The free vibrations of a flexible circular cylinder inclined at 80° within a uniform current are investigated by means of direct numerical simulation, at Reynolds number 500 based on the body diameter and inflow velocity. In spite of the large inclination angle, the cylinder exhibits regular in-line and cross-flow vibrations excited by the flow through the lock-in mechanism, i.e. synchronizatio...

Three-dimensional flows over impulsively translated low-aspect-ratio flat plates are investigated for Reynolds numbers of 300 and 500, with a focus on the unsteady vortex dynamics at post-stall angles of attack. Numerical simulations, validated by an oil tow-tank experiment, are performed to study the influence of aspect ratio, angle of attack and planform geometry on the wake vortices and the ...

Flow-induced noise from fully submerged lifting bodies experiencing turbulent trailing edge flows continues to pose undesirable effects for many marine propulsion systems and control surfaces.This noises arises from unsteady oscillatory flow has been shown to be highly dependent on trailing edge geometry, which can also lead to unacceptable structural vibrations. This paper presents a numerical...

The flow past a square cylinder under the influence of one dimensional gust was investigated using computational fluid dynamics (CFD). effect upstream wind gusts same amplitude but different duration with respect to their on flow, vortex-shedding, and pressure distribution around cylinder. For computations, very large eddy simulation (VLES) model implemented in an in-house code validated agains...

A quasi three-dimensional numerical model is developed to study vortex-induced vibration (VIV) of two tandem flexible circular cylinders. In this model, the whole cylinder is divided into many sections along its length. The hydrodynamics of each section are represented by the solution of the two-dimensional Navier-Stokes equations. The dynamic response of the flexible cylinder is predicted by t...

A three-dimensional simulation of hovering flapping wings was performed using an immersed boundary method. This was done to investigate the effects of chordwise wing deformation on three important unsteady aerodynamic mechanisms found in flapping flight, namely Leading Edge Vortex (LEV) shedding, wake capture and clap and fling. A wing was modeled as a flat plate, flapping close to a symmetry p...

This article presents the investigation on the vortex formation and shedding process behind a heated cylinder which is exposed to a cold cross flow. The Reynolds number is chosen to be 75 while the Grashof number is varied between 0 and 5000 (resulting in a variation from forced to mixed convection). The numerical results show that the addition of heat disturbs the vortex formation process. The...

The present work is aimed at the development of a robust, computationally efficient algorithm for the simulation of unsteady incompressible flows of interest in engineering. In particular, we focus on the extension of a fully-implicit multigr~d driven algorithm, orig/nally proposed and vaJhdated for both the two-dimensional Euler and Navier-Stokes equations in references [1,2], to three dimensi...