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K.L.Huang February 20, 2000 10:30

k-e
 
in turbulence case alwayse how do you descide the value of k an e?

allan February 21, 2000 05:46

Re: k-e
 
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

K.L.Huang February 21, 2000 08:36

Re: k-e
 
thanks,but... how is the turbulence intensity ?


allan February 21, 2000 09:49

Re: k-e
 
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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