基于RANS-LES混合方法的翼型大迎角非定常分离流动研究

doi:10.7527/S1000-6893.2013.0263

Abstract

Abstract:

A delayed detached eddy simulation (DDES) method, which is a hybrid Reynolds average Navier-Stokes-large eddy simulation (RANS-LES) method, is proposed for static and oscillating NACA 0015 airfoil flow simulations and the computational results are compared with experiment data. The vortex shedding phenomenon of the massive separation flow on the leeward of the airfoil at high angles of attack is captured by the DDES method in static simulations, while it is ignored in unsteady RANS computations. The time averaged pressure coefficients given by the SST-DDES method which is based on the original shear stress transport (SST) turbulence model agree very well with experiment data in all proposed RANS and DDES models. The unsteady aerodynamic loads hysteresis curves obtained by the DDES method in forced oscillation airfoil flow computation at high angles of attack agree with the experiment data better than the traditional unsteady RANS simulation results do, and the step jump of the drag and pitch moment coefficients at the maximum angle of attack is described accurately, while the RANS method gives the absolutely wrong trend.

Key words: hybrid RANS-LES method, detached eddy simulation, flow separation, vortex shedding, forced oscillation, aerodynamic load, high angle of attack

CLC Number:

V211.3

LIU Zhou, YANG Yunjun, ZHOU Weijiang, GONG Anlong. Study of Unsteady Separation Flow Around Airfoil at High Angle of Attack Using Hybrid RANS-LES Method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(2): 372-380.

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Study of Unsteady Separation Flow Around Airfoil at High Angle of Attack Using Hybrid RANS-LES Method

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