Experiments on the generation of internal waves in a stratified fluid

Gilreath, H. E.; Brandt, Alan

doi:10.2514/6.1983-1704

Cited by 11 publications

(28 citation statements)

References 6 publications

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“…Waves associated with wake collapse, that is, due to a decrease in the vertical dimension of the wake, as observed by Gilreath and Brandt (1985), were not observed in the present experiments. No clear shrinkage of the wake of the sphere was in fact manifest.…”

Section: (5)contrasting

confidence: 47%

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Internal waves generated by a moving sphere and its wake in a stratified fluid

Hopfinger

Flór

Chomaz

et al. 1991

Experiments in Fluids

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The internal gravity waves and the turbulent wake of a sphere moving through stratified fluid were studied by the fluorescent dye technique. The Reynolds number Re = U. 2 a/v was kept nearly constant at about 3 9 10 3 and the Froude number F = U/a N ranged from 0.5 to 12.5. It is observed that waves generated by the body are dominant only when F< 4 and are replaced by waves generated by the large scale coherent structures of the wake when F>4.

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Section: (5)contrasting

confidence: 47%

“…Only Gilreath and Brandt (1985) seem to have studied the lee * Present address: Institute of Metereology and Oceanography, University of Utrecht, P.O.B. 80.005, 3508 Utrecht waves and also the short, random internal waves produced by a self-propelled and towed elliptical body and its wake.…”

Section: Introductionmentioning

confidence: 99%

Internal waves generated by a moving sphere and its wake in a stratified fluid

Hopfinger

Flór

Chomaz

et al. 1991

Experiments in Fluids

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“…Some pertinent examples are the wakes of submarines moving through a thermocline (Gilreath and Brandt 1985), air flow past mountains (Brighton 1978;Castro et al 1983), ocean currents past such natural submarine features as seamounts and man-made underwater structures and the motion of aircraft in the stratosphere. One distinctive feature of stratified turbulent wakes is the coexistence of the turbulence with a field of internal gravity waves excited by the interaction between (i) the body and the stratified fluid (body-generated waves) or (ii) the wake itself and the background stratification (wake-generated waves).…”

Section: Introductionmentioning

confidence: 99%

“…Schooley and Hughes (1972) studied the problem of internal waves generated by the collapse of a two-dimensional mixed region in stratified fluids. Gilreath and Brandt (1985) discussed the problem of wave generation behind self-propelled bodies. They used ensemble averaged conductivity probe records to study the resulting random field of internal waves (both due to the body and the propeller), and pointed out that linear theory suffered major shortcomings.…”

Section: Introductionmentioning

confidence: 99%

Internal waves generated by the turbulent wake of a sphere

Lin

Boyer

Fernando

1993

Experiments in Fluids

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Internal waves generated by the turbulent wake of a sphere travelling horizontally through a linearly stratified fluid were studied using shadowgraph and particle-streak photography. The Reynolds and internal Froude number ranges considered were 2,000 < Re < 12,900 and 2.0 < Fi < 28.0, respectively. Two quite distinct flow regimes based on the structure of the turbulent wake were identified. In one, the wake is characterized by "large-scale coherent structures". In the other, the wake, as viewed on a side-view shadowgraph, grows in a roughly symmetric fashion to a maximum height and then collapses slowly; such flows are termed the "smallscale structures" regime.Wave lengths and maximum wave heights of the internal waves were measured as functions of Nt and Fi, where N is the Brunt-V/iis/il/i frequency and t the time. It was found that the wave lengths scale well with the streamwise dimension of the spiralling coherent structures. The maximum amplitude of the internal waves were found to scale with the vertical dimension of the turbulent wake, upon varying the internal Froude number.

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“…Much less is known of stratified wakes produced by self-propelled vehicles. In spite of the technical difficulties in modeling such wakes in the laboratory, some data has been obtained but mostly on the near wake characteristics and only for steady motion [8,14,15].…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Modeling and Control of Large Eddies Generated by Maneuvering Self-Propelled Bodies in Stratified Fluids

Voropayev¹,

Boyer²

2001

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Experiments on the generation of internal waves in a stratified fluid

Cited by 11 publications

References 6 publications

Internal waves generated by a moving sphere and its wake in a stratified fluid

Internal waves generated by a moving sphere and its wake in a stratified fluid

Internal waves generated by the turbulent wake of a sphere

Modeling and Control of Large Eddies Generated by Maneuvering Self-Propelled Bodies in Stratified Fluids

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