Xujun Zhao <xzhao99@...> writes:
>
> Hi folks,
>
> I am trying to use the user-defined preconditioner for my Stokes problem.
I
> first add my preconditioning matrix by
> system.add_matrix("Preconditioner");
>
> then assemble this matrix by a subroutine. My question is how I can tell
> libmesh solver to use this preconditioner when the problem is being
solved.
> I looked at ImplicitProblem::solve(), in which the preconditioner is
> delivered through
> linear_solver
>
<http://libmesh.github.io/doxygen/classlibMesh_1_1LinearImplicitSystem.html
#a7cc68891fa9f44ded49b9b84c057cb32>->solve
> (*matrix
>
<http://libmesh.github.io/doxygen/classlibMesh_1_1ImplicitSystem.html#a549b
d875b4fc99cbd5d1f7ba169feca7>,
> this->request_matrix
>
<http://libmesh.github.io/doxygen/classlibMesh_1_1ImplicitSystem.html#a0f49
7ae21ddc216ca57b4cbdb7429f67>
> ("Preconditioner"), *solution
>
<http://libmesh.github.io/doxygen/classlibMesh_1_1System.html#ae1846816118b
13d942071124f8a74808>,
> *rhs
>
<http://libmesh.github.io/doxygen/classlibMesh_1_1ExplicitSystem.html#a98fd
e3a02d1256dbc31891c88986bddc>,
> tol, maxits);
>
> However, from the output, I can still see the KSP type is gmres and PC
type
> is block jacobi (by default in PETSc). It seems to me that the solver
> applied two PCs, one is bjacobi, and the other is the user-defined??? How
> can I fixed this and only use my own PC?
>
> Should I use -pc_type none? If so, will my own PC matrix be neglected by
> the solver?
>
> Thanks.
> Xujun
> -------------------------------------------------------------------------
-----
> Dive into the World of Parallel Programming The Go Parallel Website,
sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub
for all
> things parallel software development, from weekly thought leadership
blogs to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/
>
Hi Xujun Zhao,
were you be able to solve this? I would like to use an user defined
preconditioner, as well.
If you were able to do that, could you please give me an hint?
Thanks,
Andrea
------------------------------------------------------------------------------
Mobile security can be enabling, not merely restricting. Employees who
bring their own devices (BYOD) to work are irked by the imposition of MDM
restrictions. Mobile Device Manager Plus allows you to control only the
apps on BYO-devices by containerizing them, leaving personal data untouched!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
_______________________________________________
Libmesh-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/libmesh-users
