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Nailya August 29, 2001 03:12

Preconditioner
 
Hi, I'm Nailya. I solve Navier-Stokes equations in implicit way using finite difference method on unstructured meshes, TVD method, Newton's method. The obtained linearized system I try to solve using GMRES method. The problem is that the matrix of system is very ill-conditioned. I need in a good preconditioner. How can I obtain it?

David Sun August 31, 2001 15:47

Re: Preconditioner
 
You can try to find some packages such as QMRPACK, SPARKSKIT from netlib and there are some preconditioning GMRES built in...

Chuck Leakeas August 31, 2001 17:58

Re: Preconditioner
 
Nailya, Why is your system of equations so ill-conditioned? Make sure you assemble your matrix correctly. You can start trying to precondition your system of equations using a Jacobi Preconditioner.

Chuck


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