[FLASH-USERS] [EXT] Exclusivity of 3T for unmagnetized plasmas

[Alvaro Sanchez]

Okey Okey, thank you so much 🙂

Have a great day, really appreciate your help.

And thanks for the FLASH code, it is really awesome
________________________________
From: Hansen, Eddie <ehansen at pas.rochester.edu>
Sent: Tuesday, October 31, 2023 5:05 PM
To: Alvaro Sanchez <alvaro.sanchez at greentownsbyfusion.com>; flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: Re: [EXT] Exclusivity of 3T for unmagnetized plasmas


If the resistivity that you’re setting is independent of temperature, then it doesn’t matter. I only meant that high resistivity is physically more consistent with a low temperature.



--

Eddie Hansen

Applications Group Leader

Flash Center for Computational Science





From: Alvaro Sanchez <alvaro.sanchez at greentownsbyfusion.com>
Date: Tuesday, October 31, 2023 at 11:58 AM
To: Hansen, Eddie <ehansen at pas.rochester.edu>, flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: Re: [EXT] Exclusivity of 3T for unmagnetized plasmas

Thank you very much for your response 🙂

But why is that? it is not my case... it has a high temperature at the beginning, should I change temperature for those first 400ns and change it after? or not change it and leave it with the low temp for the whole simulation?



Thank you very much and sorry for the insistence, this is being really helpful so thanks

________________________________

From: Hansen, Eddie <ehansen at pas.rochester.edu>
Sent: Tuesday, October 31, 2023 3:37 PM
To: Alvaro Sanchez <alvaro.sanchez at greentownsbyfusion.com>; flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: Re: [EXT] Exclusivity of 3T for unmagnetized plasmas



I think this is an ok approach as long as the ‘solid’ body remains relatively cold during that first 400 ns. The 3T capabilities in FLASH should, in theory, not have a problem with this.



--

Eddie Hansen

Applications Group Leader

Flash Center for Computational Science





From: Alvaro Sanchez <alvaro.sanchez at greentownsbyfusion.com>
Date: Tuesday, October 31, 2023 at 8:53 AM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>, Hansen, Eddie <ehansen at pas.rochester.edu>
Subject: [EXT] Exclusivity of 3T for unmagnetized plasmas

Hello dear FLASH users,



I am using the 3T implementation in a variation of the ZPinch default, where the plasma is magnetized.



For magnetizing the plasma, what I do, is to let the plasma be a solid body for the first 400ns of my simulation, with a constant high resistivity to let the magnetic field diffuses through the plasma, then, when setting the plasma to fluid, I change the resistivity to a much lower constant value.



Is this valid? I am worried about the 3T implementation, which according to the users' guide has been made for unmagnetized plasmas, so I'm not sure about my approach. Still, results are quite similar to both experiments and theory.



Thank you very much, really appreciatte any help.



Alvaro 🙂
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