Volume : II, Issue : VIII, August - 2013

Fundamental Control of Wake Behind Bluff Bodies : A Review

Dalbir Singh, M. M. Gaud, Jaswinder Singh

Abstract :

When a body and fluid have relative motion in between them, they experience ‘drag’, the force which resists this relative motion. Particularly in aeronautics and automotive research, drag reduction is the most investigated topic. In the sub-sonic range total drag force exerted on a body is the sum of skin friction and pressure drag. For a streamlined body 85-90% of the drag is from skin friction while for a bluff body 80-85% of the drag is due to pressure drag. Additionally, the shear layers of the separated flow tend to be unstable, and concentration of vortices results in huge vortices in the wake. Because of this unsteadiness the drag forces are also unsteady with respect to magnitude and direction, thus generating viations of the body. An enhanced comprehension of the fluid mechanics around and behind bluff bodies as well as its effect when applying different control methods is essential in order to develop more safety, more energy efficient, and adapted design within many areas of practical application.. In this research a passive method of wake reduction is encapsulated in which a duct connects the frontal high pressure region of the bluff body with the low pressure region at the rear. This method is studied and investigated using CFD.

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Dalbir Singh, M.M. Gaud, Jaswinder Singh Fundamental Control of Wake Behind Bluff Bodies : A Review International Journal of Scientific Research, Vol : 2, Issue : 8 August 2013

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