基于涡激振动压力场模态分解的激振流场特征分析

doi:10.16411/j.cnki.issn1006-7736.2025.03.010

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大连海事大学学报 ›› 2025, Vol. 51 ›› Issue (3) : 96-104. DOI: 10.16411/j.cnki.issn1006-7736.2025.03.010

基于涡激振动压力场模态分解的激振流场特征分析

刘市委¹，战庆亮^*1,2，张冠华³，刘鑫³，张田¹,范颖芳¹

作者信息 +

VIV flow feature analysis based on POD decomposition of pressure data

LIU Shiwei¹， ZHAN Qingliang^*1,2,ZHANG Guanhua³，LIU Xin³ ,ZHANG Tian¹,FAN Yingfang¹

Author information +

文章历史 +

摘要

流场数据中隐含了涡激振动的激振机理，模态分解是对流场数据的时空特征进行分析的有效方式之一。然而在发生涡激振动时，结构与网格、观测点的相对位置发生变化，难以直接对固定坐标下的观测数据进行特征分析。为此，本文采用平动参考系方法开展涡激振动的流场模拟与数据提取，提出激振流场模态分解的流动特征研究方法。采用平动参考系方法模拟低雷诺数圆柱的涡激振动现象，得到不同频率比下的压力场数据。采用本征正交分解法(POD)分解流动数据，得到圆柱周围及下游流场的空间模态与时间系数。结果表明：振动时模态能量发生了转移，第二、三阶模态是引起流致振动的关键因素，且模态频率在不同振动状态下存在规律性变化趋势。本文对发生振动的流场开展特征分解，可为流致振动问题的流动机理分析提供新的研究方法。

Abstract

The spatio-temporal characteristics of the flow that cause vortex-induced vibrations contain the excitation mechanism, and modal analysis is an effective way to analyze the flow system. However, when vortex-induced vibration occurs, the relative position of the structure to the grid or observation point changes over time, and it is difficult to directly analyze the observed flow data using a fixed coordinate system. A modal decomposition method for vortex-induced vibration flow was proposed by using a translational reference system to simulate the vortex-induced flow and extract the flow data. The vortex-induced vibration phenomenon of a low Reynolds number cylinder was simulated by the translational reference system, and the pressure data at different frequency ratios were obtained,while the flow data were decomposed by the proper orthogonal decomposition (POD) method, and the spatial modes and time coefficients of the flow around and downstream of the cylinder were obtained. The results show that the modal energy is transferred during vibration, while the second and third modes are the key factors causing the flow-induced vibration, and the modal frequencies change with a certain regularity under different vibration states. This study provides a new research method to investigate flow-induced vibration mechanism from flow decomposition perspective.

导出引用

刘市委, 战庆亮, 张冠华, 刘鑫, 张田, 范颖芳. 基于涡激振动压力场模态分解的激振流场特征分析[J]. 大连海事大学学报. 2025, 51(3): 96-104 https://doi.org/10.16411/j.cnki.issn1006-7736.2025.03.010

LIU Shiwei, ZHAN Qingliang, ZHANG Guanhua, LIU Xin, ZHANG Tian, FAN Yingfang. VIV flow feature analysis based on POD decomposition of pressure data[J]. Journal of Dalian Maritime University. 2025, 51(3): 96-104 https://doi.org/10.16411/j.cnki.issn1006-7736.2025.03.010

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