Implementing euler equation custom boundaries

[Nadexterbrown]

Hello All,
I am new here and trying to get the hang of using Pyro to solve the Euler equations. I have been able to follow and run the Sod test. Currently, I am a bit confused about how to set up custom boundary conditions. I am attempting to solve the Euler equation for a channel with an imposed velocity at the left-hand side (similar to a piston accelerating). However, from my understanding, to set a Dirichlet boundary condition value, one must go through the multigrid solvers, requiring one to restate the problem again using the equation types provided. Am I understanding this correctly? Any assistance on this would be greatly appreciated. Thank you and have a nice day.
Best,
Nolan Dexter

[zingale]

I think that the closest we have to what you are interested in is with the double Mach reflection problem, ramp. The boundary conditions for that are here:

pyro2/pyro/compressible/BC.py

Line 183 in a3da1f1

elif bc_name == "ramp":

I would start with something like that, but if it doesn't work well, we might want to try to do a proper inflow using a one-sided stencil and specifying the interface state outside of the domain directly.