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July 24, 2009, 08:31 

#141 
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Aram Amouzandeh
Join Date: Mar 2009
Location: Vienna, Vienna, Austria
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Dear all!!
I changed the procedure of parallelising with chtMultiregionFaom as described in the previous post a bit: 3) use the 0.001/air directory as initial directory 0/ 4) run "decomposePar" => processor<n> has now a 0/ and constant/ directory 5) put processor<n>/constant/polyMesh and heater/ into processor<n>/0/air and processor<n>/0/ respectivly and copy the system/ directory into each processor<n>/ directory 6) run "mpirun.openmpi np 4 chtMultiRegionFoam parallel" The simulation runs but aborts during the first time step of the solid calculation: ************************************************** ***** Region: air Courant Number mean: 0 max: 0 Region: air Courant Number mean: 0 max: 0 deltaT = 0.001199041 Time = 0.00119904 Solving for fluid region air diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 3.867589e07, No Iterations 15 Min/max T:min(T) [0 0 0 1 0 0 0] 100 max(T) [0 0 0 1 0 0 0] 632.0841 GAMG: Solving for pd, Initial residual = 1, Final residual = 0.08695774, No Iterations 3 GAMG: Solving for pd, Initial residual = 0.03317856, Final residual = 0.002205762, No Iterations 3 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (air): sum local = 0.0002709278, global = 2.734944e05, cumulative = 2.734944e05 GAMG: Solving for pd, Initial residual = 0.6863633, Final residual = 0.03345041, No Iterations 3 GAMG: Solving for pd, Initial residual = 0.0922989, Final residual = 8.175851e07, No Iterations 13 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (air): sum local = 6.847878e06, global = 9.906124e08, cumulative = 2.725038e05 Solving for solid region heater DICPCG: Solving for T, Initial residual = 1, Final residual = 3.015545e07, No Iterations 1 3 additional processes aborted (not shown) ************************************************** **************** with the following error message: ************************************************** ***************** aa@lws16:~/OpenFOAM/aa1.5.x/run/chtMultiRegionFoam/simpleRegionHeaterParall02$ mpirun.openmpi np 4 chtMultiRegionFoam parallel > log.chtMultiRegionFoam [0] #0 Foam::error:rintStack(Foam::Ostream&)[3] #0 Foam::error:rintStack(Foam::Ostream&) in "/home/aa/OpenFOAM/O in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [0] #1 Foam::sigSegv::sigSegvHandler(int)penFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [3] #1 Foam::sigSegv::sigSegvHandler(int) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [0] #2 in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [3] #2 ???? in "/lib/l in "/lib/libc.so.6" [0] #3 ibc.so.6" [3] #3 Foam::tmp<Foam::Field<Foam::typeOfSum<double, double>::type> > Foam:perator+<double, double>(Foam::UList<double> const&, Foam::UList<double> const&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [3] #4 Foam::tmp<Foam::Field<Foam::typeOfSum<double, double>::type> > Foam:perator+<double, double>(Foam::UList<double> const&, Foam::UList<double> const&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #4 Foam::solidWallMixedTemperatureCoupledFvPatchScala rField::evaluate(Foam::Pstream::commsTypes) in "/home/aa/OpenFOAMFoam::solidWallMixedTemperatureCoupledFvPa tchScalarField::evaluate(Foam::Pstream::commsTypes )/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [3] #5 Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::GeometricBoundaryField::evaluate() in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #5 Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::GeometricBoundaryField::evaluate() in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [3] #6 Foam::fvMatrix<double>::solve(Foam::Istream&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #6 Foam::fvMatrix<double>::solve(Foam::Istream&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libfiniteVolume.so" [0] #7 in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libfiniteVolume.so" [3] #7 Foam::lduMatrix::solverPerformance Foam::solve<double>(Foam::tmp<Foam::fvMatrix<doubl