[FLASH-USERS] Chamber convergence LaserSlab Problem

[Ernesto Zurbriggen]

Hi Sharma!

First I have to say that I know nothing about your scenario.

On Wed, 26 Jul 2023 at 21:30, Sharma, Divyanshu Raj <sharma22 at llnl.gov>
wrote:

> Hi Flash User Group,
>
>
>
> I was trying to see how chamber size would affect the pre-plasma
> generation in the LaserSlab example problem. The problem I ran into is that
> the AMR mesh between the two simulation runs had different mesh sizes even
> though in the flash.par file they had the same lrefine_max and set to be
> equal.
>
Well, you want to change the chamber size using an AMR grid, so first you
should determine if you want to keep the maximum spatial
resolution as before or not.
You have just changed the *ymax* runtime parameter and left the rest
relevant parameters unaltered.
Keep in mind that the maximum spatial resolution (assuming squared cells)
can be determined by:

*delta y = (ymax - ymin)/[nyb*2^(lref_max - 1)] *

Note that the cells in figure B and C are squares while in figure A aren't.

Best!
Ernesto


> I attached both the files above. An example of how the two simulation runs
> look like in visit can be seen here (Fig A, B). I have also put an example
> of how I believe the mesh (Fig A) should look (Fig C). I know I can just
> create a regular cartesian mesh with i,j,k procs but that would lead to
> longer runtimes without the AMR so I was wondering if there was any manual
> way to set the different AMR sizes based on like height in the z-direction
> in an R-Z problem.
>
>
>
> Figure A. Chamber 450 target 10 mesh
>
> [image: Background pattern Description automatically generated]
>
>
>
> Figure B. Chamber 150 target 10 mesh
>
> [image: A picture containing chart Description automatically generated]
>
>
>
> Figure C. Hows Chamber 450 target 10 mesh should look like
>
>
>
>
>
>
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