Direct numerical simulation of supersonic jet flow


Luo, K.H. and Sandham, N.D. (1997) Direct numerical simulation of supersonic jet flow. Journal of Engineering Mathematics, 32, (2-3), 121-142. (doi:10.1023/A:1004244715140).

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Original Publication URL: http://dx.doi.org/10.1023/A:1004244715140

Description/Abstract

A numerical method is given for direct numerical simulation of the nonlinear evolution of instability
waves in supersonic round jets, with spatial discretisation based on high-order compact finite differences. The
numerical properties of a class of symmetric and asymmetric schemes are analysed. Implementation for the
Navier–Stokes equations in cylindrical polar coordinates is discussed with particular attention given to treatment
of the origin to ensure stability and efficiency. Validation of the schemes is carried out by detailed comparison with
linear stability theory. The computer code is applied to study the initial stages of nonlinear development of unstable
modes in a Mach 3 jet. The modes of instability that are present include strongly unstable axisymmetric acoustic
and helical vortical waves, as well as weakly unstable radiating acoustic and vortical modes. Three distinctive
wave patterns are observed from the simulations including a cross-hatched internal shock structure. Nonlinear
interactions between the vortical and acoustic modes are investigated

Item Type: Article
ISSNs: 0022-0833 (print)
Related URLs:
Keywords: dns, jets, supersonics, finite differences, shocks
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 72006
Date Deposited: 14 Jan 2010
Last Modified: 27 Mar 2014 18:51
URI: http://eprints.soton.ac.uk/id/eprint/72006

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