CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Multigrid method for Lax-Wendroff scheme

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   June 30, 2010, 11:02
Default Multigrid method for Lax-Wendroff scheme
New Member
Join Date: Jun 2010
Location: Zurich
Posts: 1
Rep Power: 0
samira is on a distinguished road
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.

samira is offline   Reply With Quote

Old   July 2, 2010, 22:17
Jed Brown
Join Date: Mar 2009
Posts: 56
Rep Power: 10
jed is on a distinguished road
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.
jed is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Multigrid Method for Euler Equation Vidhyashankar.N Main CFD Forum 2 March 23, 2008 22:14
Multigrid method Suresh kumar Main CFD Forum 1 April 24, 2006 20:07
Pressure Possion equ.and multigrid method Tony Main CFD Forum 16 April 28, 2001 12:08
Unstructured Multigrid Method for Euler equations Jian Xia Main CFD Forum 8 December 20, 1999 13:31

All times are GMT -4. The time now is 05:29.