[FLASH-USERS] Problem with hydro

[Sijoy C D]

Dear Chang,

It might be due to the pressure differences at time t=0 itself due to
specified initial conditions for the materials (through EOS). Since there
is no pressure equilibrium, near the material interfaces, the materials may
get compressed or expanded depending on the magnitude of the pressure diff.
This causes temp drop in the expanded material and may increase the temp in
the compressed material (ideally). For HEDP problems, mostly, these slight
temp differences may be ignored (of-course depending on the problem).

Regards
--Sijoy C D





On Fri, Dec 5, 2014 at 12:55 AM, pchang <pchang at lle.rochester.edu> wrote:

> Hi all,
> I am using Flash to simulate the HEDP problem. Recently, I had following
> tests:
> Start with the LaserSlab example. Turn off the radiation, heat exchange,
> conduction, laser by setting:
> rt_useMGD=.false.
> useOpacity=.false.
> useEnergyDeposition=.false.
> ed_useLaserIO=.false.
> useDiffuse=.false.
> useConductivity=.false.
> diff_useEleCond=.false.
> useHeatexchange=.false.
>
> I kept the hydro to be on by setting:
> useHydro=.true.
>
> Since there was no energy in/out, I expected nothing would change in the
> simulation. However, the temperature in the low density gas right next to
> the target dropped!
> If I turned off the hydro by setting useHydro=.false. , the temperature
> did not change as expected. I tried different combinations of turning on
> and off of different physics. I found it's mainly from the hydro.
> Does anyone see the same problem?
>
> Thank you,
>
> Po-Yu
>
> --
> Po-Yu Chang
>
> Postdoctoral Associate
> Mechanical Engineering,
> Fusion Science Center,
> Laboratory for Laser Energetics
> University of Rochester
> 250 East River Road
> Rochester, New York 14623
> Phone: (585) 273-5179
> FAX: (585) 275-5960
> pchang at lle.rochester.edu
>
>
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