[FLASH-USERS] Expansion of Target

[Andy Sha Liao]

Scott,


The target is not expanding nearly as much on the rear side as it is on the
front. If the problem is as you described, then the target should expand
from both vacuum interfaces, but only the irradiated side is affected.


Andy

On Tue, Feb 15, 2022 at 2:33 PM Scott Feister <sfeister at gmail.com> wrote:

> Hi Benbayer,
>
> This is a well-known issue in our community, for those studying
> laser-plasma interactions. FLASH treats everything as a plasma. There are
> no chemical bonds (e.g. solids physics, liquids physics) which are in the
> code and would physically prevent such expansion. One workaround can be
> explained better by others, is to "freeze" the hydrodynamics on cells who
> do not exceed a certain temperature. We can do that using a variable in
> flash called "BDRY". I will leave it to others to elaborate.
>
> As a starting point, search through our past forum discussions for "BDRY".
> For example, here's a good syntax in Google to search the entire FLASH
> website:
> "BDRY site:https://flash.rochester.edu/"
>
>
> https://www.google.com/search?q=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&oq=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&aqs=chrome..69i57.4755j0j4&sourceid=chrome&ie=UTF-8
>
> Hope this helps!
>
> -Scott
>
> On Tue, Feb 15, 2022 at 4:14 AM kouider benbayer <
> benbayer.kouider at gmail.com> wrote:
>
>> Hi all.
>> I have observed a problem of expansion of the whole target  over time
>> instead of expansion at the point where the laser is focused.
>> I am attaching the pseudo plot of density which shows the expansion of
>> the target.
>> Can anyone have a solution to this issue?
>> Best regards.
>> Benbayer.
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