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George July 18, 2005 08:54

residual in the pressure correction
 
Hi all! I am facing a problem of convergence in the pressure correction equation.The code that I am writing is about compressible viscous unsteady turbulent flow.The residual of the pressure correction is of the order of 0.001 and it never becomes less.I think the thing that I am not doing correct is the implementation of the boundary conditions.Can you please describe me with detail what they should be? (Ap*P'=SUM(Ai*Pi)+Su). The cell next to the wall has: Ai=0.0 and on the inlet and outlet is again: Aw=0.0 and Ae=0.0.

I hope there is someone out there that can help me.

Thank you in advance!

yuan July 21, 2005 21:25

Re: residual in the pressure correction
 
First contour the L1-norm of pressure coreection to see where are the locations of the maxima, then the next step. All those Ai equal to 0 at both the inlet and outlet imply both pressure values fixed. That is wrong, I guess.

George July 28, 2005 04:43

Re: residual in the pressure correction
 
Sorry for being late, but I was on holidays these days. Yes, I specify pressure at both inlet and outlet. Because the velocity is not that high (around 20-30 m/sec), I specify static pressure there. My question was if I should add some more boundary conditions next to the walls and at inlet-outlet. Thank you!


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