[FLASH-USERS] How to achieve static pressure balance in FLASH

[Alan Calder]

Hi Yang,

Typically one writes a routine that integrates the equation of HSE as you
wrote and constructs the background pressure accordingly. When I ran the
R-T problem in ancient days, the setup would be given the ratio of
densities at the interface and a pressure there, then integrate HSE up and
down to get the pressure that would provide balance.

I *think* the distribution of Flash comes with a problem called RTFlame
that is for a R-T unstable flame. You might have a look at that as a start.

Hope this helps!

Alan



On Sun, Aug 13, 2023 at 11:36 AM YGW <gwyang991314 at 163.com> wrote:

> Hi Flash User Group,
>
> I am trying to set up a classic RT instability case. The upper layer of
> material is CH, and the lower layer is He. After adding constant gravity,
> the interface will move. How should I set a static pressure balance?  How
> to reflect the static pressure balance formula（dp/dz=-\rho g） in FLASH to
> enable FLASH to understand the pressure (P) I set?
>
>
> Thank you in advance,
>
> Yang
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-- 
Alan C. Calder
Department of Physics and Astronomy
State University of New York at Stony Brook
Stony Brook, NY 11794-3800

office: ESS 438
phone:  (631) 632-1176
fax:  (631) 632-1745
web: http://www.astro.sunysb.edu/acalder
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