Abstract
Mean-flow effects on the pressure–velocity correlation in the turbulent-energy equation are investigated with the aid of a two-scale direct-interaction approximation. Those effects are composed of strain, vorticity, and momentum-diffusion effects, which correspond to the modeling of the rapid term in the pressure–strain correlation of the Reynolds-stress equation. They are missing in the current turbulence modeling in striking contrast to the latter, and become important in turbulent flows accompanying large mean-velocity gradients and curvatures.
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