[FLASH-USERS] [EXTERNAL] Re: Use of implicit diffusion solver with AMR

[Madhav Nagori]

Thank you very much for your reply. I have been trying to use the implicit
diffusion with AMR, but I am not able to run it. I am getting the following
error and then my solution diverges and blows up.

*perfmon: ran out of space for timer, "PFFT_Init", cannot time this timer
with perfmon*

What I did was that I added the multigrid solver (REQUESTS
Grid/GridSolvers/Multigrid/PfftTopLevelSolve/) to my Config file and added
the corresponding runtime parameters in my *.par file* according to the
FLASH manual. Is there anything else that needs to be added ? Kindly let me
know.

P.S: I am using the split solver which means that the time advancement code
is solved by Thomas Algorithm. Would this have any connection with this
error?

Thank you for your time.

On Wed, Apr 5, 2023 at 7:09 PM Hansen, Eddie <ehansen at pas.rochester.edu>
wrote:

> The user guide is referring to implicit magnetic diffusion. That one is
> not yet supported for AMR. Currently, the implicit diffusion solvers with
> AMR are for thermal conduction and radiation only.
>
> ******************************************
> Eddie Hansen | Research Scientist
> Flash Center for Computational Science
> Dept. of Physics and Astronomy
> University of Rochester, Rochester, NY
> Cell 607-341-6126 | flash.rochester.edu
> (he / him / his)
> ******************************************
> ------------------------------
> *From:* flash-users <flash-users-bounces at flash.rochester.edu> on behalf
> of Madhav Nagori <mnagori at uncc.edu>
> *Sent:* Wednesday, April 5, 2023 10:31:48 AM
> *To:* flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
> *Subject:* [FLASH-USERS] Use of implicit diffusion solver with AMR
>
> Hello FLASH users and Development Team,
>
> I want to use the implicit diffusion solver for some very high resolution
> cases of cell size 512*512*2048. For such high resolution, I want to use
> AMR as the uniform mesh will take months to run.
>
> The user guide tells that the paramesh is not available to the implicit
> diffusion solver. Is it possible to modify the code so that I can run with
> AMR?
>
> P.S: I am using mass diffusion, viscosity diffusion and thermal diffusion
> in my simulation. I tried using the explicit diffusion solver (Flux Based
> Diffusion) with AMR, but that gave wrong results. However, the implicit
> solver is providing the correct results.
>
> Please let me know.
>
> Thank You
>
> --
> Best Regards,
>
> Madhav Nagori
>
> PhD Candidate | Laboratory for Multiscale Computational Fluid Dynamics
> Department of Mechanical Engineering and Engineering Sciences
> University of North Carolina at Charlotte
> Office: Duke 273, 9330 Robert D. Snyder Rd, Charlotte, NC 28262, USA
> Email: mnagori at uncc.edu
> LinkedIn: www.linkedin.com/in/madhav-nagori
>


-- 
Best Regards,

Madhav Nagori

PhD Candidate | Laboratory for Multiscale Computational Fluid Dynamics
Department of Mechanical Engineering and Engineering Sciences
University of North Carolina at Charlotte
Office: Duke 273, 9330 Robert D. Snyder Rd, Charlotte, NC 28262, USA
Email: mnagori at uncc.edu
LinkedIn: www.linkedin.com/in/madhav-nagori
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