基于RANS/LES混合方法的分离流动模拟

doi:10.7527/S1000-6893.2020.23642

Abstract

Abstract: Aircraft maneuvering at high angle of attack and fast pitch leads to large-scale and unsteady vortices in the flow field. Since the traditional Reynolds-Averaged Navier-Stokes (RANS) model cannot accurately simulate the flow field structure, the hybrid RANS/LES model, based on the development trend of international research, is required to accurately simulate the complex separated flow. In this paper, the dual RANS/ Large Eddy Simulatio (LES) hybrid computational model based on zonal mixing and turbulence scale mixing is further developed and applied. Through large static and dynamic turbulent separation flow of typical simplified models, DES-based methods are tested and validated. The correctness and validity of Improved Delayed Detached-Eddy Simulation (IDDES) model in the application to dynamic problems are emphatically studied. The reliability, robustness and accuracy of the numerical simulation method and corresponding calculation software are also tested and verified. Typical examples include supersonic cylindrical bottom flow, transonic square cavity flow and deep stall separation eddy simulation of NACA0015 airfoil. The requirements of three flow types for turbulence simulation methods are provided: steady separated flow, static unsteady separated flow, and dynamic unsteady separated flow. The results show that for static separated flows, DES, DDES and IDDES models are equivalent for static unsteady separated flows, while IDDES models are required for dynamic unsteady separated flows. Meanwhile, the IDDES method developed in this paper can effectively solve the problem of log layer mismatch.

Key words: unsteady flow, RANS/LES hybrid model, separated flow, detached eddy simulation, IDDES model

CLC Number:

V211.3

CHEN Hao, YUAN Xianxu, BI Lin, HUA Ruhao, SI Fangfang, TANG Zhigong. Simulation of separated flow based on RANS/LES hybrid method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(8): 123642-123642.

References 27

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Simulation of separated flow based on RANS/LES hybrid method

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