Computational Modeling and Analysis of the Coupled Aero Structural Dynamics in Bat Inspired Wings

TL;DR

This paper introduces a high-fidelity computational framework for simulating aero-structural interactions in bat-inspired wings, revealing how wing deformation and articulation influence aerodynamic performance and flow dynamics.

Contribution

It develops a novel simulation approach incorporating experimental joint movements to analyze complex wing deformations and their effects on aerodynamics in bat-inspired wings.

Findings

Vortex-induced pressure forces dominate aerodynamic loads.

Wing deformation significantly affects lift, drag, and thrust.

Articulation enhances aerodynamic efficiency compared to stiff wings.

Abstract

We employ a novel computational modeling framework to perform high-fidelity direct numerical simulations of aero-structural interactions in bat-inspired membrane wings. The wing of a bat consists of an elastic membrane supported by a highly articulated skeleton, enabling localized control over wing movement and deformation during flight. By modeling these complex deformations, along with realistic wing movements and interactions with the surrounding airflow, we expect to gain new insights into the performance of these unique wings. Our model achieves a high degree of realism by incorporating experimental measurements of the skeleton's joint movements to guide the fluid-structure interaction simulations. The simulations reveal that different segments of the wing undergo distinct aeroelastic deformations, impacting flow dynamics and aerodynamic loads. Specifically, the simulations show significant variations in the effectiveness of the wing in generating lift, drag, and thrust forces across different segments and regions of the wing. We employ a force partitioning method to analyze the causality of pressure loads over the wing, demonstrating that vortex-induced pressure forces are dominant while added mass contributions to aerodynamic loads are minimal. This approach also elucidates the role of various flow structures in shaping pressure distributions. Finally, we compare the fully articulated, flexible bat wing to equivalent stiff wings derived from the same kinematics, demonstrating the critical impact of wing articulation and deformation on aerodynamic efficiency.