FORCE CHARACTERISTICS AND VORTEX SHEDDING OF A PITCHING FOIL IN SHEAR FLOWS  

作　　者：LIDan-yong LIUNan-sheng LUXi-yun YINXie-zhen 

机构地区：[1]DepartmentofMechanicsandMechanicalEngineering,UniversityofScienceandTechnologyofChina,Hefei230026,China

出　　处：《Journal of Hydrodynamics》2005年第1期27-33,共7页水动力学研究与进展B辑（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos: 10332040; 10125210;10302028); the Innovation Project of the Chinese Academy of Sciences (Grant Nos: KJCX SW L04; KJCX2 SW L2); and the Programme of Hundred Talents of the Chinese Academy of Sciences.

摘　　要：The objective of this study is to deal with unsteady force acting on a pitching foil in shear flow and to study the relation of the force characteristics with vortex shedding near the foil. The two dimensional incompressible Navier Stokes equations in the vorticity and stream function formulation were solved with the fourth order essentially compact finite difference schemes for the space derivatives and a fourth order Runge Kutta scheme for the time advancement. The force characteristics and vortex shedding of the pitching foil in shear flows were investigated. The effects of some typical factors, including the incoming flow shear, the oscillating frequency and amplitude, on the vortex shedding and force behavior were analyzed and discussed.The objective of this study is to deal with unsteady force acting on a pitching foil in shear flow and to study the relation of the force characteristics with vortex shedding near the foil. The two dimensional incompressible Navier Stokes equations in the vorticity and stream function formulation were solved with the fourth order essentially compact finite difference schemes for the space derivatives and a fourth order Runge Kutta scheme for the time advancement. The force characteristics and vortex shedding of the pitching foil in shear flows were investigated. The effects of some typical factors, including the incoming flow shear, the oscillating frequency and amplitude, on the vortex shedding and force behavior were analyzed and discussed.

关 键 词：vortex dynamics vortex shedding FORCE unsteady flow locomotion BIOMECHANICS 

分 类 号：O35[理学—流体力学] Q66[理学—力学]