multigrid for numerical solution of 2d euler equa

May 16, 2002, 10:52

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

May 16, 2002, 11:12

Perhaps this discussion might interest you:

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

Best regards.

May 16, 2002, 11:15

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

May 16, 2002, 10:52	multigrid for numerical solution of 2d euler equa	#1
jim Guest Posts: n/a	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

May 16, 2002, 11:12	Re: multigrid for numerical solution of 2d euler e	#2
Francisco Guest Posts: n/a	Perhaps this discussion might interest you: http://www.cfd-online.com/Forum/main.cgi?read=21677 Best regards.

May 16, 2002, 11:15	Re: multigrid for numerical solution of 2d euler e	#3
jim Guest Posts: n/a	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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