e> > const&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #8 Foam::lduMatrix::solverPerformance Foam::solve<double>(Foam::tmp<Foam::fvMatrix<doubl e> > const&)main in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [3] #8 in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #9 __libc_start_main in "/lib/libc.so.6" [0] #10 main in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [3] #9 __libc_start_main in "/lib/libc.so.6" [3] #10 _start in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [lws16:06857] *** Process received signal *** [lws16:06857] Signal: Segmentation fault (11) [lws16:06857] Signal code: (6) [lws16:06857] Failing at address: 0x3e800001ac9 [lws16:06857] [ 0] /lib/libc.so.6 [0x7f5b913ab0a0] [lws16:06857] [ 1] /lib/libc.so.6(gsignal+0x35) [0x7f5b913ab015] [lws16:06857] [ 2] /lib/libc.so.6 [0x7f5b913ab0a0] [lws16:06857] [ 3] chtMultiRegionFoam(_ZN4FoamplIddEENS_3tmpINS_5Fiel dINS_9typeOfSumIT_T0_E4typeEEEEERKNS_5UListIS4_EER KNSA_IS5_EE+0x68) [0x435108] [lws16:06857] [ 4] chtMultiRegionFoam [0x431f78] [lws16:06857] [ 5] chtMultiRegionFoam(_ZN4Foam14GeometricFieldIdNS_12 fvPatchFieldENS_7volMeshEE22GeometricBoundaryField 8evaluateEv+0xc6) [0x44ed26] [lws16:06857] [ 6] /home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libfiniteVolume.so(_ZN4Foam8fvMatrixIdE5solveERNS_ 7IstreamE+0x19f) [0x7f5b933a1dcf] [lws16:06857] [ 7] chtMultiRegionFoam(_ZN4Foam5solveIdEENS_9lduMatrix 17solverPerformanceERKNS_3tmpINS_8fvMatrixIT_EEEE+ 0x50) [0x44a2e0] [lws16:06857] [ 8] chtMultiRegionFoam [0x440eec] [lws16:06857] [ 9] /lib/libc.so.6(__libc_start_main+0xe6) [0x7f5b91396466] [lws16:06857] [10] chtMultiRegionFoam [0x41c019] [lws16:06857] *** End of error message *** mpirun.openmpi noticed that job rank 0 with PID 6854 on node lws16 exited on signal 15 (Terminated). ************************************************** **** When I decompose the domain into 4 subdomains, subdomain 0 and 3 have no interface with the solid region; whereas with 2 subdomains, both share patches with the solid region, the calculation aborts at the same time as before but the error message looks different: ************************************************** ****** aa@lws16:~/OpenFOAM/aa1.5.x/run/chtMultiRegionFoam/simpleRegionHeaterParall$ mpirun.openmpi np 2 chtMultiRegionFoam parallel > log.chtMultiRegionFoam [0] #0 Foam::error:rintStack(Foam::Ostream&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [0] #1 Foam::sigFpe::sigFpeHandler(int) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/lib/linux64GccDPOpt/libOpenFOAM.so" [0] #2 ?? in "/lib/libc.so.6" [0] #3 double Foam::max<Foam::fvPatchField, double>(Foam::FieldField<Foam::fvPatchField, double> const&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #4 Foam::dimensioned<double> Foam::max<double, Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #5 main in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [0] #6 __libc_start_main in "/lib/libc.so.6" [0] #7 _start in "/home/aa/OpenFOAM/OpenFOAM1.5.x/applications/bin/linux64GccDPOpt/chtMultiRegionFoam" [lws16:05764] *** Process received signal *** [lws16:05764] Signal: Floating point exception (8) [lws16:05764] Signal code: (6) [lws16:05764] Failing at address: 0x3e800001684 [lws16:05764] [ 0] /lib/libc.so.6 [0x7f4208af70a0] [lws16:05764] [ 1] /lib/libc.so.6(gsignal+0x35) [0x7f4208af7015] [lws16:05764] [ 2] /lib/libc.so.6 [0x7f4208af70a0] [lws16:05764] [ 3] chtMultiRegionFoam(_ZN4Foam3maxINS_12fvPatchFieldE dEET0_RKNS_10FieldFieldIT_S2_EE+0x160) [0x44f7c0] [lws16:05764] [ 4] chtMultiRegionFoam(_ZN4Foam3maxIdNS_12fvPatchField ENS_7volMeshEEENS_11dimensionedIT_EERKNS_14Geometr icFieldIS4_T0_T1_EE+0x20) [0x4806e0] [lws16:05764] [ 5] chtMultiRegionFoam [0x441761] [lws16:05764] [ 6] /lib/libc.so.6(__libc_start_main+0xe6) [0x7f4208ae2466] [lws16:05764] [ 7] chtMultiRegionFoam [0x41c019] [lws16:05764] *** End of error message *** mpirun.openmpi noticed that job rank 0 with PID 5764 on node lws16 exited on signal 8 (Floating point exception). ************************************************** **************** I greatly appreciate your comments!! Thx in advace, Aram 

