# References for Mixing-length calculation?

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 March 28, 2001, 05:28 References for Mixing-length calculation? #1 Ray Guest   Posts: n/a Hi, Could anybody tell me some reference books or papers on how to calculate mixing-length in 3-D simulating? say, I have got the velocity field,etc... Many thanks! Ray

 March 28, 2001, 17:44 Re: References for Mixing-length calculation? #2 Selina Tracy Guest   Posts: n/a

 March 29, 2001, 05:26 Re: References for Mixing-length calculation? #3 Ray Guest   Posts: n/a Thanks! Selina. The problem rises from that in most turbulence modelling, the mixing-length is prescribed for model closure. Hence the mixing-length may be grid dependent. But physically, it should depend on the system operating conditions. So what I am concerning is if I can derive out the mixing-length from the computed flow field. Some work seems has been done for 2-D case, such as Von Karman's formula which related the mixing-length to the velocity profile. But how about 3-D? Any more clue or suggestion? Ray crst15 likes this.

 March 31, 2001, 18:45 Re: References for Mixing-length calculation? #4 Christophe Guest   Posts: n/a Well, it did not caught much of the context, but... mixing length should be close to the length scale given by kolmogorov's equation -for high Reynolds-: mix_len =~ Cmu^(3/4) * k^(3/2) / epsilon Also, if your flow looks like a single-bounded one (and wall is mostly homogeneous) you may apply von Karman's formula but both should remain the same close to the wall... Yours, Christophe

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