Wakes of Maneuvering Body in Stratified Fluids

Voropayev, S. I.; Fernando, H. J. S.

doi:10.1007/978-3-642-12110-4_38

Cited by 8 publications

(10 citation statements)

References 8 publications

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“…When eddies with incident scale k À1 I moving with velocity u 0 are advected by large scale eddies (L) towards the interface they are flattened and develop large gradients normal to the interface, as seen in the two-dimensional laboratory study by Voropayev and Fernando (2010) (Fig. 1b).…”

Section: How Blocking By Thin Shear Layers Leads To the Inertial Sub-mentioning

confidence: 94%

“…This produces large scale gradients which distort the eddies whichever side they may be on. For example, near stagnation points there are strong local distortions leading to local spectra of the form of (1), (Voropayev and Fernando, 2010). As explained below in Sec.…”

Section: How Blocking By Thin Shear Layers Leads To the Inertial Sub-mentioning

confidence: 95%

“…More recently, idealized analyses of the interactions between eddies and straining flows on the one hand, and with shear layers on the other hand show how thin shear layers within turbulence can have a critical role in the transfer of energy between large and small scale motions in two and three dimensional turbulence Voropayev and Fernando, 2010). These mechanisms and scaling results are only relevant for analyzing the structure of homogeneous turbulence wherever larger scale eddies determine the distribution of smaller scales.…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Thin shear layers – The key to turbulence structure?

Hunt

Eames

Westerweel

et al. 2010

Journal of Hydro-environment Research

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Section: How Blocking By Thin Shear Layers Leads To the Inertial Sub-mentioning

confidence: 94%

Section: How Blocking By Thin Shear Layers Leads To the Inertial Sub-mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Thin shear layers – The key to turbulence structure?

Hunt

Eames

Westerweel

et al. 2010

Journal of Hydro-environment Research

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“…Only recently have remote-controlled submersibles been used to represent a true self-propelled wake, e.g. Voropayev et al (2007) and Voropayev & Fernando (2010).…”

Section: Introductionmentioning

confidence: 99%

“…After a long hiatus, self-propelled wakes were investigated recently in laboratory experiments that employed modern diagnostics by . Voropayev et al (1999) and Voropayev & Fernando (2010) also investigated self-propelled wakes, although their studies emphasized the effect of acceleration manoeuvres on the formation of large eddies in the late wake of a self-propelled body. Direct numerical simulation (DNS) was used by to compare self-propelled and towed wakes at a Reynolds number of 50 000.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a propelled wake with moderate excess momentum in a stratified fluid

Stadler

Sarkar

2011

J. Fluid Mech.

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Direct numerical simulation is used to simulate the turbulent wake behind an accelerating axisymmetric self-propelled body in a stratified fluid. Acceleration is modelled by adding a velocity profile corresponding to net thrust to a self-propelled velocity profile resulting in a wake with excess momentum. The effect of a small to moderate amount of excess momentum on the initially momentumless self-propelled wake is investigated to evaluate if the addition of excess momentum leads to a large qualitative change in wake dynamics. Both the amount and shape of excess momentum are varied. Increasing the amount of excess momentum and/or decreasing the radial extent of excess momentum was found to increase the defect velocity, mean kinetic energy, shear in the velocity gradient and the wake width. The increased shear in the mean profile resulted in increased production of turbulent kinetic energy leading to an increase in turbulent kinetic energy and its dissipation. Slightly larger vorticity structures were observed in the late wake with excess momentum although the differences between vorticity structures in the self-propelled and 40 % excess momentum cases was significantly smaller than suggested by previous experiments. Buoyancy was found to preserve the doubly inflected velocity profile in the vertical direction, and similarity for the mean velocity and turbulent kinetic energy was found to occur in both horizontal and vertical directions. While quantitative differences were observed between cases with and without excess momentum, qualitatively similar evolution was found to occur.

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