a lot of headache working with OF. If you did start from a simpler case, it would be useful to know at which stage you started experiencing problems Nevertheless, here are some hints on things to consider for the case you posted earlier:
Best regards, Karl 

February 16, 2016, 10:54 

#18 
Senior Member
Olivier
Join Date: Jun 2009
Location: France, grenoble
Posts: 272
Rep Power: 14 
hello,
Your fluid temperature goes to dumb value. You may have either bad BC, bad initialisation value for T,or excessive heat source somewhere. So: 1) check your BC (every BC, even turbulence file ...). This is where 6080% mistake are made. 2) Try to initialize with a better guess of the solution 3) If you have heat source: try to relax source 4) if you still in trouble at startup, use a higher value for conductivity in your fluid (10 to 100 higher), then come back to the correct one after 1050 iter. And lower this crazy high number of pressure orthogonal iteration. regards, olivier 

February 16, 2016, 11:42 

#19 
Member
Nikola
Join Date: Sep 2013
Location: Madrid, Spain
Posts: 60
Rep Power: 8 
Thanks for the suggestions!
To Karl:  I did start with Plane Wall 2D, but it seems it was not enough.  What you are saying regarding Yplus values is true. This is because in the y direction the domain is 10.5 meters long, so in the middle I used extremely large cells in order to reduce the computational time. That could be a problem, I guess.  I lowered the relaxation factor for U and corrected the velocity, that was a distraction. Thanks! To Olivier:  Thanks for the tips, I'll check again all my BC. Regarding the pressure orthogonal iteration I took the value from another Heat Transfer tutorial case using chtMultiRegionSimpleFoam. I'll lower it btw. 

October 10, 2019, 02:42 
Iterations for h running double the time

#20 
Member
Vishsel
Join Date: May 2019
Posts: 53
Rep Power: 3 
Hi all,
I am using chtMultiRegionSimpleFoam solver. I have both solid and fluid region. And i have to create heat flux on the wall of the solid body. for my case, i just run the solver & I checked the convergence plot at 500 iterations, in that solving for 'h' alone running double the time. May i know what error it is ?? I have attached the plot picture. 

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