buoyantBoussinesqSimpleFoam and kappat
HI OF Users,
I am simulating the flow over a hot board. I have done various Simulations with rhoSimpleFoam and buoyantSimpleFoam. Now I want to start a Simulation with the solver buoyantBoussinesqSimpleFoam. For that I have to specify the kappat, the 'kinematic turbulent thermal conductivity'.
But I canīt find any information of how to calculate the initial values and which BC to set.
Is there any Information for that?
I found the following definition for the turbulent heat conductivity. It is the product of the heat capacity and the turbulent kinematic viscosity of your considered fluid. I found that in the following book (you can find it in google books): Innovative Food Processing Technologies: Advances in Multiphysics Simulation( Kai Knoerzer,Pablo Juliano,Peter Roupas).
But I think you don't need to specify it exactly. For the walls you have a wall function and for the "Inlet" you can use the "calculated" boundary conditon. For the "Outlet" it is zeroGradient.
I hope this helps.
Thanks for the hint. I have now for kappat:
All Walls: kappatJayatillekeWallFunction;
and some empty and symmetry patches.
But my solition is aborting in the first iteration giving me this message:
Thanks for any hints
I have uploaded the whole case but I had to delete U p files. I have adopted them for initialization from another simulation so they are to large...
You have to define a reference for the density for the buoyantpressure boundary conditions.
By the way, for the inlet it is better to define the pressure as zerogradient. Otherwise your problem is overdetermined.
I hope this will fix the problem. Good luck for your simulation!
thank you very much for going throw my case! And for this valuable solution. Indeed it fixed my simulation. :cool:
But my pressure inlet is already zeroGradient. Do you mean the inlet for p_rgh?
What about LES? Is it still the same way to set up boundary condition for kappat as you said? Or should I do it the way as nuSgs in tutorial cases, that is, to set all boundaries zeroGradient?
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