Numerical investigation of unsteady vortex breakdown past 80°/65° double-delta wing

Numerical Simulation of Vortex Breakdown by the Vortex-Filament Method

Direct measurement of delta wing vortex circulation using ultrasound

The circulation around a closed path encompassing the primary vortex of stationary delta wings is investigated through the use of ultrasound. Ultrasonic pulses were propagated clockwise and counterclockwise along a fixed, closed path which was positioned perpendicular to the delta wing root chord lines. Circulation in the plane of the closed path was then determined from the transit time differ...

The leading-edge vortex of swift wing-shaped delta wings

Recent investigations on the aerodynamics of natural fliers have illuminated the significance of the leading-edge vortex (LEV) for lift generation in a variety of flight conditions. A well-documented example of an LEV is that generated by aircraft with highly swept, delta-shaped wings. While the wing aerodynamics of a manoeuvring aircraft, a bird gliding and a bird in flapping flight vary signi...

Numerical Investigation of Vortex Interaction in Pipe Flow

To discover the nonlinear characteristics of pipe flow, we simulated the flow as a sum of many vortex rings. As a first step, we investigated the nonlinear interaction among a maximum of three vortex rings. The pipe wall was replaced by many bound vortices. A free vortex ring moves right or left according to the radius, and that of a particular radius keeps the initial position. The energy of a...

A numerical study of vortex dynamics of flexible wing propulsors

The dynamic properties such as time dependent pressure loading, speed, free stream velocity, and local acceleration of the hydrofoil determine the instantaneous deformation of the hydrofoil, which has effect on the propulsive characteristics of the aquatic animal. A potential flow analysis is done on the flexible hydrofoil, to evaluate the both inertial and elastic effects on propulsive charact...