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-   -   SU2 2.0.8 stops with the option LINEAR_SOLVER=LU_SGS (http://www.cfd-online.com/Forums/su2/124863-su2-2-0-8-stops-option-linear_solver-lu_sgs.html)

taxalian October 14, 2013 16:20

SU2 2.0.8 stops with the option LINEAR_SOLVER=LU_SGS
 
I want to run the simulation by using the following parameter in config file with SU2 2.0.8 release:

LINEAR_SOLVER= LU_SGS, the code stop immediately by giving the following error:

ERROR: Cannot find value LU_SGS in given map.
Please check the name of the variable in the config file.



LINEAR_SOLVER= BCGSTAB, the code runs normally.

The question here is that is the LU_SGS option will not be available in the next regular release or its a bug in this developer release.

jentink October 15, 2013 08:10

LU_SGS does work for pre-conditioner option (LINEAR_SOLVER_PREC)

copeland October 15, 2013 16:34

Hi Taxalian,

SU2 now uses Krylov subspace methods to solve the sparse linear system in SU2_CFD. As Tom said, you can still use LU_SGS as a pre-conditioner for the linear system.

Try:
LINEAR_SOLVER= FGMRES
-or-
LINEAR_SOLVER= BCGSTAB

These Krylov methods are powerful and have consistently shown better performance than LU_SGS for the developer test cases. At this time, there are no plans to re-implement LU_SGS as a primary linear solver within SU2.


Regards,
Sean

taxalian October 15, 2013 16:53

Thanks Tom and Copeland for your reply, i also figured it out about these options in the config_template file available with the SU2 2.0.8 release.


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