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The effect of compressibility on vortex pairing

The effect of compressibility on vortex pairing
The effect of compressibility on vortex pairing
Direct numerical simulations are conducted to investigate in detail the effect of Mach number on vortex pairing in a mixing layer. The pairing process is found to be delayed at higher Mach numbers and the paths followed by the vortices change. To investigate the effect of the initial shape of the vortices a simple vortex dynamical model of pairing is constructed which accurately models pairing at low Mach numbers. Results from the model suggest that a variation in the initial shape of the vortices is not sufficient to explain the changes in the pairing process due to Mach number. Further simulations are conducted for isolated vortex pairs. There is little departure from the expected rotation rate as Mach number is increased, but strong core effects. Overall, changes in the pairing process reflect changes in the evolution of the primary instability, with vortex trajectories becoming more elongated as the Mach number is increased
1070-6631
1063-1072
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97

Sandham, N.D. (1994) The effect of compressibility on vortex pairing. Physics of Fluids, 6, 1063-1072. (doi:10.1063/1.868339).

Record type: Article

Abstract

Direct numerical simulations are conducted to investigate in detail the effect of Mach number on vortex pairing in a mixing layer. The pairing process is found to be delayed at higher Mach numbers and the paths followed by the vortices change. To investigate the effect of the initial shape of the vortices a simple vortex dynamical model of pairing is constructed which accurately models pairing at low Mach numbers. Results from the model suggest that a variation in the initial shape of the vortices is not sufficient to explain the changes in the pairing process due to Mach number. Further simulations are conducted for isolated vortex pairs. There is little departure from the expected rotation rate as Mach number is increased, but strong core effects. Overall, changes in the pairing process reflect changes in the evolution of the primary instability, with vortex trajectories becoming more elongated as the Mach number is increased

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Published date: 1994

Identifiers

Local EPrints ID: 72044
URI: https://eprints.soton.ac.uk/id/eprint/72044
ISSN: 1070-6631
PURE UUID: b9a09b96-f56c-4732-8186-a30c43c36784
ORCID for N.D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

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Date deposited: 18 Jan 2010
Last modified: 06 Jun 2018 12:55

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Author: N.D. Sandham ORCID iD

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