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velocity BC for inlet and outlet

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Old   October 18, 2019, 02:15
Question velocity BC for inlet and outlet
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Jochen
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Hi there,

I would like to simulate the flow in a closed area. I only have the body (wall) and the two patches for inlet and outlet. Both, inlet and outlet are the same size. In real, inflow and outflow caused by radial fan and have a velocity of about 10m / s. The pressure is not importent for me.

solver: simpleFoam
turbulence model: k-epsilon

Question: How can I set the velocity at the inlet AND outlet? and how do I set the other BC?

So far:
Inlet: U=10 m/s P=zeroGradient
Outlet:U=-10m/s P=fixedValue

Any information would be great.

Cheers
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Old   June 23, 2020, 08:59
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you should never do that,
you can give the inlet velocity and then give a reference pressure at outlet as BC. bc of mass conservation you should automatically have your mass conserved, i.e. average velocity at patch should be as in inlet.
if you give same value at outlet you will not allow a developed profile.
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