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How to check Heat Balance in heat transfer like mass balance for flow |
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November 13, 2008, 08:37 |
Dear Foamers hello !
Is the
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#1 |
Member
Mahendra
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Dear Foamers hello !
Is there any utility to check heat balance in heat transfer cases like we check mass balance for flow using "calcMassFlow" utiliy? Thanks, Mahendra. |
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November 21, 2008, 04:50 |
Hello People !
No replies f
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#2 |
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Mahendra
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Hello People !
No replies for the above post??? Regards, Mahendra |
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November 28, 2008, 01:21 |
hi,
At least a comment on t
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#3 |
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Mahendra
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hi,
At least a comment on the above topic????? Mahendra. |
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December 3, 2008, 05:53 |
Hi Mahendra,
There is a uti
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#4 |
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Kati Laakkonen
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Hi Mahendra,
There is a utility wallHeatFlux, but like the name says, it's only for walls, not for inlets and outlets. There was a problem with such calculation on inlet/outlet boundaries, but I don't remember exactly what - maybe something with the face normal direction? I suppose you can add an estimation to the utility using flux and enthalpy on boundaries, and try to interpret the result. Regards, Kati |
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December 3, 2008, 06:13 |
I forgot to mention the utilit
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#5 |
Member
Kati Laakkonen
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I forgot to mention the utility is written for hCombustionThermo. Replace hCombustionThermo with hThermo, if you are not using combustion models. You'll also need to add [patchi] to the if statement, i.e.
if (typeid(mesh.boundary()) == typeid(wallFvPatch)) becomes if (typeid(mesh.boundary()[patchi]) == typeid(wallFvPatch)) Then recompile. Regards, Kati |
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December 4, 2008, 02:05 |
Dear Kati,
I really appreci
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#6 |
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Mahendra
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Dear Kati,
I really appreciate for responding, I will try your suggestion and let you know about it. Thanks, Mahendra. |
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April 25, 2009, 09:57 |
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#7 | |
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Nugroho Adi
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Quote:
i modified some scripts in the wallHeatFlux post processing utilities without change the hCombustionThermo , it successed to compile but, when i changed the files, followed your instruction, i got these following errors: simulation15@user-laptop:~/OpenFOAM/OpenFOAM-1.5-dev/applications/utilities/postProcessing/wall/wallHeatFlux$ wclean simulation15@user-laptop:~/OpenFOAM/OpenFOAM-1.5-dev/applications/utilities/postProcessing/wall/wallHeatFlux$ wmake Making dependency list for source file wallHeatFlux.C SOURCE=wallHeatFlux.C ; g++ -m32 -Dlinux -DDP -Wall -Wno-strict-aliasing -Wextra -Wno-unused-parameter -Wold-style-cast -O3 -DNoRepository -ftemplate-depth-40 -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/finiteVolume/lnInclude -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/turbulenceModels/RAS -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/thermophysicalModels/specie/lnInclude -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/thermophysicalModels/combustion/lnInclude -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/thermophysicalModels/basic/lnInclude -IlnInclude -I. -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/OpenFOAM/lnInclude -I/home/simulation15/OpenFOAM/OpenFOAM-1.5-dev/src/OSspecific/Unix/lnInclude -fPIC -pthread -c $SOURCE -o Make/linuxGccDPOpt/wallHeatFlux.o In file included from