[FLASH-USERS] Expansion of Target

[Marissa B. P. Adams]

Also, another thought w.r.t Andy and Scott's discussion: expansion will
depend on the plasma variables of the vacuum/gas above the target, which
the illumination with the laser will make different from the back side due
to radiation.

(Apologies to Yingchao, Andy and Benbayer for the repeat email)

On Wed, Feb 16, 2022 at 2:48 PM Marissa B. P. Adams <
madams at pas.rochester.edu> wrote:

> It looks to me to be a result of too much numerical diffusion. What CFL is
> being used? What order? Solver? Send your *flash.par* Benbayer when you
> get the chance.
>
> I am also curious if the expansion looks the same if you multiply it only
> by the target species mass fraction for the same pseudo-color scale of
> density (same min/max).
>
> Best,
> Marissa
>
> On Wed, Feb 16, 2022 at 2:41 PM Andy Sha Liao <andy at f.energy> wrote:
>
>> 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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>
>
> --
> %---------------------------------------------%
> Marissa B. P. Adams
> (she/her/hers)
> Phd Candidate, University of Rochester
> *E-mail:* madams at pas.rochester.edu
> *Website:* https://www.pas.rochester.edu/~madams
> <http://www.pas.rochester.edu/~madams#>
> *Current Location:*
> Occupied Seneca Land
> 471 Bausch and Lomb Hall
> University of Rochester
> Rochester, NY 14627
>


-- 
%---------------------------------------------%
Marissa B. P. Adams
(she/her/hers)
Phd Candidate, University of Rochester
*E-mail:* madams at pas.rochester.edu
*Website:* https://www.pas.rochester.edu/~madams
<http://www.pas.rochester.edu/~madams#>
*Current Location:*
Occupied Seneca Land
471 Bausch and Lomb Hall
University of Rochester
Rochester, NY 14627
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