[FLASH-USERS] Zero or imaginary sound speed error

[Yigeng Tian]

Dear flash-users,

I was using EOS table files from Propaceos software for FLASH, my
simulations running good for a short time but then killed by an error:
"[hy_uhd_eigenParameters-A]: Zero or imaginary sound speed has obtained!
Please try other (more diffusive) slope limiter, flux, order, cfl, etc."

It seems like the more diffusive slope limiter, flux, order, cfl can't
solve this issue. I checked the sound speed calculation in
"hy_uhd_eigenParameters" file and previous user-emails, this error may
caused by some negative values of data points in electron pressure part.
Does anyone know why there are some negative pressure in EOS files and how
to fix it for FLASH simulations? Or the sound spped error is due to
something else?

I would appreciate it for any suggestions and experience, thank you!

Best regards,
Yigeng Tian
Univerisity of Delaware
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