Optimal tail kinematicsunsteady vortexfor fish-likelattice methodlocomotion using the Unsteady Vortex Lattice Method

Ahmed A. Hussein, Saad Ragab, Haithem E. Taha, Muhammad R. Hajj

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The design of fish-like swimmers depends on understanding the interaction between the fluid motion and the body dynamics of the fish. Towards this objective, the optimal motion of the fish – tail is sought. As a simplified assumptions, the base body is assumed to be an elliptic shape while the tail is approximated as an Euler-Bernoulli beam. Three cases for the tail motion are considered in this paper. The first, second, and the third case are defined respectively as rigid beam, flexible beam in which the flexible motion is assumed to be a linear superposition of simple harmonic motions that have the shapes as the first and the second normal modes of the tail, and a flexible beam in which the flexible motion of the tail is determined by solving the fluid-structure coupled problem. In all three cases the input to the tail is pitching rotation at the root is to be determined by minimizing the hydrodynamic power subjected to zero net thrust on the fish body. The unsteady hydrodynamic loads are calculated using the two-dimensional unsteady vortex lattice method. The aim of the study is to investigate the effect of the tail active and passive flexibility on the propulsive efficiency versus the rigid tail.

Original languageEnglish
Title of host publicationAIAA Aerospace Sciences Meeting
DOIs
StatePublished - 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: 8 Jan 201812 Jan 2018

Publication series

NameAIAA Aerospace Sciences Meeting, 2018

Conference

ConferenceAIAA Aerospace Sciences Meeting, 2018
Country/TerritoryUnited States
CityKissimmee
Period8/01/1812/01/18

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