Lattice Boltzmann equation simulation of rectangular jet (AR=1.5) instability and axis-switching

Huidan Yu and Sharath S. Girimaji

Physica A: Statistical Mechanics and its Applications, 2006, vol. 362, issue 1, 151-157

Abstract: We investigate the axis-switching and instability onset characteristics of a rectangular jet with aspect ratio (AR) of 1.5. Jet flow simulations of four different Reynolds numbers, 10,100,150, and 200, are performed. Half-width of streamwise velocity along with velocity vector and streamwise vorticity on transverse planes at different downstream locations are examined. The simulation results show the following instability characteristics: (i) At relatively low Reynolds numbers (10 and 100), the jet flow is laminar and stable; (ii) At Re=150, the flow is still laminar and stable but axis-switching occurs with downstream distance; and (iii) At Re=200, the jet flow becomes unstable but the axis-switching is still seen roughly. Instability first originates near the jet orifice and then propagates down the stream.

Keywords: Lattice Boltzmann equation; Rectangular jet; Axis-switching; Instability (search for similar items in EconPapers)
Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:362:y:2006:i:1:p:151-157

DOI: 10.1016/j.physa.2005.09.035

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