振动圆柱绕流气动力系数的数值模拟研究  

NUMERICAL INVESTIGATION OF AERODYNAMIC FORCE COEFFICIENTS FOR A FLOW ABOUT AN OSCILLATING CIRCULAR CYLINDER

作　　者：方平治[1] 顾明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2007年第1期21-23,共3页Journal of Vibration and Shock

基　　金：国家自然科学基金创新研究群体基金(50321003);教育部"高等学校骨干教师资助计划"联合资助

摘　　要：给出了在锁定状态下不同振动条件时气动力系数变化的计算结果及其机理分析。首先给出固定圆柱绕流气动力系数的数值模拟结果;其次,在特定的频率比条件下,计算了升力系数均方根值和平均阻力系数随振幅的变化,并从圆柱的底部压力系数和漩涡生成长度两方面对这种变化进行了机理分析。Computation of changes of aerodynamic force coefficients and its mechanism analysis under different oscillating conditions in lock-in status are given.Numerical results of aerodynamic force coefficients of a flow about a fixed cylinder are firstly obtained.The variation of the root mean square value of lift coefficient and the mean value of drag coefficient versus amplitude in condition of the specified frequency ratio are then calculated.The mechanism analysis for the variation is displayed via the base pressure coefficient of the cylinder and the vortex formation length.

关 键 词：锁定现象 底部压力 漩涡生成长度 振动圆柱 

分 类 号：TB126[理学—工程力学]