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Non-isothermal flow problem
Posted May 5, 2011, 10:36 p.m. EDT Low-Frequency Electromagnetics, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD) Version 4.0a 0 Replies
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The simulation is highly non-linear, the plasma is heated by electric field, and the flow has a volume force thus magnetic force.
The plasma property(density,electric conductivity ,dynamic viscosity, thermal conductivity,heat capacity at constant pressure)is the function of temperature.
I first use the automatic highly nonlinear damping solving. Comsol can not get a converged results . So I go on the iteration using a constant damping factor(0.01). After several steps, the results flew away, negative temperature appears.
I first thought it was the problem of mesh quality.But after trying changes in mesh, I still cannot solve it. When the volume force is neglected, comsol can get a converged results(first using automatic damping, then go on the iteration with a series of increasing constant damping factor: 0.1-1)
Who can help me?
Hello chen tang
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