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research-article

Optimization of Biomimetic Propulsive Kinematics of a Flexible Foil Using Integrated CFD-CSD Simulations

[+] Author and Article Information
Jiho You

Graduate Research Assistant, Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
jiho1125@gmail.com

Jinmo Lee

Graduate Research Assistant, Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
jm.lee@hyundai.com

Seungpyo Hong

Graduate Research Assistant, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Korea
kriswow2@gmail.com

Donghyun You

Associate Professor, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Korea
dhyou@postech.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4041879 History: Received April 06, 2018; Revised September 12, 2018

Abstract

A computational methodology, which combines a computational fluid dynamics (CFD) technique and a computational structural dynamics (CSD) technique, is employed to design a deformable foil whose kinematics is inspired by the propulsive motion of the fin or the tail of a fish or a cetacean. The unsteady incompressible Navier-Stokes equations are solved using a second-order accurate finite-difference method and an immersed-boundary method to effectively impose boundary conditions on complex moving boundaries. A finite-element-based structural dynamics solver is employed to compute the deformation of the foil due to interaction with fluid. The integrated CFD-CSD simulation capability is coupled with a surrogate management framework (SMF) for non-gradient-based multivariable optimization in order to optimize flapping kinematics and flexibility of the foil. The flapping kinematics is manipulated for a rigid non-deforming foil through the pitching amplitude and the phase angle between heaving and pitching motions. The flexibility is additionally controlled for a flexible deforming foil through the selection of material with a range of Young's moduli. A parametric analysis with respect to pitching amplitude, phase angle, and Young's modulus on propulsion efficiency is presented at Reynolds number of 1100 for the NACA 0012 airfoil.

Copyright (c) 2018 by ASME
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