October 14, 2009, 09:29 
using kvariable in solver (objectoriented)

#142 
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Sven Degner
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i got the same problem?
Last edited by sven82; October 14, 2009 at 13:09. 

October 15, 2009, 01:47 

#143 
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Carel
Join Date: Mar 2009
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Can anyone comment on the difference in the methods of the chtMultiRegionFoam solver where each region is solved per timestep with boundary conditions being exchanged vs. the method of Hrvoje which this thread is based on? As I understand it the latter is based on the multiprocessor methodology where data is also exchanged during the inner iterations of the timestep.
Is the one method significantly faster than the other? I am planning to test it, maybe it is so obvious that it does not matter? Regards Carel 

March 9, 2010, 04:15 

#144 
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ouafa
Join Date: Jul 2009
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hi aram,
i've the same problem with chtMultiRegionFoam solver so i can't run it in parallel even after decompositing correctly the solid and fluid region by a little modified decomposePar routine. the error seems to be related to the fact that OF can't find "instance" the polyMesh/points file directly in processor*/constant path. in my case, there is two regions in the processor*/constant: fluid and solid witch contain a polyMesh subdirectory. do you have some idea to help me if you have already run succefully the solver? thank's in advance. 

March 24, 2010, 12:00 

#145 
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Ben K
Join Date: Feb 2010
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Are all isues with conjugateHeatFoam sorted out? I'm using 1.5dev
I'm trying to use a modified version of conjugateHeatFoam but I'm running into some issues with the solution. I'm getting strange behaviour between the two coupled regions and I'm not able to reproduce the solution that I get from Comsol. My problem at the moment is fairly basic: Two steadystate diffusion equations on a 1D domain where the diffusion coefficient changes by 2 orders of magnitude at the interface between the two regions. So I have: Region 1: laplacian(Dleft,c) + 0.1 = 0 (at x=0 c=100) Region 2: laplacian(Dright,c) + 0.1 = 0 (at x=1 c=0) I've done this for 2 cases with the profile of c vs x in the figures below: Case 1: Dleft=10^5, Dright=10^4 Case 2: Dleft=10^5, Dright=10^3 They both give problems at the interface between the two regions (at x=0.5). This is my solver: multiRegionFoam.tgz. Can anybody provide input on this? Case 1: Case 2: Clearly I'm getting some sort of a discontinuity at the interface of the two regions. Any help would be much appreciated! 

March 25, 2010, 10:31 

#146 
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Ben K
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I was able to solve this problem using chtMultiRegionFoam:
I'd still like to know if there's anything that can be done to fix my conjugateHeatFoam model though. 

April 5, 2010, 09:47 

#147 
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Aram Amouzandeh
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hi ouafa,
since I ve used OF1.6. there are no problems to run chtMultiRegionFoam in parallel. which version are you using? did you tried the tutorials? didi they work? aram 

April 7, 2010, 12:52 

#148 
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Ben K
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May 25, 2010, 10:45 
T+T solver

#149 
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Radu Mustata
Join Date: Mar 2009
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Hi, I am using conjugateHeatFoam in order to simulate the cooling of a fuel cell plate. The setup is alright cause the solver runs but the trouble is that it reaches the maximum number of iterations in solving "T+T" whatever solver I choose out of smoothSolver/BiCGStab with any preconditioner. The solid part of the case has also a couple of GGI interfaces to deal with my nonconformal mesh of the various volumes that form the plate. Thing is that the same solid part with laplacianFoam runs much faster. Am I missing/messing something? Any idea much appreciated.
Radu 

May 28, 2010, 11:45 
Temperature rises in the solid too fast!!

