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samira June 30, 2010 11:02

Multigrid method for Lax-Wendroff scheme
Hi everyone,

I am working with an in-house compressible Navier-Stokes solver which uses the one-step second order Ni's lax-Wendroff scheme.

For accelerating the convergence, I am trying to implement the multigrid in the solver. Actually, in Lax-Wendroff method, because of the coupled descreatization of time and space, the algorithm is a little bit different from explicit multistage codes. It is actually called "multiple-grid" in Ni's first paper.

I just wanted to find out whether anybody have any experience or information about it because it does not seem to be working in my code.

I know this topic has been closed almost 30 years ago and that makes it even more difficult because I can not find anybody alive in the authors to contact.


jed July 2, 2010 22:17

You can write you discretization in semi-discrete form (discretize only over space, not time). This is greatly preferable from a software perspective since you can use any SSP method for the forward integrator, and can naturally solve for steady states. Once you have a semi-discrete form, you can use pseudotransient continuation ( in Newton-Krylov or nonlinear multigrid form to solve for steady state.

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