[FLASH-USERS] Fwd: Target expansion without laser in LaserSlab simulation

[Ong Jian Fuh]

Hi Stelios Passalidis,

The reply from Rigon Gabriel was that FLASH does not take into account 
the bounding energy of solids.

In my opinion (may be I am wrong), the equation of state come with FLASH 
is capped at certain temperature (i.e. far above the room temperature). 
I saw this is the following attachment. So the tabulated EoS data does 
not describe the solid state at room temperature.

There are different type of EoS like FEOS which does not have P<0 
region. But I have not tried that because there is difficulty to convert 
it to flash format.

Regards,
Ong





Ong Jian Fuh
Extreme Light Infrastructure - Nuclear Physics
"Horia Hulubei" National Institute for Physics and Nuclear Engineering
30 Reactorului Street, 077125 Magurele (Ilfov), Romania
www.eli-np.ro

On 15/11/2022 2:37 pm, Stylianos.PASSALIDIS at cea.fr wrote:
> Hi Ong,
> I hope you are doing well! I think I have a same problem. Here is an 
> example for polystyrene and for t=0 so that no laser has been deposited..
> I attach a picture of density over distance. It seems that even at t=0 
> there is a ramp from around 80 microns to reach the "solid density" 
> (in this case 1.43 for Kapton) and it is uniform for all the target 
> surface. Have you found any reason for that?
> Best,
> Stelios Passalidis
>
>
>
> ________________________________________
> From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf 
> of Ong Jian Fuh <jianfuh.ong at eli-np.ro>
> Sent: Thursday, November 10, 2022 10:32 AM
> To: flash-users at flash.rochester.edu
> Subject: [FLASH-USERS] Target expansion without laser in LaserSlab 
> simulation
>
> Dear Flash developers,
>
> Hi. I am checking the laser slab simulation (example.par) without using
> laser, that is, I turn off +laser, and useEnergyDeposition = .false.
>
> I obtained the following results, one using "eos_tab" and "eos_gam"
> (indicated by figure name). I find the target expand quite much and I
> dont know what cause this. It is crucial to the simulation of laser
> prepulse interaction for plasma ablation. It was not suppose to expand
> when aluminium is placed there at room temperature without any
> interaction. Do anyone happen to know what cause this and how to fix it?
> Thanks.
>
> --
> Regards,
> Ong
>
>
>
>
>
> Ong Jian Fuh
> Extreme Light Infrastructure - Nuclear Physics
> "Horia Hulubei" National Institute for Physics and Nuclear Engineering
> 30 Reactorului Street, 077125 Magurele (Ilfov), Romania
> www.eli-np.ro
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