#150 
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Leonardo Nettis
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Dear all,
I'm using a DNS inhouse code to validate conjugateHeatFoam. The testcase is a sphere in crossflow at low Re (=28). I'm solving with axisimmetric BCs (wedge) due to the physics of the flow. The thermal diffusivities (k/rho*Cp) are set as follows: air: DT=5.6e5 m^2/s solid: DT=8.1e6 m^2/s The inlet temperature, of the duct surrounding the sphere increases linearly in time, starting from 323K till 623K. The sphere initial temperature is also 323K. Now, according to DNS (and to experimental results as well) the temperature of the sphere should vary non linearly in the beginning with an increasing deltaT with respect to the flow inlet temperature. Then a costant deltaT is reached between sphere and flow, i.e. also the temperature rise in the solid became linear. Summarizing I obtain as final temperature for the solid 593K (final deltaT=30K). Of course I'm not saying that there is a difference between temperature on both sides of the fluid/solid interface. But between the solid and the flow several diameters far from the it. With conjugateHeatFoam, the temperature of the solid (at least at the interface) corresponds within 0.5K to the flow temperature far from it. It seems like the temperature of the solid is adjusted after that one of the fluid is evalueted, although I know the 2 matrix are solved at the same time! I also tried to decrease the DT of the solid (8e8) or to let the flow start with a higher T (353K) than the solid initial one. Nothing changes, that is very strange most of all in the latter case!! In the former one the only effect is a greater deltaT between the center of the sphere and the interface, as it should be since the conduction is slower. But the temperature at the sphere/flow interface it's always very close to the inlet one. Which could be the reason of such strange behaviour?!?!? Suggestions are very welcome. Thanks in advance for your help. Regards, Dino 

May 28, 2010, 14:07 

#151 
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Leonardo Nettis
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ps: I tried to reduce the physical time of the simulation till I achieved the expected deltaT between the sphere and the inlet of the duct. I had to reduce it by a factor of 400x!!


May 31, 2010, 04:03 

#152 
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Aram Amouzandeh
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Hi Dino!
I experienced some problems with axisymmetric setups giving me unphysical results. I had to play around with the BCs to solve it. How did you set up your axisymmetric case (BCs ??). Cheers, Aram 

May 31, 2010, 13:59 

#153 
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Leonardo Nettis
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Dear Aram,
the result of the simulation, at least the uncoupled flow around the sphere, seems to be ok in terms of pressure and velocity. However when I couple the solid part to start the CHT analysis the problem consists in the short time needed for the temperature to propagate in the solid. I don't know if it can be related with the BCs?? However this is the testcase: http://rapidshare.com/files/393717776/sphere.tar.html My only doubt is that in the solid mesh there is no axis declared as SimmetryPlane. In fact I had to create the mesh in Gambit in this case, and it was not possible to do that. Let me know what you think about? Thanks for your availability. Dino 

June 8, 2010, 04:30 

#154 
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Leonardo Nettis
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no idea??
dino 

August 29, 2011, 10:54 

#155  
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maddalena
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Quote:
I would like to have a conjugateHeatFoam version handling n number of solids and fluids. From what you said above, this would require to copy the physics for n times. Is that still true? That is an old post, thus I think something changed meanwhile... Thank you for your time, mad 

September 20, 2011, 14:54 

#156  
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Quote:
Could you please post your files for the conjugateCavity and heatedBlock problem, when I ran conjugateHeatFoam I just obtained results for the conjugateCavity it seems that heatedBlock is not being resolved Thanks Alberto 

