1503 波状変形する翼型による流れと推力について

概要

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Unsteady viscous flow field around a fish-like advancing wing is numerically studied. The main objective is to study the abilities of a deforming body to produce thrust and achieve higher propulsive efficiency in viscous flow field. The Reynolds numbers based on the oncoming velocity and the body length range from 10^3 to (10)^6. The flow is simulated by solving two-dimensional unsteady Navier-Stokes equation in a primitive value formulation, while the eddy-viscosity is described by algebraic model. The simulation shows that pressure is acting as thrusting force while frictional force is acting as resistance during the undulating motion. Thrust goes up with the increase of phase velocity of undulating wave. In the case of laminar flow, the frictional force enlarges with the increase of phase velocity. While in the case of turbulent flow, the increase of phase velocity can suppress turbulence accompanying with the decrease of frictional force.
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