The wake flow past an axisymmetric body of revolution at a diameter-based Reynolds number $Re=u_{\infty }D/\nu =5000$ is investigated via direct numerical simulation. study focused on identification coherent vortical motions and the dominant frequencies in this flow. Three are identified wake: vortex shedding motion with frequency $St=fD/u_{\infty }=0.27$ , bubble pumping $St=0.02$ very-low-fre...

The expected flow asymmetry behind a three-dimensional notchback Ahmed body is numerically investigated using large-eddy simulations with different blockage ratios of 0%, 5%, 10%, and 20%. focus the study on natural bi-stable influenced by ratio. Although wake can be observed under ratio within 0%−10%, significant influence sensitive bi-stability indicated structures, pressure gradients, dynami...

To develop reliable computer models for the bluff body flow and transport of pollutants or chemical and biological (CB) agents in urban environments requires accurate measurements of the basic flow fields for carefully controlled, well-known conditions. Fluid modeling in an Industrial Wind Tunnel provides an opportunity to produce accurate simulations of the bluff body flow and transport of urb...

In this paper an energy harvesting system based on a piezoelectric converter to extract energy from airflow and use it to power battery-less sensors is presented. The converter is embedded as a part of a flexure beam that is put into vibrations by von Karman vortices detached from a bluff body placed upstream. The vortex street has been investigated by Computational Fluid Dynamics (CFD) simulat...

Experimental studies of plasma-assisted combustion have shown that Nanosecond Repetitively Pulsed (NRP) discharges are a very efficient way to improve flame stability in lean regimes. These generate non-equilibrium plasma induces local heating and an important production active species sufficient enhance the combustion. The aim this article is understand physical chemical mechanisms involved tu...

A numerical study on the response of a two-dimensional bluff body wake subjected to harmonic forcing imposed by two rear pitching flaps is performed. The generated rectangle at height-based Reynolds number $Re=100$ , characterised laminar vortex shedding. Two strategies are examined corresponding in-phase ‘snaking’ and out-of-phase ‘clapping.’ effects aspect ratio ( $AR=1,2,4$ ), flapping frequ...