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A. Sedaghat, S. Mokhtarian, Numerical Simulation of Rayleigh-Taylor Instability, Int J Advanced Design and Manufacturing Technology, Vol. 6/ No. 1/ March - 2013.

Numerical Simulation of Rayleigh-Taylor Instability
 
A. Sedaghat*
Department of Mechanical Engineering,
Isfahan University of Technology, Isfahan, Iran
*Corresponding author
 
S. Mokhtarian
Department of Mechanical Engineering,
Isfahan University of Technology, Isfahan, Iran
 
Received: 13 November 2011, Revised: 19 May 2012, Accepted: 23 July 2012
 
Abstract
Rayleigh-Taylor (RT) instability has a growing importance in many fields including aircraft industry and astrophysics. The development and the growth of RT instability were investigated using sinusoidal disturbances with different wavelength at the interface of the two fluids. Numerical simulations were performed by solving Navier-Stokes unsteady equations with the VOF formulation. Results of the 2D simulation are compared with experimental results. It is shown that beyond a critical time, not captured experimentally, the mushroom shape of RT instability turns into a helical path or breaks down into a patchy shape depending on the shape of disturbance. Nonlinear instabilities responsible for such behaviour are apparent when the wavelength exceeds 10 times the length scale introduced in this study.
 
Keywords: Hydrodynamic Instabilities, Multi-Phase Flow, Rayleigh-Taylor
 
Journal Papers
Month/Season: 
July
Year: 
2013