Secondary instability in variable-density round jets

Joseph W. Nichols; Jean Marc Chomaz; Peter J. Schmid

doi:10.1007/978-3-540-72604-3_9

Secondary instability in variable-density round jets

Joseph W. Nichols, Jean Marc Chomaz, Peter J. Schmid

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

Side jet formation in variable-density round jets is investigated by means of direct numerical simulation (DNS) and linear stability analysis. From DNS, it is observed that a light jet with density ratio S = ρ0/ ρj = 4 supports sustained side jets which eject fluid from the center of the jet in a star-shaped pattern. These side jets persist over an axial distance of approximately 5 jet diameters before the jet transitions to turbulence, and do not precess around the jet. It is conjectured that this behavior can be explained by a change in the local properties of the secondary instability from convective to absolute in nature. This hypothesis is tested by examining the spatio-temporal development of the wavepacket resulting from a small impulse, taken about a non-diffusing periodic base state corresponding to the saturated primary instability.

Original language	English (US)
Title of host publication	Advances in Turbulence XI - Proceedings of the 11th EUROMECH European Turbulence Conference
Publisher	Springer [email protected]
Pages	32-34
Number of pages	3
ISBN (Print)	9783540726036
DOIs	https://doi.org/10.1007/978-3-540-72604-3_9
State	Published - Jan 1 2007
Externally published	Yes

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10.1007/978-3-540-72604-3_9

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title = "Secondary instability in variable-density round jets",

abstract = "Side jet formation in variable-density round jets is investigated by means of direct numerical simulation (DNS) and linear stability analysis. From DNS, it is observed that a light jet with density ratio S = ρ0/ ρj = 4 supports sustained side jets which eject fluid from the center of the jet in a star-shaped pattern. These side jets persist over an axial distance of approximately 5 jet diameters before the jet transitions to turbulence, and do not precess around the jet. It is conjectured that this behavior can be explained by a change in the local properties of the secondary instability from convective to absolute in nature. This hypothesis is tested by examining the spatio-temporal development of the wavepacket resulting from a small impulse, taken about a non-diffusing periodic base state corresponding to the saturated primary instability.",

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AU - Nichols, Joseph W.

AU - Chomaz, Jean Marc

AU - Schmid, Peter J.

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PY - 2007/1/1

Y1 - 2007/1/1

N2 - Side jet formation in variable-density round jets is investigated by means of direct numerical simulation (DNS) and linear stability analysis. From DNS, it is observed that a light jet with density ratio S = ρ0/ ρj = 4 supports sustained side jets which eject fluid from the center of the jet in a star-shaped pattern. These side jets persist over an axial distance of approximately 5 jet diameters before the jet transitions to turbulence, and do not precess around the jet. It is conjectured that this behavior can be explained by a change in the local properties of the secondary instability from convective to absolute in nature. This hypothesis is tested by examining the spatio-temporal development of the wavepacket resulting from a small impulse, taken about a non-diffusing periodic base state corresponding to the saturated primary instability.

AB - Side jet formation in variable-density round jets is investigated by means of direct numerical simulation (DNS) and linear stability analysis. From DNS, it is observed that a light jet with density ratio S = ρ0/ ρj = 4 supports sustained side jets which eject fluid from the center of the jet in a star-shaped pattern. These side jets persist over an axial distance of approximately 5 jet diameters before the jet transitions to turbulence, and do not precess around the jet. It is conjectured that this behavior can be explained by a change in the local properties of the secondary instability from convective to absolute in nature. This hypothesis is tested by examining the spatio-temporal development of the wavepacket resulting from a small impulse, taken about a non-diffusing periodic base state corresponding to the saturated primary instability.

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U2 - 10.1007/978-3-540-72604-3_9

DO - 10.1007/978-3-540-72604-3_9

M3 - Conference contribution

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SP - 32

EP - 34

BT - Advances in Turbulence XI - Proceedings of the 11th EUROMECH European Turbulence Conference

PB - Springer [email protected]

ER -

Secondary instability in variable-density round jets

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