# externalWallHeatFluxTemperature

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 July 12, 2012, 16:05 externalWallHeatFluxTemperature #1 Member   Nikunj Raithatha Join Date: Jul 2012 Location: Washington DC Posts: 47 Rep Power: 4 Hello! Does anyone have any idea about how to implements externalWallHeatFluxTemperatureboundary condition. I know the format/ syntax from here: http://foam.sourceforge.net/docs/cpp/a08597_source.html . But i am unable to figure out, in which dictionary to put this boundary condition. I tried putting it in 0/T, but it doesnt work. Please guide me how to proceed. Thanks, Nikunj.

 December 19, 2013, 11:14 #2 New Member   ae-lab VUB Join Date: Oct 2011 Posts: 17 Rep Power: 5 hi! Did you manage to figure this out? It seems to me that this BC should be in 0/T. I was trying this for a buoyantBoussinesqSimpleFoam case, the hotroom example. I tried applying th BC on the floor temp of the hotroom case (I eliminated the hot box and changed the floor temp to externalWallHeatFluxTemperature with only q (so no Ta and h, and no layers) so in 0/T floor Code: ``` { type externalWallHeatFluxTemperature; kappa fluidThermo; // fluidThermo, solidThermo or // lookup q uniform 1000; // heat flux / [W/m2] Ta uniform 300.0; // ambient temperature /[K] h uniform 10.0; // heat transfer coeff /[W/K/m2] thicknessLayers (0.1 0.2 0.3 0.4); // thickness of layer [m] kappaLayers (1 2 3 4) // thermal conductivity of // layer [W/m/K] value uniform 300.0; // initial temperature / [K] kappaName none; }``` and now I get the following error: Code: ```tarting time loop Time = 1 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 --> FOAM FATAL ERROR: lookup of turbulenceModel from objectRegistry region0 successful but it is not a turbulenceModel, it is a kEpsilon From function objectRegistry::lookupObject(const word&) const in file /home/mvdtempe/OpenFOAM/OpenFOAM-2.2.x/src/OpenFOAM/lnInclude/objectRegistryTemplates.C at line 147. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::compressible::turbulenceModel const& Foam::objectRegistry::lookupObject(Foam::word const&) const at ??:? #3 Foam::temperatureCoupledBase::kappa(Foam::Field const&) const at ??:? #4 Foam::externalWallHeatFluxTemperatureFvPatchScalarField::updateCoeffs() at ??:? #5 Foam::GeometricField::GeometricBoundaryField::updateCoeffs() at ??:? #6 Foam::fvMatrix::fvMatrix(Foam::GeometricField const&, Foam::dimensionSet const&) at ??:? #7 at ??:? #8 at ??:? #9 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #10 at ??:? Aborted (core dumped)``` Anybody an idea? Or doens't this BC work for this solver? Any examples available? Thx in advance! Maaike

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