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-   -   Preconditioning & eigenvalues (http://www.cfd-online.com/Forums/main/886-preconditioning-eigenvalues.html)

Pedro Molina-Morales June 4, 1999 22:44

Preconditioning & eigenvalues
 
I'm trying to apply the preconditioning method in Choi & Merkles's AIAA 84-1638 paper to my 2-D implicit code. I'm having trouble trying to calculate the eigenvalues of the modified (preconditioned) system. I've used Matlab to calculate them, but the computer just yields a huge amount of variables. Is there a fast way to obtain the eigenvalues that you may know? Is it usually done by hand? I shall very much appreciate your help.


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