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Using General PDE interface to solve Navier-Stokes equation
Posted 6 sept. 2016, 14:42 UTC−4 0 Replies
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I am working on a project that needs me to use a compressible Navier Stokes solver with bulk viscosity involved. Since there is no such option in the COMSOL fluid model, I believe using PDE interface to create my own Navier-Stokes equation is the only option I left. So I want to start from generating incompressible N-S equation first.
There were several discussion talked about this in the forum.
www.comsol.com/community/forums/general/thread/22187/#p273132
www.comsol.com/community/forums/general/thread/38038/
After following their instruction I have no problem to set up 2 momentum equation PDE for "u" and "v", 1 continuity equation PDE with the pressure defined as the dependent variable and use linear Lagrange shape function.
However, these setting only works for a flow with velocity inlet boundary condition. If I want to simulate a pressure driven pipe flow with pressure inlet, which means setting inlet Dirichlet boundary conditions at that continuity equation PDE ( pressure defined ). the flow pattern is incorrect.
I will be very appreciated if someone can give me some instruction on this problem.
Best
Di Shen
Hello Di Shen
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