湍流模型离散精度对数值模拟影响的计算分析

doi:10.7527/S1000-6893.2014.0191

Abstract

Abstract:

Based on the Reynolds-averaged Navier-Stokes(RANS) and structured grid technology, the effect of different discrete methods of shear stress transport (SST) turbulence model on simulation results is analyzed numerically on various grids of different first thickness cells in normal direction with fifth-order weighted compact nonlinear scheme(WCNS). The main purpose of the present work is to provide technical support for the application of high-order difference schemes in complex configurations. The models under study include low-speed NLR 7301 two-element airfoil and high-speed RAE2822 subcritical airfoil; the research work contains the influence of two-order and five-order discrete methods of the turbulence model on convergence history, the distribution of turbulent viscosity and velocity in boundary layer, pressure coefficients and aerodynamic characteristics. Compared with the experimental data, the numerical results indicate that the thickness of first cell in boundary layer and the discrete accuracy of the turbulence model affect the numerical results at low speed obviously, whereas they have little influence on those of high-speed attached flow; the high-order discrete method of the turbulence model is less sensitive to the thickness of first cell in boundary layer; higher accuracy can be obtained but suffer poorer convergence character compared with low-order discrete method of the turbulence model.

Key words: turbulence model, RANS equations, weighted compact nonlinear scheme, numerical simulation, grid density, aerodynamic characteristics

CLC Number:

V211.3

WANG Yuntao, SUN Yan, WANG Guangxue, ZHANG Yulun, LI Song. Numerical analysis of the effect of discrete accuracy of turbulence model on numerical simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(5): 1453-1459.

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Numerical analysis of the effect of discrete accuracy of turbulence model on numerical simulation

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