基于RANS/LES方法的超声速底部流场数值模拟

doi:10.7527/S1000-6893.2016.0145

Abstract

Abstract:

Numerical investigation on supersonic base flow is performed using several Reynolds averaged Navier-Stokes (RANS) and large eddy simulation (LES) hybrid methods based on k-ω shear stress transport (SST) model with compressibility correction, including delayed detached eddy simulation (DDES), modified-DDES (MDDES) and improved-DDES (IDDES) approaches. Third-order MUSCL-Roe and fifth-order WENO-Roe spatial scheme are applied in the investigation. The numerical results show plenty of small scale turbulence structure in supersonic base flow. The complex flow physics are comprehensively understood, which provides references for the base aerodynamic drag reduction and the application of RANS/LES hybrid methods to unsteady highly compressible flows in future research. Numerical dissipation effects of two spatial schemes are investigated. Computational results show that fifth-order WENO-Roe scheme is more validated than third-order MUSCL-Roe scheme when compared with experimental data. Furthermore, comparative analysis of the computational results with several RANS/LES hybrid methods is conducted. The results show that IDDES approach has better performance in regions near the wall than DDES and MDDES approaches.

Key words: RANS/LES hybrid methods, supersonic base flow, compressibility effects, turbulence model, numerical simulations

CLC Number:

V211.3

ZHANG Lu, LI Jie. Numerical simulations of supersonic base flow field based on RANS/LES approaches[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(1): 120102-120102.

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Numerical simulations of supersonic base flow field based on RANS/LES approaches

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