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Wind tunnel contraction turbulence intensity fluctuations

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Old   December 12, 2020, 02:48
Default Wind tunnel contraction turbulence intensity fluctuations
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Hello,
I am fairly new to using Ansys fluent and currently trying to simulate the flow inside a subsonic low speed wind tunnel contraction. I have created the 3D model using Solidworks and used a hexahedral mesh with edge sizing done to create a finer resolution near the boundary. I used a SST K-w model and specified the velocity of the velocity inlet and pressure of the pressure outlet. I specified the turbulence intensity of the inlet to be 1%.

However, the result from the simulation generates a relatively high turbulence intensity at the contraction outlet. And I tried to recreate a research paper finding and ran to the same problem of high turbulence intensity.

I have attached the results I obtained in my simulation.

Can anyone shed any light on this matter ?

Thanks in advance.
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File Type: jpg FFF-32-00037.jpg (160.0 KB, 5 views)
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ansys fluent, contraction, turbulence intensity, wind tunnel

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