[FLASH-USERS] [EXTERNAL] USM Advection-only Test

[Eddie Hansen]

Maybe you could edit whatever EOS routine you're using to artificially set
the pressure(s) to some constant value. Not very physical, but it would
presumably get rid of motion due to pressure gradients.


On Wed, Jun 3, 2020, 3:15 PM Ryan Farber <rjfarber at umich.edu> wrote:

> Hi flash-users,
>
> I'm working on a (2D) test problem in FLASH4.6.2 in which I initialize a
> gaussian of gas energy density on an otherwise uniform medium with
> vx=vy=1.0.
>
> I refine on gas energy density with lrefine_min = 6 and lrefine_max = 9
> and update refinement every two steps (nref=2).
>
> The purpose of the test is to confirm conservation of mass, momentum, and
> energy with AMR (and additionally to confirm AMR
> refinement/derefinement works correctly).
>
> I have successfully run the problem; however, the gaussian spreads out
> presumably due to the pressure gradient between the blob and the ambient
> medium.
>
> I've been perusing hy_uhd_: unsplit; unsplitUpdate; and now getFaceFlux
> but I haven't yet seen how I can turn off the inclusion of pressure
> gradients in the solution.
>
> If you have a hint, I'd welcome it :)
>
> Best,
> --------
> Ryan Farber
> PhD Candidate
> University of Michigan, Ann Arbor
>
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