A Reconciliation of Viscous and Inviscid Approaches to Computing Locomotion of Deforming Bodies |
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Authors: | J D Eldredge |
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Institution: | (1) Mechanical & Aerospace Engineering, University of California, Los Angeles, CA 90095, USA |
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Abstract: | We present a formulation for coupled solutions of fluid and body dynamics in problems of biolocomotion. This formulation unifies
the treatment at moderate to high Reynolds number with the corresponding inviscid problem. By a viscous splitting of the Navier–Stokes
equations, inertial forces from the fluid are distinguished from the viscous forces, and the former are further decomposed
into contributions from body motion in irrotational fluid and ambient fluid vorticity about an equivalent stationary body.
In particular, the added mass of the fluid is combined with the intrinsic inertia of the body to allow for simulations of
bodies of arbitrary mass, including massless or neutrally buoyant bodies. The resulting dynamical equations can potentially
illuminate the role of vorticity in locomotion, and the fundamental differences of locomotion in real and perfect fluids. |
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Keywords: | |
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