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Old   July 25, 2001, 13:45
Default Production/Dissipation Ratio
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Hi everybody. Does anybody know what the ratio of production to dissipation looks like for adverse pressure gradient flows in the outer layer of a turbulent boundary layer? In a zero pressure gradient flow this asymptotes to 1, but for adverse pressure gradient the value is bigger. Any references? How does k-epsilon model predicted? Over or underpredictcs? I have some results which predict a higher ratio than standart k-epsilon. I need to verify this. Thanks in advance. John
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Old   July 25, 2001, 15:39
Default Re: Production/Dissipation Ratio
John C. Chien
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(1). Prof. W. Rodi has published a paper many many years ago dealing with the adverse pressure gradient issue. (published in ASME?) (2). It's a short paper, but it has profile distribution vs his improved model. It's one of the early attempt to make the model more sensitive to the pressure gradient. (I think, the paper was published before mid-80's)
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Old   July 30, 2001, 22:18
Default Re: Production/Dissipation Ratio
clifford bradford
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No doubt you can obtain info on this in David Wilcox's turbulence modelling book.
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