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Old   February 20, 2000, 10:30
Default k-e
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K.L.Huang
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in turbulence case alwayse how do you descide the value of k an e?
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Old   February 21, 2000, 05:46
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allan
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On velocity inlets

k=1.5*(turbulence intensity * velocity)^2

and in general

ep=cmu^.75 * k^1.5 / length scale

cmu = 0.09 usually

length scale can be 10% of a characteristic dimension
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Old   February 21, 2000, 08:36
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K.L.Huang
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thanks,but... how is the turbulence intensity ?

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Old   February 21, 2000, 09:49
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allan
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turbulence intensity is defined as the fluctuating velocity component divided by the nominal velocity, typically 10% is a combustor 1%-6% in a wind tunnel. Have a look at the values they use in the tutorials or the user guide
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