[lordvon]

Hello everyone,

I was wondering what would be the proper inlet boundary condition to mimic a wind tunnel in the case of a propeller or similar device in the test section that accelerates the flow in the streamwise direction.

If we simply use a fixed velocity inlet then unphysical results may occur, since in a real wind tunnel the fixed velocity inlet would not be enforced so rigidly.

Would a total pressure condition be sufficient?

[JBeilke]

The "correct" way to deal with this is to simulate the wind tunnel before and take the flow values (velocity, turbulence, temperature) from the inletsection as input values.

Otherwise do a good measurement of the values.

[Far]

You can find all details in this paper (I am one of the authors)

Masud, J., and Ahmed, S. "Design Refinement and Performance Analysis of Two-Stage Fan for Small Turbofan Engines", Paper # AIAA-2007-23, 45th AIAA Aerospace Sciences Meeting and Exhibit at Reno, Nevada, USA (2007)


http://pdf.aiaa.org/preview/CDReadyM.../PV2007_23.pdf

[lordvon]

I think I will just go with the openfoam BC of totalPressure (atmospheric + dynamic pressures) for the inlet, and atmospheric pressure for the outlet.

[akiss20]

Originally Posted by lordvon

I think I will just go with the openfoam BC of totalPressure (atmospheric + dynamic pressures) for the inlet, and atmospheric pressure for the outlet.

Is your tunnel a closed system? If so, the pressure boundary condition for the outlet may not be valid.

My 2 cents