[petsc-users] Solving problem using multigrid

[Fazlul Huq]

Thanks.
So, is it like if I run the same code using -pc_type gamg then it will use
algebraic multigrid to solve the problem?
I have hypre configured with --download-hypre.
Agin, if I want to use geometric multigrid, should I go with domain
management (DM)?
Now I am planning to go through examples with DM. Will it be a right
approach to start?

Thanks again.
Sincerely,
Huq

On Sun, Nov 18, 2018 at 4:23 PM Mark Adams <mfadams at lbl.gov> wrote:

> The manual is pretty clear on this, but your code is purely algebraic,
> that is you do not use a DM, and so you will need to use algebraic
> multigrid (AMG). So you want to look at AMG preconditioners (-pc_type gamg
> [or hypre if you configured with --download-hypre]).
>
> Mark
>
> On Sun, Nov 18, 2018 at 1:28 PM Fazlul Huq via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
>> Hello PETSc developers,
>>
>> I have solved a problem using ksp. Please find the problem in attachment
>> 1 and PETSc code for solution in attachment 2.
>> Now I need to solve the same problem using multigrid.
>> I never solved problem using multigrid. Can you please guide me about
>> steps that I should follow
>> to solve this problem using multigrid.
>>
>> Thanks.
>> Sincerely,
>> Huq
>> --
>>
>> Fazlul Huq
>> Graduate Research Assistant
>> Department of Nuclear, Plasma & Radiological Engineering (NPRE)
>> University of Illinois at Urbana-Champaign (UIUC)
>> E-mail: huq2090 at gmail.com
>>
>

-- 

Fazlul Huq
Graduate Research Assistant
Department of Nuclear, Plasma & Radiological Engineering (NPRE)
University of Illinois at Urbana-Champaign (UIUC)
E-mail: huq2090 at gmail.com
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