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Problem solved: http://www.cfd-online.com/Forums/ope...-v1-6-a-3.html
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keyword nu is undefined in dictionary...
hi!!!!!
i have problem, after icoFoam: --> FOAM FATAL IO ERROR: keyword nu is undefined in dictionary "/home/medet/OpenFOAM/medet-1.7.1/run/tutorials/multiphase/interFoam/laminar/damBreak/constant/transportProperties" file: /home/medet/OpenFOAM/medet-1.7.1/run/tutorials/multiphase/interFoam/laminar/damBreak/constant/transportProperties from line 20 to line 62. From function dictionary::lookupEntry(const word&, bool, bool) const in file db/dictionary/dictionary.C at line 395. FOAM exiting ////////////////////////////////////////////////////////////////////////////////////// transportProperties : phase1 { transportModel Newtonian; nu nu [ 0 2 -1 0 0 0 0 ] 1e-06; rho rho [ 1 -3 0 0 0 0 0 ] 1000; CrossPowerLawCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; m m [ 0 0 1 0 0 0 0 ] 1; n n [ 0 0 0 0 0 0 0 ] 0; } BirdCarreauCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 0.0142515; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; k k [ 0 0 1 0 0 0 0 ] 99.6; n n [ 0 0 0 0 0 0 0 ] 0.1003; } } phase2 { transportModel Newtonian; nu nu [ 0 2 -1 0 0 0 0 ] 1.48e-05; rho rho [ 1 -3 0 0 0 0 0 ] 1; CrossPowerLawCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; m m [ 0 0 1 0 0 0 0 ] 1; n n [ 0 0 0 0 0 0 0 ] 0; } BirdCarreauCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 0.0142515; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; k k [ 0 0 1 0 0 0 0 ] 99.6; n n [ 0 0 0 0 0 0 0 ] 0.1003; } } sigma sigma [ 1 0 -1 0 0 0 0 ] 0.07; //////////////////////////////////////////////////////////////////////////////////////// Please help!!! |
drag coeff
Hi oll of foamers I hope that you are well. I have one question: I want to calculate dragCoefficient over a cylinder with 0.025 diameter with viscoelasticFluidFoam solver. ( I use Kubuntu, OF 1-5 decv) . I add the code below in controlDict file application viscoelasticFluidFoam; startFrom latestTime; startTime 0; stopAt endTime; endTime 300; deltaT 1e-5; writeControl adjustableRunTime; writeInterval 1; purgeWrite 0; writeFormat ascii; writePrecision 6; writeCompression uncompressed; timeFormat general; timePrecision 6; graphFormat raw; runTimeModifiable yes; adjustTimeStep on; maxCo 0.8; maxDeltaT 0.001; functions ( forces { type forces; functionObjectLibs ("libforces.so"); //Lib to load outputControl runTime; outputInterval 1; patches (cylinder); // change to your patch name PName p; Uname U; rhoInf 803.87097; //Reference density for fluid CofR (0 0 0); //Origin for moment calculations } forceCoeffs { type forceCoeffs; functionObjectLibs ("libforces.so"); outputControl runTime; outputInterval 1; patches (cylinder); //change to your patch name PName p; Uname U; log true; rhoInf 803.87097; CofR (0 0 0); liftDir (0 1 0); dragDir (1 0 0); pitchAxis (0 0 0); magUInf 0.036; lRef 0.025; Aref 0.025; } ); // ************************************************** *********************** // , but when run it,after one step, this error appear : Courant Number mean: 3.24445e-07 max: 5.10534e-06 velocity magnitude: 0.000421808 deltaT = 1.43997e-05 No valid model for viscous stress calculation. From function forces::devRhoReff() in file forces/forces.C at line 306. FOAM exiting *** glibc detected *** viscoelasticFluidFoam: double free or corruption (fasttop): 0x0902a378 *** ======= Backtrace: ========= /lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x52c591] /lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0x52dde8] /lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x530ecd] /usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0x7b3741] /usr/lib/libstdc++.so.6(_ZNSs4_Rep10_M_destroyERKSaIcE+0x1d )[0x78fc2d] /usr/lib/libstdc++.so.6(_ZNSsD2Ev+0x4c)[0x79163c] /usr/lib/OpenFOAM-1.5-dev/lib/libfiniteVolume.so(_ZN4Foam4wordD1Ev+0x1d)[0xcf2efd] /lib/tls/i686/cmov/libc.so.6(+0x2f1bf)[0x4f01bf] /lib/tls/i686/cmov/libc.so.6(+0x2f22f)[0x4f022f] /usr/lib/OpenFOAM-1.5-dev/lib/libOpenFOAM.so(_ZN4Foam5error4exitEi+0x1f9)[0x3f5d2f9] /usr/lib/OpenFOAM-1.5-dev/lib/libforces.so(_ZNK4Foam6forces10devRhoReffEv+0xf54)[0x65315f4] /usr/lib/OpenFOAM-1.5-dev/lib/libforces.so(_ZNK4Foam6forces10calcForcesEv+0x32)[0x652c852] . . . ======= Memory