基于一种固体区域迭代算法的圆柱涡激振动数值计算

摘要

An iteration method is adopted in numerical simulation, to solve the motion of an elastically mounted cylinder of VIV based on Fluent UDF codes. Cases of laminar flow and turbulent flow are conduct-ed respectively, within a range of reduced velocity, and cases with different damping ratios are analyzed. Comparison with experimental data verifies the validity of the method. The resuts show that the lift coef-ficient and the amplitude of the cylinder will transform from multi-frequency oscillation to single frequen-cy oscillation, and the maximum amplitude will decrease as damping ratio increases. Therefore damping ratioζ should be regarded as an independent parameter in addition to the well known mass-damping parameter m*ζ.%利用Fluent平台的用户自定义程序（UDF）以及动网格模型，实现了圆柱运动方程的一种迭代求解算法，分别对层流、湍流状态下，弹性支承圆柱体在一定约化速度下的涡激响应进行了数值模拟，探讨了不同阻尼比对涡激响应的影响。结果表明：采用该迭代求解算法对弹性支承圆柱涡激振动的预测结果较为合理；随着阻尼比的逐渐增加，初始支振幅、升阻力系数时程曲线将由多频率拍振，最终变为单一频率主导的振动，且涡激振幅逐渐减小；除了质量-阻尼比联合参数m*ζ外，阻尼比ζ本身也应作为一个重要的涡激影响参数单独进行考量。