空气动力学学报2019，Vol.37Issue(3)：400-405,411,7.DOI:10.7638/kqdlxxb-2016.0129
平板自由下落的数值模拟
Numerical simulation of freely falling plates
摘要
Abstract
In this paper,2-Dimension freely falling plates with different mass distributions are simulated by numerically solving the equations of motion coupling with the Navier-Stokes equations.With moving mesh,the motions related to different parameters are studied.The traj ectories are identified and the unsteady dynamics are given by considering different dimensionless moments of inertia,and the initial falling angle and centroid positions.The results show that,except the three known classical traj ectories:fluttering,tumbling,steady descent, we also observe two new motions.These motions are asymmetrical-fluttering and flutter-tumbling traj ectories.They are caused by the centroid position deviating from the center of the plate and the dimensionless moment of inertia in the range of 0~0.9 5.These motions turn to the tumbling when the centroid position is beyond 0.1 3L.It indicates that the dimensionless moment of inertia and centroid position are important parameters in freely falling plates,but the physical mechanisms are different in falling motions.The present results can provide academic reference in study of low Reynolds number problems.关键词
自由下落平板/N-S方程/运动方程/数值模拟/无量纲转动惯量/质心位置Key words
freely falling plates/Navier-Stokes equations/equations of motion/numerical simulation/dimensionless moments of inertia/centroid positions分类
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CAI Chenfang,LIANG Bin..平板自由下落的数值模拟[J].空气动力学学报,2019,37(3):400-405,411,7.基金项目
国家自然科学基金(11402253) （11402253）
