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Hey FLASH Users,</div>
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I have been trying to run simulations of the Richtmyer-Meshkov Instability and exploring the impacts of changing the Prandtl and Schmidt numbers. I am running this on a Mac.</div>
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For this I need diffusion, conduction, and viscosity. I asked about this a week or two ago, and thanks to those who offered help and support. </div>
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For anyone interested or maybe experiencing the same issue, when I was using the unsplit diffusion option, my program ran into a SIGSEGV error (Segmentation fault). I spent a week or so trying to work through my code to find the error. In the end I just downgraded
HDF5 and, without changing my code, FLASH now runs fine without the SIGSEGV error, and I am getting decent results. No clue what this means but thought I would share.</div>
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Anyway, I have been trying to establish the Prandtl and Schmidt numbers into FLASH, however I have some questions:</div>
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In unit 22.1, looking at conduction constants, the doc says there is an option for a constant coefficient of diffusion. Would this be alpha, the thermal diffusivity constant, or is this k, the thermal conductivity constant?</div>
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Also, I need the mass diffusivity constant, D, to find the Schmidt number. Section 22.6 (mass diffusivity) is empty and says the unit provides only non-operational functionality. Is there any way I can specify the mass diffusivity with Hydro/Unsplit, or should
I just try and calculate this myself from other parameters?</div>
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Thanks for reading!</div>
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Kind regards,</div>
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Max</div>
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