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Strange temperatur flow in buoyantBoussinesqSimpleFoam with viscous heating |
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June 30, 2012, 09:11 |
Strange temperatur flow in buoyantBoussinesqSimpleFoam with viscous heating
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#1 |
New Member
Join Date: Dec 2011
Posts: 12
Rep Power: 14 |
Hi all,
i need your help, please. I have added viscous heating to buoyantBoussinesqSimpleFoam. Everythink works fine, but now i have a strange heat flow in my testcase. I have a modell, similar to the driven cavity case, but with the upper and the lower wall running against each other. Both moving walls have fixed temperatur value of 300K. just to get a steady state solution. The internal field is also at 300K. here is what i get from my solver, slice through the cavity and a plot over line from top to bottom: Here is my code for my TEqn.H: Code:
{ kappat = turbulence->nut()/Prt; kappat.correctBoundaryConditions(); volScalarField kappaEff("kappaEff", turbulence->nu()/Pr + kappat); fvScalarMatrix TEqn ( fvm::div(phi, T) - fvm::Sp(fvc::div(phi), T) - fvm::laplacian(kappaEff, T) - ((U & fvc::grad(p)) / Cp) - (((turbulence->nuEff() / Cp) * (fvc::grad(U) + fvc::grad(U)().T())) && fvc::grad(U)) ); TEqn.relax(); TEqn.solve(); rhok = 1.0 - beta*(T - TRef); } I hope you can help me. thanks a lot! Greetings Sebastian |
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June 30, 2012, 12:15 |
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#2 |
Senior Member
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
Posts: 1,266
Blog Entries: 1
Rep Power: 24 |
you add a "viscous heating" term, so it maybe not unphysical at all, because your mechanical energy turn into heat by that term
as "grad U" is higher near moving wall then the heat is higher there |
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