wallHeatFlux.C:68: createFields.H: In function ‘int main(int, char**)’: createFields.H:1: error: type/value mismatch at argument 1 in template parameter list for ‘template<class T> class Foam::autoPtr’ createFields.H:1: error: expected a type, got ‘hThermo’ createFields.H:2: error: invalid type in declaration before ‘(’ token createFields.H:3: error: ‘template<class MixtureType> class Foam::hThermo’ used without template parameters createFields.H:6: error: base operand of ‘->’ is not a pointer createFields.H:16: error: base operand of ‘->’ is not a pointer In file included from wallHeatFlux.C:68: createFields.H:131: error: ‘thermo’ cannot be used as a function createFields.H:6: warning: unused variable ‘h’ make: *** [Make/linuxGccDPOpt/wallHeatFlux.o] Error 1 simulation15@user-laptop:~/OpenFOAM/OpenFOAM-1.5-dev/applications/utilities/postProcessing/wall/wallHeatFlux$ i change: header of wallHeatFlux.C : #include "fvCFD.H" //#include "hCombustionThermo.H" #include "hThermo.H" #include "compressible/RASModel/RASModel.H" #include "wallFvPatch.H" and createField.H becomes : autoPtr<hThermo> thermo // autoPtr<hCombustionThermo> thermo ( hThermo::New(mesh) // hCombustionThermo::New(mesh) ); const volScalarField& h = thermo->h(); is there something missed? please give me help thanks |
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May 4, 2009, 05:47 |
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#8 | |
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Bernhard Gschaider
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Bernhard |
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July 28, 2009, 04:56 |
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#9 |
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Dear Foamers,
I changed the Utility wallHeatFlux as mentioned. I´ve got no errors while compiling, but when i tried to use it on my case (impinging jet on a flat plate) i´ve got following errors: Selecting RAS turbulence model kEpsilon #0 Foam::error::printStack(Foam::Ostream&) in "/user/hi141/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/user/hi141/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so" #2 ?? in "/lib/libc.so.6" #3 Foam::compressible::RASModels::kEpsilon::kEpsilon( Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::basicThermo&) in "/user/hi141/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libcompressibleRASModels.so" #4 Foam::compressible::RASModel::adddictionaryConstru ctorToTable<Foam::compressible::RASModels::kEpsilo n>::New(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::basicThermo&) in "/user/hi141/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libcompressibleRASModels.so" #5 Foam::compressible::RASModel::New(Foam::GeometricF ield<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::basicThermo&) in "/user/hi141/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libcompressibleRASModels.so" #6 main in "/user/hi141/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/wallHeatFlux2" #7 __libc_start_main in "/lib/libc.so.6" #8 Foam::regIOobject::writeObject(Foam::IOstream::str eamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType) const in "/user/hi141/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/wallHeatFlux2" Floating point exception (core dumped) Any suggestions whats wrong? Linh |
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July 28, 2009, 09:38 |
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#10 | |
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Bernhard Gschaider
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Bernhard |
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July 28, 2009, 09:59 |
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#11 |
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Hello Bernhard,
thanks for your thoughts. my case run sucessfully and even the velocity and Temperature looks fine for me. For k and epsilon i´ve got zeroGradient at walls and outlet and for inlet and internalfield a fixed Value. (k=0.19 and epsilon= 8). That seems right for me. Any other suggestions why it doesen't work? Linh |
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July 28, 2009, 14:03 |
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#12 | |
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Bernhard Gschaider
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February 8, 2012, 06:28 |
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#13 |
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johannes k.
