This paper aims to analyze mode shapes and corresponding strain distribution in a two-dimensional plane structure exhibiting flow-induced vibration in the wake field of four different upstream bluff bodies such as cylinder, square, triangle, and D-shape. This research is important from the point of view of flow-induced piezoelectric energy harvesting; wherein, induced strain in the structure is directly related to the amount of energy generated. Mainly, all investigations are carried out at low Reynolds number (Re = 200); however, to widen the scope of the work, other Reynolds numbers are also considered (Re = 300, 500, and 750). The results obtained indicated that the plane structure vibrates in different mode shapes under different wake fields. The square section dominantly gives rise to the fundamental mode vibration, whereas, cylinder, D-shape, and triangular bluff body induce vibration in a mix of fundamental and higher bending modes. Analysis of the corresponding flow regime shows that the position of reattachment point of the downstream shear layer plays an important role in the realization of different vibration modes. The strain distribution under different cases revealed that the wake of a cylindrical bluff body produces highest peak strain, and D-shape bluff body results in highest cumulative strain. From the aspect of energy harvesting, a quantitative comparison of strain-induced and per second charge generation have indicated that for an equivalent flow condition, the D-shape will produce higher energy per unit time than the cases of a square, cylinder, and triangular cross-sections.

本文旨在分析二维平面结构中的振型和相应的应变分布，该结构在四个不同的上游钝体如圆柱，正方形，三角形和D形的尾流场中表现出流致振动。从流致压电能量收集的角度来看，这项研究具有重要意义。其中，结构中的感应应变与产生的能量直接相关。主要地，所有研究都是在低雷诺数下进行的（Re  = 200）；但是，为了扩大工作范围，还考虑了其​​他雷诺数（Re  = 300、500和750 ）。所得结果表明，平面结构在不同的尾波场下以不同的振型振动。方形截面主要引起基本模式振动，而圆柱体，D形和三角形钝体会在基本和更高弯曲模式的混合中引起振动。对相应流态的分析表明，下游剪切层的重附着点位置在实现不同振动模式中起着重要作用。在不同情况下的应变分布表明，圆柱状阻流体产生的峰值应变最高，而D形阻流体产生的累积应变最高。从能量收集方面，