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Forum: Main CFD Forum

January 5, 2024, 12:49

Replies: 4

Linear solver choice for inner iterations of implicit CFD solvers

Views: 400

Posted By aerosayan

Answering my own question, since Eigen is getting...

Answering my own question, since Eigen is getting more popular, and maybe it will help someone in future ...

Use DIRECT solvers *as much as possible*, for development, debugging, and testing.
...

Forum: Main CFD Forum

December 23, 2023, 01:34

Replies: 4

Linear solver choice for inner iterations of implicit CFD solvers

Views: 400

Posted By aerosayan

Thanks Andy, Eigen3 is good enough for...

Thanks Andy,

Eigen3 is good enough for experimental codes, and it's the one I know, so I don't want to setup more complicated solvers like PETSc right now.

I know how to implement Gauss-Siedel,...

Forum: Main CFD Forum

December 22, 2023, 09:14

Replies: 4

Linear solver choice for inner iterations of implicit CFD solvers

Views: 400

Posted By aerosayan

Currently I'm thinking of just using BiCGSTAB or...

Currently I'm thinking of just using BiCGSTAB or GMRES to "partially" solve it.

One of Venkatakrishnan and Mavriplis's papers from 1993 recommend that since the linear system is not accurate to...

Forum: Main CFD Forum

December 22, 2023, 06:46

Replies: 4

Linear solver choice for inner iterations of implicit CFD solvers

Views: 400

Posted By aerosayan

Linear solver choice for inner iterations of implicit CFD solvers

Hello everyone,

I'm trying to implement this implicit solver : https://doi.org/10.1016/j.jcp.2018.04.005

They use an approximate Jacobian to linearize the system, then relax it using 10 inner...

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