Coherent Structures in the Similarity Region of Two-Dimensional Turbulent Jets

Oler, J. W.; Goldschmidt, Victor

doi:10.1115/1.3243097

Cited by 20 publications

(10 citation statements)

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“…Wygnanski & Petersen (1987) have noted that the linear modes of instability in the wake are the same as in the plane jet (mean velocity profiles in both flows have two inflection points). The topological information obtained by and the measurements of Oler & Goldschmidt (1981, 1982 and Thomas & Goldschmidt (1986) support the existence of an alternating pattern in the far field of the plane jet, as in the far wake.…”

Section: Introductionmentioning

confidence: 61%

Spatial organization of large structures in the turbulent far wake of a cylinder

1990

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Using an array of ×-probes aligned in the plane of mean shear in the turbulent far wake of a circular cylinder, instantaneous velocity vector patterns are obtained from which stream-function approximations and sectional streamlines are derived. Conditional patterns obtained using different methods for detecting the organized motion are essentially independent of the particular method used. The spatial arrangement of the organized motion about the flow centreline varies in a continuous manner between opposing and alternating modes, the latter being nearly twice as common as the former. Results presented include conditional patterns for the opposing and alternating modes and the relative contributions made by each mode to the Reynolds stresses. A modified Rankine vortex kinematic model, based as much as possible on experimental data and incorporating both modes, yields mean velocity and Reynolds stress distributions which agree well with experiment. A quasi-three-dimensional version of the model implies that large spanwise vortices and shear-aligned double rollers represent the same three-dimensional organized motion from two different viewpoints.

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Section: Introductionmentioning

confidence: 61%

Spatial organization of large structures in the turbulent far wake of a cylinder

1990

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“…Many experimental studies and results are available on jets. [1][2][3][4][5][6][7][8][9][10][11][12][13] Characteristics in the near field of the jet nozzle as well as in the self-preservation region have been investigated. Large statistical structures are seen, especially in the near field, that include a Von Karman vortex street and rollerlike structures.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of a plane jet

1999

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Articles you may be interested in Assessment of subgrid-scale models with a large-eddy simulation-dedicated experimental database: The pulsatile impinging jet in turbulent cross-flow Phys. Fluids 26, 075108 (2014); 10.1063/1.4890855 Large-eddy simulation of highly underexpanded transient gas jets Phys. Fluids 25, 016101 (2013); 10.1063/1.4772192 Large-eddy simulation of the flow and acoustic fields of a Reynolds number 10 5 subsonic jet with tripped exit boundary layers Phys. Fluids 23, 035104 (2011); 10.1063/1.3555634 On using large-eddy simulation for the prediction of noise from cold and heated turbulent jets

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“…Flora & Goldschmidt 1969;Hussain & Clark 1977 ;Goldschmidt & Bradshaw 1981) or room turbulence (Bradshaw 1977). More recently, attention has turned (Mumford 1982 ;Oler & Goldschmidt 1981 ; Antonia et al 19833) towards identifying the presence and properties of the organized large-structure of the flow, primarily through space-time correlation measurements. On the basis of flow-visualization results and quantitative measurements, Gold-Schmidt, Moallemi & Oler (1983) have suggested that a pattern of spanwise eddies, somewhat reminiscent of a Karman vortex street, accounts for the flapping-like motion of the flow and for the regions of flow reversal which occur in the outer part of the jet.…”

Section: Introductionmentioning

confidence: 99%

The interaction region of a turbulent plane jet

1984

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All three velocity fluctuations and the temperature fluctuation have been measured in a slightly heated turbulent plane jet. Attention is focused on the interaction region of the flow, which is situated between the location where the two mixing layers nominally merge and that which corresponds to approximate self-preservation.For the jet considered here the mixing-layer structures are symmetrical with respect to the centreline, and when they meet in the interaction region the redistribution of turbulence quantities is dramatic. This redistribution is examined in detail. Also examined is the effect of the generation, in the interaction region, of new structures, asymmetric with respect to the centreline, which evolve into the self-preserving flow region downstream.Turbulence parameters, such as the turbulent Prandtl number, probability density functions, skewness and flatness factors, are also presented, primarily to guide computer simulations of this flow. The superposition procedure of Weir, Wood & Bradshaw (1981), which assumes that the turbulence structure of each mixing layer is not significantly altered by the interaction, is not appropriate to the present flow.

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Coherent Structures in the Similarity Region of Two-Dimensional Turbulent Jets

Cited by 20 publications

References 0 publications

Spatial organization of large structures in the turbulent far wake of a cylinder

Spatial organization of large structures in the turbulent far wake of a cylinder

Large eddy simulation of a plane jet

The interaction region of a turbulent plane jet

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