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October 20, 2015, 10:30 |
Diffusion number in chtMultiRegionFoam
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#1 |
New Member
Adrien
Join Date: Apr 2013
Posts: 2
Rep Power: 0 |
Hello OpenFoam Community,
I am using the chtMultiRegionFoam solver to simulate the heat transfer between two solid layers with different materials properties (no fluid). I have a question concerning the Diffusion number definition and its use to control the time step adjustment in the chtMultiRegionSolver. Looking at the source file, I found that unlike the Courant number, the Diffusion Number has dimension. It has a length dimension and is defined as DiNum = thermal diffusivity * timeStep / Length As a consequence, I am a bit confused when trying to give a target value for this number for the adjustTimeStep option. In the tutorials the maximum value (maxDi) is set to 10. Is this valid for any case ? Does it depends on the mesh size? Thank you very much for your help regarding this matter, Adrien |
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