map: ======== 00110000-0024a000 r-xp 00000000 00:10 16478 /usr/lib/OpenFOAM-1.5-dev/lib/libviscoelasticTransportModels.so 0024a000-0024b000 ---p 0013a000 00:10 16478 /usr/lib/OpenFOAM-1.5-dev/lib/libviscoelasticTransportModels.so 0024b000-0024d000 r--p 0013a000 00:10 16478 /usr/lib/OpenFOAM-1.5-dev/lib/libviscoelasticTransportModels.so 0024d000-0024e000 rw-p 0013c000 00:10 16478 /usr/lib/OpenFOAM-1.5-dev/lib/libviscoelasticTransportModels.so 0024e000-00410000 r-xp 00000000 00:10 16479 /usr/lib/OpenFOAM-1.5-dev/lib/libmeshTools.so 00410000-00413000 r--p 001c1000 00:10 16479 /usr/lib/OpenFOAM-1.5-dev/lib/libmeshTools.so 00413000-00415000 rw-p 001c4000 00:10 16479 /usr/lib/OpenFOAM-1.5-dev/lib/libmeshTools.so 00415000-00416000 rw-p 00000000 00:00 0 . . . 1) can u guide me What is the problem? 2) did I enter Aref number truly? how Lref ? ( my diameter cylinder is 0.025 & 2D) 3) If needed to complile forceCoeffs, can you tell me how complie it successfully? Thank a lot, Rasoul |
I'm not 100% sure, but I think OF1.5 did not allow you to calculate forces through this library. My advise, update to OF1.7.
K |
thanks paka for your reply,
i try to do my case with OF 1.7 and tell what happen do every one know a bout this error that appear in the error massege? "No valid model for viscous stress calculation " Rasoul best regards |
Forget about this error. Get the new version and start again.
Focusing on this error is like driving a car from 2010, but trying to fix it based on what people drove in 1936. What it seems for me, I would advise a bit of reading about programming structures and C++. Best! |
1 Attachment(s)
dear foamers, i wanna to calculate the forces formulated that was present in the attachment over a cylinder. my solver is viscoelasticFluidFoam and the forces calculation be deferent with newtonians' one, so when i wanna use forces function in OpenFOAM, this error apears :
"No valid model for viscous stress calculation " can every one help me how do it? tnx |
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Did you get the correct values of force co-efficients? I am also getting absurd values in the range of 10^5. I don't know what mistake I am doing |
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I have this error too! Did you find how to solve this problem? Thanks |
error : no valid model for viscous stress calculation
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I have this error ( no valid model for viscous stress calculation) too! Did you find how to solve this problem? Thanks |
Did you set a suitable RASmodel in constant/RASProperties (or in turbulenceProperties in newer OF versions)?
Cheers, Pascal. -- |
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I had had this problem some month ago!! So I have forgotton that. Please explain more about what you want to do. Maybe I can help you. |
Further explanation
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You are kindly asked to find the "error" and the "function added to controlDict" in the attachement. Thank you very much for your help! Kind Regards! |
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Dear Morteza Unfortunately forces function isn't written for viscoelasticFluidFoam! You should write it yourself and add it to forces code. I have done that a couple of months ago. it needs to learn C++ and openFoam language. Regards, Ali |
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RASmodel is related to turbulent flow and the model that you want to use. viscoelasticFluidFoam is written based on laminar flow. |
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----- Ali |
Sorry for the confusion I caused... it was just a shot in the dark, as I thought I remembered seeing the same error when I registered forces via a function object and had the line
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simulationType laminar;But anyway, apparently the error comes from missing implementation of forces function... Best regards, Pascal. -- |
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thank you very much for your help |
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