Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Non-isothermal flow problem
Posted 5 mai 2011, 22:36 UTC−4 Low-Frequency Electromagnetics, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD) Version 4.0a 0 Replies
Please login with a confirmed email address before reporting spam
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
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.