[FLASH-USERS] Simulating Low Density Gases in FLASH

[Conor Fegan]

Dear FLASH users,

I am trying to improve my understanding of the capabilities of FLASH when working with low density background gases. I am working with a modified LaserSlab problem which includes a high energy nanosecond laser interacting a solid target surrounded by low density gas to model an experiment. The gas density required is 10^-9 g/cm^3, three orders of magnitude lower than what is typically considered vacuum in FLASH. To best model this, we have written a simple tabulated EOS for an ideal gas in an attempt to retain the ionisation physics. However, we are wondering if there are any other numerical artefacts or any nuances to consider when FLASH is dealing with low densities. I would be very grateful for any explanations to help improve my knowledge of FLASH.

Kind Regards,
Conor Fegan
PhD Student
Queen's University Belfast


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