An adaptive DES smodel that allows wall-resolved eddy simulation

作者：Yin Zifei^*; Durbin Paul A

来源：International Journal of Heat and Fluid Flow, 2016, 62: 499-509.

DOI：10.1016/j.ijheatfluidflow.2016.08.009

A modification to the Adaptive-DES method of Yin et al. (2015) is proposed to improve its near-wall behavior. The modification is to the C-lim) that imposes a lower limit on the dynamically evaluated coefficient (C-DES). The modification allows Adaptive-DES to converge to wall-resolved eddy simulation, when grid resolution supports it. On coarse grids, or at high Reynolds number, it reverts to shielded DES - that is to DDES. The new formulation predicts results closer to wall-resolved LES than the previous formulation. It provides an ability to simulate transition: it is tested in both orderly and bypass transition. In fully turbulent, attached flow, the modification has little effect. Any improvement in predictions stem from better near-wall behavior of the adaptive method.

• 出版日期2016-12