September 20, 2011, 18:18 

#157  
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Quote:
Hi I have installed OpenFOAM1.6ext on my Mac, I could compile conjugateHeatFoam solver but when I ran it I got > FOAM FATAL ERROR: Attempt to cast type wall to type lduInterface From function refCast<To>(From&) in file /Users/hjasak/OpenFOAM/OpenFOAM1.6ext/src/OpenFOAM/lnInclude/typeInfo.H at line 115. It is strange to me because the directory /Users/hjasak/OpenFOAM/OpenFOAM1.6ext/src/OpenFOAM/lnInclude does not exist in my Mac Any help is welcome Alberto 

October 14, 2011, 17:33 

#158 
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Hi Professor Hjasak
I am simulating the dynamic and heat transfer behaviour between 2 concentric square ducts with a certain duct wall thickness and when I run my solver I got > FOAM FATAL IO ERROR: Unable to set reference cell for field p2 Please supply either p2RefCell or p2RefPoint have two fluid domains: the core flow and flow between the ducts, I have tried to modify label p2RefCell = 0; For other values scalar p2RefValue = 0.0; but it is not recognize when I run the code, also I have put the same value at my fvSolution file PISO { nCorrectors 2; nNonOrthogonalCorrectors 0; pRefCell Other Value; pRefValue 0; } any help is welcome Thank you Alberto 

October 14, 2011, 22:02 

#159  
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My questions is simpler
How can I deal with to driven cavity flows sorrounding the heated block, I have tried to include a second solveFluid. H subroutine but I got segmentation faul in my code when I ran this case Starting time loop Time = 0.001 Courant Number mean: 0 max: 0 velocity magnitude: 0 DILUPBiCG: Solving for Ux, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0 DICPCG: Solving for p, Initial residual = 0.108226751719, Final residual = 8.51046489737e11, No Iterations 211 time step continuity errors : sum local = 1.13409612376e24, global = 9.40734577639e25, cumulative = 9.40734577639e25 DICPCG: Solving for p, Initial residual = 0.238853085434, Final residual = 7.52846140614e11, No Iterations 212 time step continuity errors : sum local = 2.33840162539e24, global = 2.67278696463e25, cumulative = 1.2080132741e24 FLUID 2 Segmentation fault My main files is Info<< "\nStarting time loop\n" << endl; for (runTime++; !runTime.end(); runTime++) { Info<< "Time = " << runTime.timeName() << nl << endl; # include "solveFluid1.H" # include "solveFluid2.H" # include "solveEnergy_whole.H" runTime.write(); Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s\n\n" << endl; } and for solveFluid2.H I have Info<< "FLUID 2 "<< endl; fvVectorMatrix UEqn2 ( fvm::ddt(U2) + fvm::div(phi2, U2)  fvm::laplacian(nu, U2) ); solve(UEqn2 == fvc::grad(p2)); //  PISO loop for (int corr2 = 0; corr2 < nCorr; corr2++) { volScalarField rUA2 = 1.0/UEqn2.A(); U2 = rUA2*UEqn2.H(); phi2 = (fvc::interpolate(U2) & meshLiquid2.Sf()) + fvc::ddtPhiCorr(rUA2, U2, phi2); adjustPhi(phi2, U2, p2); for (int nonOrth2 = 0; nonOrth2 <= nNonOrthCorr; nonOrth2++) { fvScalarMatrix pEqn2 ( fvm::laplacian(1.0/UEqn2.A(), p2) == fvc::div(phi2) ); pEqn2.setReference(p2RefCell, p2RefValue); pEqn2.solve(); if (nonOrth2 == nNonOrthCorr) { phi2 = pEqn2.flux(); } } # include "continuityErrs.H" U2 = fvc::grad(p2)/UEqn2.A(); U2.correctBoundaryConditions(); } I declare a field phi2 in createFields.H as Info<< "Reading field phi2\n" << endl; surfaceScalarField phi2 ( IOobject ( "phi2", runTime.timeName(), meshLiquid2, IOobject::NO_READ, IOobject::NO_WRITE ), phi ); but clearly something is wrong when the code tried to solve the second fluid domain, Is there any example or forum which could be useful? Any help is welcome, Thank you Alberto Quote:


November 3, 2011, 17:50 

#160  
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Hi Mike
Could you please uploaded the sample dictionary used to pull the data points out, again?, the link is not available ! Thanks Alberto Quote:


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