I’m trying to simulate a He-N2 shocktube with particulates (the shocktube of Houim) in MFIX. I tried using free-slip walls, but the isothermal wall condition just isn’t correct for this case, and I’d prefer not to hack into the source code to modify the condition (which I did, but the thermal profile of the tube wasn’t correct). I believe I can do it using the cylindrical_2D = .true. flag, but the documentation on how to actually set-up a problem when using this logical flag is not really existent (or at least I haven’t been able to find it). If anyone has any ideas, I’d be grateful!