Abstract
The transport equations for conditionally averaged Reynolds stresses have been derived for use in computation of turbulent flows with intermittency. In addition to terms corresponding to those appearing in conventional transport equations, the conditional transport equations involve entrainment and interaction terms arising from the time-sharing of different zones of intermittent flows. The new terms have been examined using available experimental data taken in interacting shear flows. Careful treatment of these terms is generally required for proper modelling. In certain cases, however, the magnitudes of the total of the extra terms are small and the evolution of the conditional Reynolds stresses are little influenced by the existence of the other zone.
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