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August 29, 2001, 03:12 |
Preconditioner
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#1 |
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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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August 31, 2001, 15:47 |
Re: Preconditioner
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#2 |
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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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August 31, 2001, 17:58 |
Re: Preconditioner
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#3 |
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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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