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Re: [ff3d-users] Extremely slow convergence for certain domains


From: Stephane Del Pino
Subject: Re: [ff3d-users] Extremely slow convergence for certain domains
Date: Mon, 23 Aug 2010 12:48:08 +0200
User-agent: KMail/1.13.5 (Linux/2.6.32-5-amd64; KDE/4.4.5; x86_64; ; )

Dear Juzar.

I am afraid there are no good preconditionners in ff3d for non "symmetric and 
positive definite" linear problems. Also the shape of the domain (very 
stretched) and the aspect ratio of the cells in the mesh do not help.

Sorry but I have no immediate solution to help you.

Also, I founded something strange in your data file. You impose "dnu(u)" on the 
internal boundary 'T'. This corresponds up to the sign to the jump of the 
normal derivative across 'T'. Is that what you meant?

Best regards,
St├ęphane.



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