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Turbulence Intensity on CFD post using a wrong reference value

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Old   August 26, 2019, 20:01
Question Turbulence Intensity on CFD post using a wrong reference value
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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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File Type: jpg Turbulence Intensity Problem.jpg (63.6 KB, 10 views)
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fluent - udf - parallel, turbulence intensity

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