[FLASH-USERS] Regarding the use of thermoelectric transport

[Hansen, Eddie]

Hello,

Flux limiting the Nernst term may help. There are two parameters to control this:
nernstFlMode
nernstFlCoef

The options for nernstFlMode are “fl_none”, “fl_harmonic”, “fl_minmax”, or “fl_larsen”. The default for nernstFlCoef is 1.0, so you’ll want to lower that to some reasonable value. The choice can be problem-specific, as people just tend to choose a coefficient that gives them “reasonable” results.

--
Eddie Hansen
Applications Group Leader
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of YGW <gwyang991314 at 163.com>
Date: Monday, May 20, 2024 at 11:47 PM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Regarding the use of thermoelectric transport
Dear users,
In MHD simulation, I want to consider the Nernst effect. I did it as follows:
1、in Config file, add "REQUIRES physics/materialProperties/Thermoelectric/ThermoelectricMain/DaviesWen"
2、in flash.par file, add "use_Nernst = .true. "

I think Nernst term is already turned on. However, after running some steps, an error that internal energy was negative is reported. I tried to reduce CFL to 0.1, but it is still unresolved.
When I remove  "use_Nernst = .true. ", the program can run normally.
May I ask how to use the Nernst effect correctly?


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