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Forum: Main CFD Forum

July 31, 2013, 16:41

Replies: 12

Good Starting Guesses for Faster Iterative Solution of Unsteady Simulations

Views: 1,316

Posted By rmh26

I meant that the most time consuming part of the...

I meant that the most time consuming part of the problem is the Poisson equation for the pressure. Because multgrid methods were design for elliptic problems it is often worth the effort to apply a...

Forum: Main CFD Forum

July 31, 2013, 15:53

Replies: 12

Good Starting Guesses for Faster Iterative Solution of Unsteady Simulations

Views: 1,316

Posted By rmh26

I would try using a MGCG over just a plain MG...

I would try using a MGCG over just a plain MG method. If you have discontinous coefficients or sharp forcing terms then plain MG can sometimes fail to converge.

I'm not sure if the resulting...

Forum: Main CFD Forum

July 30, 2013, 11:58

Replies: 12

Good Starting Guesses for Faster Iterative Solution of Unsteady Simulations

Views: 1,316

Posted By rmh26

A multigrid preconditioner will reduce the number...

A multigrid preconditioner will reduce the number of iterations by at least an order of magnitude. Not familiar with the exact fractional step method, but I am using a fraction step method and it...

Forum: Main CFD Forum

July 29, 2013, 19:46

Replies: 12

Good Starting Guesses for Faster Iterative Solution of Unsteady Simulations

Views: 1,316

Posted By rmh26

Are you using a preconditioner? That will improve...

Are you using a preconditioner? That will improve your performance much more than the initial guess. I am using a multigrid preconditioner and having a good initial guess helps a little but is...

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