Abstract
AbstractIn chemical engineering, turbulent shear flows are often encountered. The grid induced separation (GIS) and the slow RANS‐LES transition issues should be alleviated when the delayed detached‐eddy simulation (DDES) is used to simulate turbulent shear flows. This paper studies the performance of the production‐limited DDES (PL‐DDES) model in improving the GIS and the slow RANS‐LES transition issues. Since the simplified IDDES (S‐IDDES) model is proposed to improve the GIS issue, the S‐IDDES model is chosen as the model for comparison. The simulation results show that the PL‐DDES model with constant C d1 = 14 alleviates the GIS issue better than the S‐IDDES model and the PL‐DDES model with C d1 = 8. The results of the free shear layer show that the PL‐DDES model can switch RANS to LES more rapidly and unlock the Kelvin‐Helmholtz instability more effectively than the S‐DDES model. For the backward‐facing step flow, the S‐IDDES model performs poorly when unlocking the Kelvin‐Helmholtz instability in the separation zone. On the other hand, the PL‐DDES model has a rapid RANS‐LES transition after the step and produces a significant transport of momentum in the shear layer, leading to reasonable separation distance and flow structures.
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