A second-order closure model based on intermittency factor and conditioned moments is developed. The transport equations for the nonturbulent zone stresses are included in the model. The resulting model is then compared with measurements in several shear flows and satisfactory agreement between calculation and experiment is obtained.
The transport equations for intermittency factor and conditioned moments are analyzed for turbulent shear flows with free boundaries. Conditions are established for molecular diffusion to dominate the progression of the turbulent zone. The terms related to the dynamics of the interface for mean velocity and apparent stresses in turbulent and nonturbulent zones are shown to be linked by a local relation, and the limit of large distance from the turbulent region for the nonturbulent zone stress equation is given.
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