湍流模型系数不确定度对翼型绕流模拟的影响

doi:10.7527/S1000-6893.2018.22581

Abstract

Abstract: The effects of uncertainty in the turbulence model closure coefficients on the simulation of flow over RAE2822 airfoil are investigated in this paper using a non-intrusive polynomial chaos method. The integral values (including lift and drag coefficients) and local flow field variables (e.g. pressure coefficient, skin friction coefficient, and Mach number) are considered as the output quantities of interest. The investigation begins with a single stochastic input variable, the von Karman constant. Then the uncertainty in nine closure coefficients of the Spalart-Allmaras model is taken into account. The system response is thus obtained, including the mean value, variance and extreme values. Finally, Sobol indices are used to evaluate the relative contributions of each closure coefficient to the variation of the output quantities. Since the conclusion in this paper is drawn from one single test case of the RAE2822 airfoil, further verification through the simulations of other cases is still needed.

Key words: uncertainty quantification, polynomial chaos, turbulence model, von Karman constant, flow over airfoil

CLC Number:

V211.3

ZHAO Hui, HU Xingzhi, ZHANG Jian, CHEN Jiangtao, MA Mingsheng. Effects of uncertainty in turbulence model coefficients on flow over airfoil simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(6): 122581-122581.

References

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Effects of uncertainty in turbulence model coefficients on flow over airfoil simulation

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