Inlet/Outlet: Density/Pressure Fluctuations


I am trying to use inlet/outlet functionality to simulate a drag flow as shown in examples/mdbc/05_FlowCylinder. In general my experience is that at Reynolds = 200 I get a good comparison with drag coefficients from literature (as also documented in Re200.ods in same folder), but for example if I try Re = 2000 (by adding another zero after comma for visco value), then the drag force is 3 times less than what it should be.

I think this is due to the pressure/density not being stable throughout the simulation and over time the simulation destabilizes and pressure becomes high and uniform in the whole simulation field. I have already made the domain considerably larger.

Is this a defiency in the inlet/outlet model which cannot be resolved as of now?

Kind regards


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