biCGSTAB Fortran code, unstructured mesh

September 6, 2006, 11:01

I am looking for a working version of the Conjugate Gradient STABilized solver for unstructured meshes. I can't get mine to work properly.

Thanks

September 6, 2006, 11:14

There isn't a BiCGSTAB specific for unstructured meshes. BiCGSTAB is a linear solver suited for ***non symmetric*** linear systens. It doesn't matter what kind of grid the linear system come from. Regarding the Fortran routine, it can be easily found at Van der Vorst's site (take a look in http://www.math.uu.nl/people/vorst/software.html)

Regards

Renato.

September 8, 2006, 05:32

Thank you. Similarly, do any of you have a link for a fortran routine of a preconditionned (or not) conjugate gradient (CG) solver (symmetric matrices).

Regards,

Nicolas

September 12, 2006, 07:14

Try netlib.org.

September 12, 2006, 12:12

Hi Nico,

I'm sure you can easily find a PCG routine at netlib as Marcio suggested, but the PCG algorithm is so simple that you can easily implement it by yourself in 30 lines of code. In order to make the implemantion even more easy I'd suggest the use of BLAS routines (also found in netlib) to perform basic operations.

Cheers

Renato.

September 6, 2006, 11:01	biCGSTAB Fortran code, unstructured mesh	#1
Nico Guest Posts: n/a	I am looking for a working version of the Conjugate Gradient STABilized solver for unstructured meshes. I can't get mine to work properly. Thanks

September 6, 2006, 11:14	Re: biCGSTAB Fortran code, unstructured mesh	#2
Renato. Guest Posts: n/a	There isn't a BiCGSTAB specific for unstructured meshes. BiCGSTAB is a linear solver suited for *non symmetric* linear systens. It doesn't matter what kind of grid the linear system come from. Regarding the Fortran routine, it can be easily found at Van der Vorst's site (take a look in http://www.math.uu.nl/people/vorst/software.html) Regards Renato.

September 8, 2006, 05:32	Re: biCGSTAB Fortran code, unstructured mesh	#3
Nico Guest Posts: n/a	Thank you. Similarly, do any of you have a link for a fortran routine of a preconditionned (or not) conjugate gradient (CG) solver (symmetric matrices). Regards, Nicolas

September 12, 2006, 07:14	Re: biCGSTAB Fortran code, unstructured mesh	#4
Márcio Guest Posts: n/a	Try netlib.org.

September 12, 2006, 12:12	Re: biCGSTAB Fortran code, unstructured mesh	#5
Renato. Guest Posts: n/a	Hi Nico, I'm sure you can easily find a PCG routine at netlib as Marcio suggested, but the PCG algorithm is so simple that you can easily implement it by yourself in 30 lines of code. In order to make the implemantion even more easy I'd suggest the use of BLAS routines (also found in netlib) to perform basic operations. Cheers Renato.

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