基于拓扑网格方法的多钝体流致振动分析

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (22) : 236-243.

论文

基于拓扑网格方法的多钝体流致振动分析

丁林邹瑞张力邹群峰

作者信息 +

Analysis on the flow-induced motion of multiple bluff bodies based on topological mesh

DING Lin, ZOU Rui, ZHANG Li, ZOU Qunfeng

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文章历史 +

摘要

多钝体流致振动是一个较为复杂的流固耦合过程，普遍存在于自然界和工程领域。为了减小高幅振动时网格变形引起的计算误差，本文基于非定常Navier-Stokes方程对二维双圆柱和三圆柱、三维双圆柱流致振动进行数值求解，采用耦合界面结合拓扑网格变形技术，实现流体与多个运动钝体之间的耦合计算。将数值结果与实验进行比较分析，验证了该数值方法是处理高振幅多钝体流致振动的有效方法。研究结果表明上游圆柱的存在对下游圆柱流致振动和旋涡形成产生明显影响。串列双圆柱流致振动振幅和频率响应与实验测试趋势一致，清晰观察到了涡致振动初始分支和上部分支；并且当Re>8×104时，圆柱流致振动由涡致振动向驰振过渡。圆柱尾涡形态随流致振动分支切换发生变化，当驰振发生时，下游圆柱的尾涡形态受上游圆柱影响难以捕捉。随着双圆柱间距增大，低Re时下游圆柱受到上游圆柱的抑制作用减弱。三维多柱体流致振动计算结果更接近实验值，如何提高三维数值计算速度将是下一步研究工作的重点。

Abstract

The flow-induced motion (FIM) of multiple bluff bodies is a complex phenomenon of fluid-structure interaction. In order to minimize the errors caused by mesh deformation, the dynamic mesh technique of topological change combined with coupling interface was developed to investigate the FIM of multiple bluff bodies. Based on the unsteady Navier-Stokes equations, the FIMs of 2-dimensional two/three circular cylinders and 3-dimensional two cylinders were numerically simulated and then verified by experimental data. The numerical approach is proved to be an effective method to handle large amplitude FIM responses. The results show that the upstream cylinder has a significant influence on the motion and vortex shedding of the downstream cylinder. For two cylinders in tandem, the amplitude and frequency results,which are in excellent agreement with experimental data,exibit the initial and upper branches of the vortex-induced vibration (VIV). When Re>8×104, the transition from VIV to galloping is initiated. The near-wake vortex pattern changes with the switching of FIM branches. It is difficult to identify the vortex pattern of the downstream cylinder when galloping occurs. As the distance between the two cylinders increases, the suppression of the downstream cylinder motion by the upstream cylinder is weakened at low Re. The 3-dimensional simulation of FIM for multiple cylinders makes, the calculation results closer to the experimental values than the 2-dimensional calculation. How to improve the calculation speed of 3-dimensional simulations will be the focus of the next work.

导出引用

丁林邹瑞张力邹群峰. 基于拓扑网格方法的多钝体流致振动分析[J]. 振动与冲击, 2019, 38(22): 236-243

DING Lin, ZOU Rui, ZHANG Li, ZOU Qunfeng. Analysis on the flow-induced motion of multiple bluff bodies based on topological mesh[J]. Journal of Vibration and Shock, 2019, 38(22): 236-243

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