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Old   August 29, 2001, 03:12
Default Preconditioner
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Nailya
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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?
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Old   August 31, 2001, 15:47
Default Re: Preconditioner
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David Sun
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You can try to find some packages such as QMRPACK, SPARKSKIT from netlib and there are some preconditioning GMRES built in...
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Old   August 31, 2001, 17:58
Default Re: Preconditioner
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Chuck Leakeas
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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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