Efficient foil propulsion through vortex control

We investigate the problem of a heaving and pitching hydrofoil in an inflow that consists of a uniform velocity field and a staggered array of vortices. The foil can exploit the energy in such a Karman vortex street for efficient propuls...

K Streitlien，GS Triantafyllou，MS Triantafyllou - 《Aiaa Journal》

Edge, cavity and aperture tones at very low Mach numbers

The linear theory is developed of self‐sustained oscillations of shear layers and jets incident on edges and corners at infinitesimal Mach number. These o...

HOWE，S M. - 《Journal of Fluid Mechanics》

Experimental and Numerical Investigation of Flow Oscillations in a Rectangular Cavity

The unsteady, incompressible, moderate Reynolds number flow past a rectangular cavity is experimentally and numerically investigated. Laser-Doppler anemome...

JCF Pereira，JMM Sousa - 《Journal of Fluids Engineering》

Wind-tunnel studies of F/A-18 tail buffet

A wind-tunnel investigation of buffeting on the vertical fin of a rigid 6% model of the F/A-18 has been conducted in the Institute for Aerospace Research 5...

BHK Lee，D Brown - 《Journal of Aircraft》

Instantaneous pressure fields at a corner associated with vortex impingement

The distortion of vortices incident upon a corner is visualized using the dye-injection technique, and, simultaneously, the instantaneous pressure fields are measured using a rotating-disk arrangement. Depending on the transverse offset ...

Tang, Y.-P.，D Rockwell - 《Journal of Fluid Mechanics》

The boundary-layer flow due to a vortex approaching a cylinder

The three-dimensional unsteady boundary layer induced by a vortex filament moving outside a circular cylinder is considered. In the present paper, we focus...

H Affes，Z Xiao，AT Conlisk - 《Journal of Fluid Mechanics》

Active control of a mixing layer by upstream influence from an oscillating edge

A mixing layer having finite length impinges on a downstream oscillating leading edge. Several classes of modulation of the upstream vortex development and its interaction with the edge are produced. At excitation frequencies, e, relati...

CR Kaykayolu - 《Journal of Fluids & Structures》

Concepts for reduction of blade-vortex interaction noise

A model is developed to determine the critical parameters that control noise generation by blade-vortex interaction (BVI). The equations for evaluation BVI are derived. The analysis of BVI using the model reveals that the interaction is ...

JC Hardin，SL Lamkin - 《Journal of Aircraft》

Vortex dipoles impinging on circular cylinders

Vortex pairs interacting with a circular cylinder have been simulated by the numerical simulation of the two‐dimensional Navier–Stokes equation in the vo...

Orlandi，P. - 《Physics of Fluids A Fluid Dynamics》

Response of the cavity shear layer oscillations to external forcing

The influence of externally forced initial flow conditions on axisymmetric cavity shear layer was studied. A sinusoidally heated strip upstream of the cavity excited Tollmien-Schlichting waves that, after amplification by the boundary la...

GHARIB，M. - 《Aiaa Journal》