Viscoelastic effects in the aeromechanics of actuated elastomeric membrane wings
Viscoelastic effects in the aeromechanics of actuated elastomeric membrane wings
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DOI：
10.1016/j.jfluidstructs.2016.01.003
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发表时间：
2016-05-01
影响因子：
3.6
通讯作者：
Palacios, Rafael
中科院分区：
文献类型：
--
作者：
Buoso, Stefano;Palacios, Rafael
本文通过数值模拟研究了粘弹效应对整体驱动薄膜机翼空气动力学的影响。为此目的，开发了一种由介电弹性体制成的机翼的高保真电气-航空力学计算模型。结构模型是基于几何非线性描述和非线性电粘弹性本构材料法。它是隐式耦合流体求解器的基础上的非定常Navier-Stokes方程的有限体积离散。由此产生的框架是用于被动和整体驱动膜翼的动力学评价在低雷诺数下超弹性和粘弹性假设的本构模型。数值模拟表明，粘弹性应力引入的阻尼可以显着降低膜振荡的振幅和修改耦合系统动力学的关键功能。估计的机翼性能指标与以前的实验观察结果吻合得很好，并表明需要包括率相关的影响，以正确地捕捉耦合系统的动态，特别是，对于高顺应性的膜。(C)2016年6月，作者。爱思唯尔有限公司出版
This work is a numerical investigation on the influence of viscoelastic effects on the aerodynamics of integrally actuated membrane wings. For that purpose, a high-fidelity electro-aeromechanical computational model of wings made of dielectric elastomers has been developed. The structural model is based on a geometrically non-linear description and a non-linear electro-viscoelastic constitutive material law. It is implicitly coupled with a fluid solver based on a finite-volume discretisation of the unsteady Navier-Stokes equations. The resulting framework is used for the evaluation of the dynamics of passive and integrally actuated membrane wings at low Reynolds numbers under hyperelastic and viscoelastic assumptions on the constitutive model. Numerical simulations show that the damping introduced by viscoelastic stresses can significantly reduce the amplitude of membrane oscillations and modify key features in the coupled system dynamics. The estimated wing performance metrics are in good agreement with previous experimental observations and demonstrate the need of including rate-dependent effects to correctly capture the coupled system dynamics, in particular, for highly compliant membranes. (C) 2016 The Authors. Published by Elsevier Ltd.