Boundary conditions for heat transfer between a hot plate and the ambient air
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I have seen this thread which is about natural convection between a hot plate and the ambient as well, but I can't seem to find the problem in my case. It is attached (execute blockMesh -region air first).
My goal is to simulate a hot plate in a very large room. The plate is square, so I defined a mesh which models only 1/4 of the plate (at the bottom of the room) and the surrounding air, with two symmetry planes. The plate and the floor are walls, so I use U: no-slip p_rgh: fixedFluxPressure p: calculated T: on the plate is fixed to 400 K, on the floor fixed to 300 K. The ambient air has these BCs: U: zeroGradient p_rgh: fixedFluxPressure p: calculated T: fixed to 300 K. Are these reasonable? I use chtMultiRegion(Simple)Foam because I want to refine the hot plate model later. Currently the case just contains one fluid region "air". Both chtMultiRegionSimpleFoam and chtMultiRegionFoam abort after a few time steps, with the temperature diverging: Code:
Solving for fluid region air This also happens when I set the plate's temperature to 300 K, i.e. no temperature difference between the plate and the ambient air. What is wrong here? I am using OF2.4.0 Best regards Christoph |
I enabled turbulence (k-epsilon, as in the tutorials) and now it's running fine. Is that a common problem with these setups (natural convection, chtMultiRegion solvers)?
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chtMultiRegionFoam
hi foamers,
i am modelling flows through pipes (hot and cold), with a heatexchanger coupling the hot to the cold (chtmultiregionfoam). I do not know which files to specify in my heatchanger folder, in the constant folder. example: constant: polymesh coldwater - g, radiation pro, ras pro, thermophysical pro, turbulence pro heatexchanger - ???? I am new to openfoam and have checked out various tutorials but couldn't find an example to give me an idea. thanks... |
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