turbulence intensity values displayed by Fluent are different from what they should be
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Users somtimes notice that in the FLUENT post-processing, the turbulence intensity gives bogus values (very large or very small) and associates that to a display problem. When they compute sqrt(ke)/|V| the values are near what they would expect. The values reported for Turbulence Intensity (TI) are based on the reference velocity, which is defined in the reference values panel (Report -> Reference Values). The turbulence intensity being defined by FLUENTas : TI = sqrt( (2/3)*k )/Vref However, some users prefer to use the local velocity magnitude: TI = sqrt( (2/3)*K )/Vmag-local To do this, one has two alternatives : 1) Define a Custom Field Function using the above expression that involves Vmag-local 2) Change Vref in the reference panel from the 1.0 m/s default value. In FLUENT 6, the Turbulence intensity is given as percentage as opposed to fraction in Fluent 5.6 and below. |
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