[FLASH-USERS] [EXT] Re: Laser across a 1D domain

[Zach Barfield]

Eddie's description is correct. Apologies for the lack of clarity.

I have been working in 2D cylindrical prior to this. My problem is the
finite size of the z-dimension, I would like to avoid this issue. My
understanding of this simulation space is that by restricting my domain to
1D (radius) I can approximate an infinitely-long axial dimension.

It is not clear to me how the absorption physics would be calculated
without dimension perpendicular to the radius.

-Zach

On Mon, Aug 16, 2021 at 11:35 AM David Blackman <drblackman at eng.ucsd.edu>
wrote:

> Yeah, that also make sense, as simulating he plasma expanding laterally
> through the lasers radial beam profile. It still makes more sense to do
> that as a 2D cylindrical simulation though surely? Would the absorption
> physics even work like that in 1D?
> On 16/08/2021 08:26, Eddie Hansen wrote:
>
> If I understand correctly, the objective is to have a laser that travels
> in the axial direction (perpendicular to the radius), and the beam has a
> radial profile. He wants to simulate in 1D cylindrical and observe plasma
> expansion radially.
>
> On Mon, Aug 16, 2021, 10:13 AM David Blackman <drblackman at eng.ucsd.edu>
> wrote:
>
>> I'm not sure I understand exactly what you are trying to do. What you
>> asking doesn't seem to make sense. The laser will travel along the radius,
>> yet your super Gaussian profile will be spatially varying at 90 degrees to
>> the radius, and you want to do it in 1D. I suspect you want a polar
>> geometry with the laser traveling in from the radius, right?
>>
>> Maybe look at the 2D laser slab? You might be able to put something
>> together with cylindrical geometry, you could model it as a circle arc at
>> the end of a tube with the laser coming in from the longitudinal direction
>> maybe? Otherwise a well refined Cartesian grid might be better.
>> On 16/08/2021 07:59, Thibault Goudal wrote:
>>
>> Hello,
>> just to contribute to the conversation, in the example1d.par, the
>> geometry is cartesian. I haven't seen explicitely a flash.par input deck
>> including 1D spherical geometry and laser energy deposition.
>> I'm not sure that it's possible so far unless mimicing a spherical
>> geometry with cartesian/cylindrical mesh but not confident of catching the
>> physics accurently.
>>
>> ------------------------------
>> *De: *"Zach Barfield" <zachbarfield60 at gmail.com>
>> <zachbarfield60 at gmail.com>
>> *À: *"Andy Sha Liao" <andy at f.energy> <andy at f.energy>
>> *Cc: *"flash-users" <flash-users at flash.uchicago.edu>
>> <flash-users at flash.uchicago.edu>
>> *Envoyé: *Lundi 16 Août 2021 16:39:16
>> *Objet: *Re: [FLASH-USERS] Laser across a 1D domain
>>
>> Yes,
>> In example1d.par the laser is a single ray that propagates along the
>> radius. I am interested in sending a spatially-varying (supergaussian)
>> laser across the radius.
>>
>> -Zach
>>
>> On Mon, Aug 16, 2021 at 10:20 AM Andy Sha Liao <andy at f.energy>
>> <andy at f.energy> wrote:
>>
>>> Zach,
>>>
>>> Have you looked at example1d.par in LaserSlab?
>>>
>>>
>>> Andy
>>>
>>> On Mon, Aug 16, 2021 at 9:05 AM Zach Barfield <zachbarfield60 at gmail.com>
>>> wrote:
>>>
>>>> Hello all,
>>>> Does anyone know how to simulate a laser impinging *across* the radius
>>>> of a 1D radial domain?
>>>> It seems to me that FLASH has no capability of including dimensionality
>>>> in the laser beam when using a 1D geometry, is this true?
>>>>
>>>> I am using a 1D radial domain because I would like to simulate the
>>>> laser heating of a cylinder of gas with an approximately infinite
>>>> z-dimension. I am only interested in the temporal evolution of the radial
>>>> profile.
>>>>
>>>> Cheers,
>>>> Zach Barfield
>>>>
>>>
>>
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