Boundary-layer receptivity under interaction of free-stream turbulence and localized wall roughness  

作　　者：Luyu SHEN Changgen LU 

机构地区：[1]School of Atmospheric Science, Nanjing University of Information Science and Technology [2]School of Marine Science, Nanjing University of Information Science and Technology

出　　处：《Applied Mathematics and Mechanics(English Edition)》2016年第3期349-360,共12页应用数学和力学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.11172143);the Research Innovation Program for College Graduates of Jiangsu Province(No.CXZZ13 0518)

摘　　要：The boundary-layer receptivity under the interaction of free-stream turbu- lence （FST） and localized wall roughness is studied by the direct numerical simulation （DNS） and the fast Fourier transform. The results show that the Tollmien-Schlichting （T-S） wave packets superposed by a group of stability, neutral, and instability T-S waves are generated in the boundary layer. The propagation speeds of the T-S wave packets are calculated. The relation among the boundary-layer receptivity response, the amplitude of the FST, the roughness height, and the roughness width is determined. The results agree well with Dietz＇s experiments. The effect of the roughness geometries on the receptivity is also studied.The boundary-layer receptivity under the interaction of free-stream turbu- lence （FST） and localized wall roughness is studied by the direct numerical simulation （DNS） and the fast Fourier transform. The results show that the Tollmien-Schlichting （T-S） wave packets superposed by a group of stability, neutral, and instability T-S waves are generated in the boundary layer. The propagation speeds of the T-S wave packets are calculated. The relation among the boundary-layer receptivity response, the amplitude of the FST, the roughness height, and the roughness width is determined. The results agree well with Dietz＇s experiments. The effect of the roughness geometries on the receptivity is also studied.

关 键 词：boundary-layer receptivity Tollmien-Schlichting （T-S） wave free-streamturbulence （FST） localized wall roughness 

分 类 号：O357.5[理学—流体力学]