[petsc-users] Coupling HYPRE with PETSc for local grid refinement

[Alan]

Dear Dr. Brown,
     I was trying to use PETSc to mimic something like Chombo. The 
figure in this website represents my thought very well.  
(https://commons.lbl.gov/display/chombo/Chombo+-+Software+for+Adaptive+Solutions+of+Partial+Differential+Equations). 
My code simulates a flow over a objective, i.e. 2D cylinder. Finer 
resolution is needed near the objective. I can manually define where the 
finer resolution is needed.
     BTW, I wonder if there is any examples for the Vec/Mat interface. 
Also, is there any examples for PETSc for GPU.

thanks,
Alan
> On Sat, Oct 6, 2012 at 10:47 PM, Alan <zhenglun.wei at gmail.com 
> <mailto:zhenglun.wei at gmail.com>> wrote:
>
>     Dear Dr. Brown,
>          Thanks for your reply and sorry for confusing you.
>          I was trying to ask if there is an alternative way that I can
>     replace the DMDACreate3d in /src/ksp/ksp/example/tutorials/ex45.c
>     with something from outside of the PETSc (i.e. HYPRE).
>     DMDACreate3d generates a 3D Cartesian grid with uniform grid size.
>     However, I'm trying to import a local refined grid from outside of
>     the PETSc (i.e. HYPRE) to replace this 3D Cartesian grid with
>     unifrom grid size. Is there any examples for me to refer?
>
>
> Do we have automatic support for this? No. You could of course just 
> use the Vec/Mat interface, but
> it sounds like a lot of coding on your part. I plan to do this 
> eventually by specifying the data layout over
> the grid using PetscSection. However, the really important question 
> here is, what do you need from the
> grid? If you don't need topological queries, just make the Vec/Mat and 
> be done with it. If you do (which
> I imagine), then you need to be specific about what you need.
>
>    Matt
>
>     thanks,
>     Alan
>
>>     Run any example with -pc_type hypre. I'm not sure what you're
>>     asking for.
>>
>>     On Sat, Oct 6, 2012 at 8:04 PM, Alan <zhenglun.wei at gmail.com
>>     <mailto:zhenglun.wei at gmail.com>> wrote:
>>
>>         Dear Folks,
>>         I hope you're having a nice day.
>>         I'm trying to couple HYPRE with PETSc in order to use PETSc
>>         solvers to
>>         obtain solutions (Poisson Equation) with local refined grid
>>         from HYPRE.
>>         Is there any examples in PETSc that I can refer? or is there any
>>         examples in PETSc which introduce such a way that the Matrix
>>         is imported
>>         from external software rather than generated by PETSc.
>>
>>         thanks,
>>         Alan
>>
>>
>
>
>
>
> -- 
> What most experimenters take for granted before they begin their 
> experiments is infinitely more interesting than any results to which 
> their experiments lead.
> -- Norbert Wiener

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