A source term model of perturbation in a numerical study on flows around a slender body of revolution at a high angle of attack  

作　　者：Yang Liu Dongjun Ma Dejun Sun Xieyuan Yin 

机构地区：[1]Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China

出　　处：《Progress in Natural Science:Materials International》2009年第12期1831-1835,共5页自然科学进展·国际材料(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.10432020);the 111 Project of China(Grant No.B07033).

摘　　要：A numerical study on flows around a slender body of revolution at a high angle of attack is conducted to investigate the influence of strength and circumferential angle of perturbation on flow asymmetry.A source term model is applied to simulate a real geometrical perturbation near the tip of the slender body.It can greatly facilitate the adjustment of perturbation strength.The results show that the bistable phenomenon does not appear any more at a small perturbation strength.For different perturbation strengths,the energy of the asymmetric perturbation flow experiences a similar spatial exponential growth regime with the same growth rate.The appearance of the bistable phenomenon is closely related to nonlinear saturation of the perturbation flow as perturbation strength increases.A numerical study on flows around a slender body of revolution at a high angle of attack is conducted to investigate the influence of strength and circumferential angle of perturbation on flow asymmetry. A source term model is applied to simulate a real geometrical perturbation near the tip of the slender body. It can greatly facilitate the adjustment of perturbation strength. The results show that the bistable phenomenon does not appear any more at a small perturbation strength. For different perturbation strengths, the energy of the asymmetric perturbation flow experiences a similar spatial exponential growth regime with the same growth rate. The appearance of the bistable phenomenon is closely related to nonlinear saturation of the perturbation flow as perturbation strength increases.

关 键 词：Slender body High angle of attack Asymmetric vortex Source term model 

分 类 号：O35[理学—流体力学]