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 nongradient-based multivariable optimization in order to optimize flapping kinematics and flexibility of the foil. The flapping kinematics is manipulated for a rigid nondeforming 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 modulus. 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.
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June 2019
Research-Article
Optimization of Biomimetic Propulsive Kinematics of a Flexible Foil Using Integrated Computational Fluid Dynamics–Computational Structural Dynamics Simulations
Jiho You,
Jiho You
Department of Mechanical Engineering,
Carnegie Mellon University,
Pittsburgh, PA 15213
Carnegie Mellon University,
Pittsburgh, PA 15213
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Jinmo Lee,
Jinmo Lee
Department of Mechanical Engineering,
Carnegie Mellon University,
Pittsburgh, PA 15213
Carnegie Mellon University,
Pittsburgh, PA 15213
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Seungpyo Hong,
Seungpyo Hong
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
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Donghyun You
Donghyun You
Associate Professor
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
e-mail: dhyou@postech.ac.kr
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
e-mail: dhyou@postech.ac.kr
Search for other works by this author on:
Jiho You
Department of Mechanical Engineering,
Carnegie Mellon University,
Pittsburgh, PA 15213
Carnegie Mellon University,
Pittsburgh, PA 15213
Jinmo Lee
Department of Mechanical Engineering,
Carnegie Mellon University,
Pittsburgh, PA 15213
Carnegie Mellon University,
Pittsburgh, PA 15213
Seungpyo Hong
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
Donghyun You
Associate Professor
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
e-mail: dhyou@postech.ac.kr
Department of Mechanical Engineering,
Pohang University of Science and Technology,
Pohang 37673, Gyeongbuk, South Korea
e-mail: dhyou@postech.ac.kr
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 6, 2018; final manuscript received September 12, 2018; published online December 24, 2018. Assoc. Editor: Shawn Aram.
J. Fluids Eng. Jun 2019, 141(6): 061106 (11 pages)
Published Online: December 24, 2018
Article history
Received:
April 6, 2018
Revised:
September 12, 2018
Citation
You, J., Lee, J., Hong, S., and You, D. (December 24, 2018). "Optimization of Biomimetic Propulsive Kinematics of a Flexible Foil Using Integrated Computational Fluid Dynamics–Computational Structural Dynamics Simulations." ASME. J. Fluids Eng. June 2019; 141(6): 061106. https://doi.org/10.1115/1.4041879
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