|
[Sponsors] |
Turbulence modelling in chrmultiregionsimplefoam |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
March 16, 2017, 03:34 |
Turbulence modelling in chrmultiregionsimplefoam
|
#1 |
Member
carno
Join Date: Mar 2009
Posts: 70
Rep Power: 17 |
HI All,
I have been trying to solve a CHT problem, with air, water and solid. It is a test case before solving the main problem. It is a simple box with two tubes. Box is of steel and two tubes contain water and gas respectively. I have solved the case with Laminar case and results are reasonable. But as soon as I twitched on turbulence model with "turbulence true;" in the turbulence properties dict, the run crashes. I have tried numerous combinations. The run goes well when "turbulence false;" Please help ! |
|
March 17, 2017, 02:52 |
|
#2 |
New Member
Join Date: Jan 2017
Posts: 11
Rep Power: 9 |
Turbulence= true?
Upload your turbulence files and the log of the error you're getting. What turbulence model are you using? |
|
March 20, 2017, 07:57 |
|
#3 |
Member
carno
Join Date: Mar 2009
Posts: 70
Rep Power: 17 |
Code:
FoamFile { version 2.0; class dictionary; format ascii; location "constant"; object turbulenceProperties; } simulationType RAS; RAS { printCoeffs on; RASModel kEpsilon; turbulence true; kEpsilonCoeffs { C3 -0.33; Cmu 0.09; sigmak 1.0; C1 1.44; sigmaEps 1.3; C2 1.92; } } Code:
Time = 7 Solving for fluid region gas DILUPBiCG: Solving for Ux, Initial residual = 0.9998339, Final residual = 6.225594e-005, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.9997901, Final residual = 9.356765e-005, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 0.9999247, Final residual = 6.460889e-005, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 4.503303e-005, No Iterations 1 Min/max T:300 650 DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = 9.244747e-005, No Iterations 259 DICPCG: Solving for p_rgh, Initial residual = 2.396295e-005, Final residual = 8.989188e-007, No Iterations 20 DICPCG: Solving for p_rgh, Initial residual = 8.997803e-007, Final residual = 8.997803e-007, No Iterations 0 DICPCG: Solving for p_rgh, Initial residual = 8.997803e-007, Final residual = 8.997803e-007, No Iterations 0 time step continuity errors : sum local = 1.405708e+047, global = 6.975396e+042, cumulative = 6.975396e+042 Min/max rho:0.5365993 1.16163 DILUPBiCGStab: Solving for epsilon, Initial residual = 1, Final residual = 4.706257e-008, No Iterations 6 bounding epsilon, min: -3.629814e+084 max: 2.95134e+086 average: 6.291088e+081 DILUPBiCGStab: Solving for k, Initial residual = 1, Final residual = 5.365471e-008, No Iterations 5 bounding k, min: -4.599895e+068 max: 3.286911e+090 average: 2.401271e+066 Solving for fluid region water DILUPBiCG: Solving for Ux, Initial residual = 0.9992455, Final residual = 8.898344e-005, No Iterations 5 DILUPBiCG: Solving for Uy, Initial residual = 0.9928763, Final residual = 8.119978e-005, No Iterations 5 DILUPBiCG: Solving for Uz, Initial residual = 0.9997006, Final residual = 7.40432e-005, No Iterations 5 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = nan, No Iterations 1001 Min/max T:300 650 DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = nan, No Iterations 501 DICPCG: Solving for p_rgh, Initial residual = nan, Final residual = nan, No Iterations 501 --> FOAM FATAL IO ERROR: wrong token type - expected Scalar, found on line 0 the word 'nan' file: E:/water/data.solverPerformance.p_rgh at line 0. --> FOAM Warning : From function Foam::Istream& Foam::operator>>(Foam::Istream&, Foam::doubleScalar&) in file lnInclude/Scalar.C at line 107. FOAM exiting Last edited by Carno; March 23, 2017 at 01:27. |
|
March 20, 2017, 21:42 |
|
#4 |
Member
carno
Join Date: Mar 2009
Posts: 70
Rep Power: 17 |
Are these warnings anything to do with this problem?
I am using windows version. Code:
--> FOAM Warning : From function dlOpen(const fileName&, const bool) in file MSwindows.C at line 1313 \ dlopen error : "Error 126: The specified module could not be found. " --> FOAM Warning : From function dlLibraryTable::open(const fileName&, const bool) in file db/dynamicLibrary/dlLibraryTable/dlLibraryTable.C at line 99 could not load "libturbulenceModelSchemes.dll" |
|
March 21, 2017, 03:06 |
|
#5 |
New Member
Join Date: Jan 2017
Posts: 11
Rep Power: 9 |
From your log, it seems like there is something wrong with this file:
"E:/Speed/08_Work/SimTest/Test/Test/system/water/data.solverPerformance.p_rgh" I'm not sure if this is a file from the set up (it seems like there is some divergence in the simulation) but if it is, please upload it so I can take a look. Or better yet, upload your case Last edited by Jack80; March 21, 2017 at 06:21. |
|
March 23, 2017, 01:14 |
|
#6 |
Member
carno
Join Date: Mar 2009
Posts: 70
Rep Power: 17 |
Thanks for the reply. I do not see any such file. How can upload the case? Give me some idea.. It is 11 MB
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
steady state turbulence modelling?? | neprendo | FLUENT | 1 | April 3, 2014 04:27 |
Aerofoil Modelling - Laminar approximation, transition and turbulence modelling. | Asatorae | STAR-CCM+ | 1 | January 20, 2014 05:25 |
kOmegaSST without turbulence modelling of the flow around geometry | CFDnewbie147 | OpenFOAM Running, Solving & CFD | 7 | December 5, 2013 07:29 |
modelling transition with v2f turbulence model | pablo | FLUENT | 0 | August 7, 2006 15:44 |
Question about Low Re turbulence modelling. | ghlee | Main CFD Forum | 1 | May 28, 1999 19:29 |