Shape-Morphing Dynamics of Soft Compliant Membranes for Drag and Turbulence Modulation
Shape-Morphing Dynamics of Soft Compliant Membranes for Drag and Turbulence Modulation
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用于阻力和湍流调制的软柔顺膜的形状变形动力学
DOI：
10.1103/physrevlett.131.114003
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发表时间：
2023
影响因子：
8.6
通讯作者：
Breuer, Kenneth S.
中科院分区：
文献类型：
--
作者：
Mathai, Varghese;Das, Asimanshu;Naylor, Dante L.;Breuer, Kenneth S.
我们研究了一个高顺应性的膜盘在均匀流中迎面放置的运动学和动力学。随着流速的增加，膜非线性地变形成越来越像降落伞的形状。这些空气动力学细长的材料表现出修改的阻力定律，这与弹性流体动力学相互作用。我们预测的非定常结构响应的膜使用的非线性，气动弹性模型与实验测量的变形和力的波动非常一致。与同时膜接口跟踪，力测量和流跟踪，我们揭示了一个特殊的偏度在膜的振荡触发湍流生产的唤醒，从而调制阻力。目前的工作展示了软材料和流体湍流之间复杂的相互作用，从而产生了新的、新兴的系统特性。
We study the kinematics and dynamics of a highly compliant membrane disk placed head-on in a uniform flow. With increasing flow velocity, the membrane deforms nonlinearly into increasingly parachutelike shapes. These aerodynamically elongated materials exhibit a modified drag law, which is linked to the elastohydrodynamic interactions. We predict the unsteady structural response of the membranes using a nonlinear, aeroelastic model—in excellent agreement with experimental measurements of deformations and force fluctuations. With simultaneous membrane interface tracking, force measurements and flow tracing, we reveal that a peculiar skewness in the membrane’s oscillations triggers turbulence production in the wake, thereby modulating the drag. The present work provides a demonstration of the complex interplay between soft materials and fluid turbulence, leading to new, emergent system properties.