[FLASH-USERS] Negative 3T internal energy error when increasing refinement

[Rover, Edoardo]

Dear FLASH users,

I am attempting to set up some simulations where I am including the extended-MHD module, particularly the Nernst effect. I ran some preliminary simulations at "lrefine_max = 3" in order for things to work properly, and they run correctly through the end. However when I increase the max refinement to 4, the code crashes with the error "Negative 3T internal energy error, CHECK LOG".

I already attempted several corrections, such as increasing the temperature of the three materials I am using, D2 in the target, CH as a wall and He where the vacuum chamber is supposed to be. Pre-ionizing the materials to 0.02 seem to do nothing either, I may have to attempt to pre-ionize further.

Another thing I did not attempt is increasing the number of blocks in the domain, which at the moment are 2 x 4 blocks (each multiplied by 16 from the setup_call).

I also heard that one can modify the resolution in a localized region of the domain when you write the Fortran geometry, could you provide more information on that?

Best regards,

Edoardo Rovere
Postdoctoral Researcher,
Center for Energy Research, UCSD,
3183 Matthews Ln, La Jolla, CA 92093
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