空气动力学学报Issue(3)：345-352,8.DOI:10.7638/kqdlxxb-2013.0083
超声速平板边界层旁路转捩直接数值模拟
Direct numerical simulation of by-pass transition of the supersonic flat plate turbulent boundary layer
朱海涛 1单鹏1
作者信息
- 1. 北京航空航天大学 能源与动力工程学院，北京 100191
- 折叠
摘要
Abstract
Using the characteristic boundary conditions and high-order finite difference schemes,direct numerical simulation(DNS)was performed to investigate the effect of phase and frequency of the periodic blow and suction disturbance which was used to trigger the by-pass tran-sition of the flat plate boundary layer with free stream Ma ∞ =2.25,Re ∞ =2.5×10 7/m (635 000/inch).The numerical results show that the randomness of the disturbance phase is not the nec-essary condition to trigger the transition,and with the deterministic disturbance phase,the aver-age location of transition moves backward when the disturbance frequency increases.However,if the frequency is bigger than a critical value,the transition in the boundary layer will not happen. A DNS database was established under the condition of deterministic disturbance phase.The Van Direst velocity agrees well with the wall and logarithm law of incompressible flat plate boundary layer,and the turbulence intensities coincide with the incompressible flat plate experimental da-tum.The averaged thermodynamic variables are very close to that of reference results.These ver-ify the present DNS results.Then,the statistics of thermodynamic variables fluctuation and Reynolds stress are extracted from the DNS database.Compared with the relative references′DNS results,the disturbance,boundary conditions and numerical methods have observably effect on the second order statistics and the averaged transition position.关键词
平板/超声速/直接数值模拟/湍流边界层/雷诺应力/转捩Key words
flat/supersonic/DNS/turbulent boundary layer/Reynolds stress/transition分类
数理科学引用本文复制引用
朱海涛,单鹏..超声速平板边界层旁路转捩直接数值模拟[J].空气动力学学报,2015,(3):345-352,8.
