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multigrid for numerical solution of 2d euler equa

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Old   May 16, 2002, 09:52
Default multigrid for numerical solution of 2d euler equa
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jim
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I AM PRESENTLY TRYING TO ACCELERATE THE CONVERGENCE OF MY FLOSOLVER using multigrid. I get a fairly good early acceleration for the first classic v-cycles; however afterwards, when shifting to the fine grid (prolongation using simple averaging), I start getting oscillations that become progressively large until the residue fall saturates before reaching convergence. Can anyone tell me how to avoid the problem and how to prolong the data from coarse to inorder to avoid those oscillations. I am using a finite difference based code. thanks Jim
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Old   May 16, 2002, 10:12
Default Re: multigrid for numerical solution of 2d euler e
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Francisco
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Perhaps this discussion might interest you:

http://www.cfd-online.com/Forum/main.cgi?read=21677

Best regards.
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Old   May 16, 2002, 10:15
Default Re: multigrid for numerical solution of 2d euler e
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jim
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hi there, thanks a lot about the address http://www.cfd-online.com/Forum/main.cgi?read=21677 however, i am looking for some more info about the restriction and prolongation thanks jim
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