Ibelieve that Thies and Tam are probably correct in their sug- gestion that the difficulty in predicting the mixing in turbulent axisymmetric jets, by using the standard k-ε model, is caused by differences between the large structures in axisymetric jets and in the flows that were use to calibrate the model initially. Con- trary to the authors' claims, however, I do mot think that the Pope and Sarkar modifications represent the correct physics of turbulent mixing in axsisymmeric and three-dimensional jets.
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