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[Robert Caulk <question640093@xxxxxxxxxxxxxxxxxxxxx>]

Question #640093 on Yade changed:
https://answers.launchpad.net/yade/+question/640093

Robert Caulk posted a new comment:
Ah, I think I understand now. You are saying that the only approximation
is the constant viscosity. I was just saying the change of viscosity of
geofluids as a function of pressure is small enough in the liquid phase
at a constant temperature that it is OK to neglect it. This is why I say
we are assuming constant temperature with our constant viscosity
assumption. But this is likely what you were getting at when you
mentioned that this model is inappropriate for gases earlier.

I also now realize that the change of fluid density at low mach numbers
is negligible too, so it seems the scheme is actually accurately
considering all possible compressibility given the aforementioned
assumptions. I guess it would be futile to try and gain accuracy by
considering these small changes to viscosity within the pore throats
without considering full convective and conductive heat transfer in the
system.

>Which equations do you have in mind for compressible flow between
parallel plates?

Honestly, I need to spend time looking into the options. But my
preliminary search was pretty bleak a couple weeks ago.

Thank you for taking the time to explain these details to me.

Best,

Robert

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