A nonlinear low-Reynolds-number κ-ε model for turbulent separated and reattaching flows—I. Flow field computations

Abstract An improved version of nonlinear low-Reynolds-number κ-e model is developed. In this model, the limiting near-wall behavior and nonlinear Reynolds stress representations are incorporated. Emphasis is placed on the adoption of R y (κ 1 2 y v ) instead of γ+ ( ≡ τ y v ) in the low-Reynolds-number model for predicting turbulent separated and reattaching flows. The non-equilibrium effect is examined to describe recirculating flows away from the wall. The present model is validated by doing the benchmark problem of turbulent flow behind a backward-facing step. The predictions of the present model are cross-checked with the existing measurements and DNS data. The model performance is shown to be generally satisfactory.

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