Computation of vortex breakdown

Mudkavi, Vidyadhar (1994) Computation of vortex breakdown. In: CFD: Advances and Applications, 1994, India.

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Abstract

Vortex breakdown is a deceptively simple looking, complex and poorly understood phenomenon. According to Benjamin (1962), vortex breakdown or bursting is an abrupt and drastic change of structure which sometimes occurs in swirling flows. This phenomenon is commonly found to occur on leading edge vortices over delta wings and on trailing vortices in aircraft wakes. While it is necessary to prevent vortex breakdown over a delta wing, since it results in loss of lift, it is desirable to allow vortices to burst in aircraft wakes since it reduces hazard to follower aircraft. Vortex breakdown is also useful in chemically reacting flows where it is employed as a flame holder. But, more than anything, this phenomenon is studied because it is one of the basic problems in fluid dynamics. What follows is the authors own limited perspective of the problem. The reader will find that he/she is not introduced to the problem directly. Instead, a whole lot of material is devoted to the development of the equations of vortex dynamics with special emphasis on the motion of a vortex filament. The intention here is to motivate the reader about the merits of describing fluid flows using vortex elements as building blocks rather than velocity and pressure. Model equations of vortex breakdown are derived next using these equations. Other theoretical descriptions of the phenomenon are also stated, Benjamin's theory being of prime importance.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Flame holders;Fluid dynamics;Fluid flow;Reacting flow;Vortex breakdown;Vortex filaments;Vortices;Aircraft wakes; Computational fluid dynamics;Delta wings;Leading edges; Swirling
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Division/Department: Computational and Theoretical Fluid Dynamics Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 12 Oct 2006
Last Modified: 24 May 2010 09:51
URI: http://nal-ir.nal.res.in/id/eprint/2980

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