Tricky boundary condition

Project Support
1

I have a simple pipe through which a gas is flowing.
Here’s what I know about the system from measurement:

  • The inlet mass flow (controlled by a mass flow regulator)
  • The pressure at the inlet (influenced by a constriction, ie filter)
  • The outlet mass flow (equal to that at the inlet)
  • The outlet pressure

But there’s a catch: an increase in pressure inside the pipe is driven by the presence of porous material (a filter) near the outlet of the pipe. I don’t really care about how the gas flows through the porous material, so I don’t need to model that necessarily, plus I don’t know enough about the filter to model it. I just know that the net effect of the filter is to increase the pressure to a known value at the inlet of the pipe.

How can I set up these boundary conditions? Is it possible?

Thank you.

2

Hey there, I suggest you try one of the most common and safe combinations for pipe flows, as you can see in this page: Pressure Inlet and Outlet | Boundary Conditions | SimScale.
It is possible to create Custom | Boundary Conditions | SimScale for each face instead, however the values you are going to use should respect the conservation laws for this incompressible case.

Best regards,
Fillia

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3

Okay I think I’ve got it working. Thanks for your help!

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