Finite amplitude torsional oscillations of shape-morphing plates immersed in viscous fluids
Finite amplitude torsional oscillations of shape-morphing plates immersed in viscous fluids
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DOI：
10.1063/1.5136256
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发表时间：
2020-05
影响因子：
4.6
通讯作者：
S. Ahsan;M. Aureli
中科院分区：
文献类型：
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作者：
S. Ahsan;M. Aureli
在本文中，我们研究了浸没在静态牛顿不可压缩粘性流体中的薄板横截面的扭转振动。该板与刚性振动同相进行规定的形状变形。该问题完全由三个无量纲参数来描述，这三个参数表示振荡频率以及形状变形的幅度和强度。我们进行了参数研究，以研究通过主动时变形状变形策略控制水动力力矩和功率耗散的可能性。分别采用边界元法和计算流体动力学方法的直接数值模拟，在线性和非线性流态下研究该问题。流动物理学的研究表明，与弯曲振荡情况下观察到的情况类似，形状变形策略可以有效地调节扭转振荡中的涡旋脱落。该...
In this paper, we study torsional oscillations of a cross section of a thin plate submerged in a quiescent, Newtonian, incompressible, and viscous fluid. The plate is subjected to a prescribed shape-morphing deformation in phase with the rigid oscillation. The problem is completely described by three nondimensional parameters indicating oscillation frequency and amplitude and intensity of the shape-morphing deformation. We conduct a parametric study to investigate the possibility of controlling hydrodynamic moments and power dissipation through an active time-varying shape-morphing strategy. The problem is studied in both the linear and nonlinear flow regimes, by employing the boundary element method and direct numerical simulations via computational fluid dynamics methods, respectively. Investigation of flow physics demonstrates that, similarly to what is observed for the case of flexural oscillations, the shape-morphing strategy is effective in modulating vortex shedding in torsional oscillations. The r...