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ik now, its quite an old thread..but one question:
i've got quite a similar problem, my machine says: Starting time loop Time = 1 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.019224, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.0170779, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 0.0153836, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.514064, Final residual = 0.00679162, No Iterations 1 DICPCG: Solving for p, Initial residual = 1, Final residual = 9.81448e-05, No Iterations 558 DICPCG: Solving for p, Initial residual = 0.205988, Final residual = 2.04897e-05, No Iterations 142 DICPCG: Solving for p, Initial residual = 0.0258002, Final residual = 2.46229e-06, No Iterations 454 time step continuity errors : sum local = 0.0268867, global = 6.52206e-05, cumulative = 6.52206e-05 rho max/min : 2 2 DILUPBiCG: Solving for omega, Initial residual = 0.999982, Final residual = 0.0668744, No Iterations 2 bounding omega, min: -1369.7 max: 7.94188e+07 average: 420.946 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.0661276, No Iterations 1 ExecutionTime = 743.84 s ClockTime = 751 s Time = 2 DILUPBiCG: Solving for Ux, Initial residual = 0.147725, Final residual = 0.0122156, No Iterations 3 DILUPBiCG: Solving for Uy, Initial residual = 0.285303, Final residual = 0.00314927, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.361735, Final residual = 0.0197595, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.426434, Final residual = 0.0386005, No Iterations 2 DICPCG: Solving for p, Initial residual = 0.999999, Final residual = 23.1811, No Iterations 1001 DICPCG: Solving for p, Initial residual = 0.833482, Final residual = 0.00709432, No Iterations 1001 DICPCG: Solving for p, Initial residual = 0.847285, Final residual = 0.0412215, No Iterations 1001 time step continuity errors : sum local = 9009.91, global = -26.1803, cumulative = -26.1803 rho max/min : 2 2 DILUPBiCG: Solving for omega, Initial residual = 0.99807, Final residual = 0.0959366, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.724922, Final residual = 0.0287185, No Iterations 1 ExecutionTime = 2472.43 s ClockTime = 2487 s Time = 3 DILUPBiCG: Solving for Ux, Initial residual = 0.300673, Final residual = 0.0115287, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.449886, Final residual = 0.0417425, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.446248, Final residual = 0.0391038, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.397656, Final residual = 0.0197622, No Iterations 19 DICPCG: Solving for p, Initial residual = 0.949759, Final residual = 0.000545524, No Iterations 1001 DICPCG: Solving for p, Initial residual = 0.0981401, Final residual = 9.80824e-06, No Iterations 908 DICPCG: Solving for p, Initial residual = 0.121937, Final residual = 1.19824e-05, No Iterations 748 time step continuity errors : sum local = 5.62326, global = -0.28192, cumulative = -26.4622 rho max/min : 2 0.001 DILUPBiCG: Solving for omega, Initial residual = 0.494972, Final residual = 0.038501, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.551354, Final residual = 0.0213688, No Iterations 1 ExecutionTime = 4078.91 s ClockTime = 4101 s Time = 4 DILUPBiCG: Solving for Ux, Initial residual = 0.676072, Final residual = 0.0333149, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.624142, Final residual = 0.0401927, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.605495, Final residual = 0.0382899, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.0459921, No Iterations 2 #0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 in "/lib/libc.so.6" #3 Foam::hPsiThermo<Foam:ureMixture<Foam::sutherlan dTransport<Foam::specieThermo<Foam::hConstThermo<F oam:erfectGas> > > > >::calculate() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #4 Foam::hPsiThermo<Foam:ureMixture<Foam::sutherlan dTransport<Foam::specieThermo<Foam::hConstThermo<F oam:erfectGas> > > > >::correct() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #5 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/rhoSimpleFoam" #6 __libc_start_main in "/lib/libc.so.6" #7 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/rhoSimpleFoam" Floating point exception (core dumped) but i've checked all my variables...none is zero! You're talking about the debug mode, can anyone please help me and tell me what i have to do to run the solver (rhosimplefoam) in debug mode?? Would be great!! |
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February 8, 2012, 09:02 |
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#14 |
Senior Member
Olivier
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hello,
I you gess your rho min was too small, or even negative. (see you log). Try relax for T, and check if all is correct with your thermo setting. regards, olivier |
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February 8, 2012, 10:58 |
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#15 | |
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johannes k.
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Quote:
Ok, thanks for helping, but......what does all that mean?my rho min is 0.001..is that too small?? and what about relax for T, where do i have to do these settings. and the thermo settings? where do i find them? what do i have to write there?? But again...thanks much for help |
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February 8, 2012, 11:19 |
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#16 |
Senior Member
Olivier
Join Date: Jun 2009
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in system/fvSolution, check if you have set rhoMin and rhoMax.
And if the solver still crash, check (always in fvSolution) the relaxationFactors for h and rho: try a lower value at first, and when all goes well, you can reset to the initial value on the fly. regards, olivier |
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