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Comparative assessment of SAS and DES turbulence modeling for massively separated flows

Acta Mechanica Sinica 2016年第1期32卷 12-21页

作者： Weilin Zheng Chao Yan Hongkang Liu Dahai Luo School of Aeronautic Science and Engineering Beihang University

Numerical studies of the flow past a circular cylinder at Reynolds number 1.4 × 105 and NACA0021 airfoil at the angle of attack 60° have been carried out by scale-adaptive simulation （SAS） and detached eddy simu- lation （DES）, in comparison with the existing experimental data. The new version of the model developed by Egorov and Menter is assessed, and advantages and disadvantages of the SAS simulation are analyzed in detail to provide guidance for industrial application in the future. Moreover, the mechanism of the scale-adaptive characteristics in separated regions is discussed, which is obscure in previous analyses. It is con- cluded that： the mean flow properties satisfactorily agree with the experimental results for the SAS simulation, although the prediction of the second order turbulent statistics in the near wake region is just reasonable. The SAS model can produce a larger magnitude of the turbulent kinetic energy in the recir- culation bubble, and, consequently, a smaller recirculation region and a more rapid recovery of the mean velocity out- side the recirculation region than the DES approach with the same grid resolution. The vortex shedding is slightly less irregular with the SAS model than with the DES approach, probably due to the higher dissipation of the SAS simulation under the condition of the coarse mesh.

关键词： Scale-adaptivelength scale Bluff bodies simulation von Karman massively separated flows Computational fluid dynamics

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Detached-eddy simulations and analyses on new vortical flows over a 76/40° double delta wing

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Science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1062-1073页

作者： LI Qin SUN Dong ZHANG HanXin State Key Laboratory of Aerodynamics China and National Laboratory of CFD Beijing University of Aeronautics and Astronautics

Numerical simulations were performed on the massively separated flows of a 76/40° double delta wing using detached-eddy simulation(DES).A new type of cross-flow vortex is suggested.A vortex was initially generated near the junction of the strake and wing,which then moved towards the wing tip at certain wavelength and *** were made in detail on the mechanism of the generation of the cross-flow vortex,that is,the inviscid cross-flow instability which differs from that of the swept blunt ***-section topology of the cross-flow vortex is also investigated,and the wavelength of the vortex array and the characteristic frequency are *** analyses showed that the cross-flow vortices have an influence on the pressure distribution,which can cause a 10%-20% deviation from the averaged distribution.

关键词： double delta wing massively separated flows cross-flow instability vortex substructures DES

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