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Turbulence Intensity on CFD post using a wrong reference value |
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August 26, 2019, 20:01 |
Turbulence Intensity on CFD post using a wrong reference value
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Phil
Join Date: Aug 2019
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Hi all,
Recently, I have tried to confirm the turbulence intensity calculation on Fluent by creating a user-defined expression to compute the turbulence intensity as follows: Turbulence intensity = sqrt(2/3*Turbulence Kinetic Energy)/(Reference Velocity) Surprisingly, this expression does not return the exact the same value as the one calculated automatically on Fluent. In low-velocity regions, the error is quite small, less than 0.1 %, but in higher speed regions the error can be as high as 2.5 %. Does someone know how to explain this difference? Please see the attached picture with the calculations. |
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fluent - udf - parallel, turbulence intensity |
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