Two-dimensional turbulence on a bounded domain : the role of angular momentum

Onderzoeksoutput: Bijdrage aan congresOther

Uittreksel

In contrast to its counterpart in the 3D world, turbulence in 2D is characterized by an inverse energy cascade. The presence of this inverse cascade in 2D turbulence is visible in the so-called self-organization of such flows: larger vortices and structures are observed to emerge from initially random flow fields. The lecture will address the evolution of 2D turbulent flows on a finite domain with no-slip walls. The organized state consists of a large, domain-filling cell whose motion can be considered as inviscid. Results of both laboratory experiments in rotating / stratified fluids and numerical simulations, however, reveal the crucial role played by the unsteady boundary layers: the domain boundaries act as important sources of large-amplitude vorticity filaments that may influence the motion in the interior. Attention will be given to global flow quantities like the kinetic energy, the enstrophy, and the total angular momentum. In the case of forced 2D turbulence, the latter quantity may show a remarkable flip-flopping behaviour, associated with a collapse of the organized flow state followed by its re-organisation.
Originele taal-2Engels
StatusGepubliceerd - 2009
Evenementconference; Mexican Physical Society; 2009-10-26; 2009-10-26 -
Duur: 26 okt 200926 okt 2009

Congres

Congresconference; Mexican Physical Society; 2009-10-26; 2009-10-26
Periode26/10/0926/10/09
AnderMexican Physical Society

Vingerafdruk

angular momentum
turbulence
vorticity
cascades
lectures
turbulent flow
boundary layers
filaments
flow distribution
slip
kinetic energy
vortices
fluids
cells
simulation
energy

Citeer dit

Heijst, van, G. J. F. (2009). Two-dimensional turbulence on a bounded domain : the role of angular momentum. conference; Mexican Physical Society; 2009-10-26; 2009-10-26, .
Heijst, van, G.J.F. / Two-dimensional turbulence on a bounded domain : the role of angular momentum. conference; Mexican Physical Society; 2009-10-26; 2009-10-26, .
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title = "Two-dimensional turbulence on a bounded domain : the role of angular momentum",
abstract = "In contrast to its counterpart in the 3D world, turbulence in 2D is characterized by an inverse energy cascade. The presence of this inverse cascade in 2D turbulence is visible in the so-called self-organization of such flows: larger vortices and structures are observed to emerge from initially random flow fields. The lecture will address the evolution of 2D turbulent flows on a finite domain with no-slip walls. The organized state consists of a large, domain-filling cell whose motion can be considered as inviscid. Results of both laboratory experiments in rotating / stratified fluids and numerical simulations, however, reveal the crucial role played by the unsteady boundary layers: the domain boundaries act as important sources of large-amplitude vorticity filaments that may influence the motion in the interior. Attention will be given to global flow quantities like the kinetic energy, the enstrophy, and the total angular momentum. In the case of forced 2D turbulence, the latter quantity may show a remarkable flip-flopping behaviour, associated with a collapse of the organized flow state followed by its re-organisation.",
author = "{Heijst, van}, G.J.F.",
year = "2009",
language = "English",
note = "conference; Mexican Physical Society; 2009-10-26; 2009-10-26 ; Conference date: 26-10-2009 Through 26-10-2009",

}

Heijst, van, GJF 2009, 'Two-dimensional turbulence on a bounded domain : the role of angular momentum', conference; Mexican Physical Society; 2009-10-26; 2009-10-26, 26/10/09 - 26/10/09.

Two-dimensional turbulence on a bounded domain : the role of angular momentum. / Heijst, van, G.J.F.

2009. conference; Mexican Physical Society; 2009-10-26; 2009-10-26, .

Onderzoeksoutput: Bijdrage aan congresOther

TY - CONF

T1 - Two-dimensional turbulence on a bounded domain : the role of angular momentum

AU - Heijst, van, G.J.F.

PY - 2009

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N2 - In contrast to its counterpart in the 3D world, turbulence in 2D is characterized by an inverse energy cascade. The presence of this inverse cascade in 2D turbulence is visible in the so-called self-organization of such flows: larger vortices and structures are observed to emerge from initially random flow fields. The lecture will address the evolution of 2D turbulent flows on a finite domain with no-slip walls. The organized state consists of a large, domain-filling cell whose motion can be considered as inviscid. Results of both laboratory experiments in rotating / stratified fluids and numerical simulations, however, reveal the crucial role played by the unsteady boundary layers: the domain boundaries act as important sources of large-amplitude vorticity filaments that may influence the motion in the interior. Attention will be given to global flow quantities like the kinetic energy, the enstrophy, and the total angular momentum. In the case of forced 2D turbulence, the latter quantity may show a remarkable flip-flopping behaviour, associated with a collapse of the organized flow state followed by its re-organisation.

AB - In contrast to its counterpart in the 3D world, turbulence in 2D is characterized by an inverse energy cascade. The presence of this inverse cascade in 2D turbulence is visible in the so-called self-organization of such flows: larger vortices and structures are observed to emerge from initially random flow fields. The lecture will address the evolution of 2D turbulent flows on a finite domain with no-slip walls. The organized state consists of a large, domain-filling cell whose motion can be considered as inviscid. Results of both laboratory experiments in rotating / stratified fluids and numerical simulations, however, reveal the crucial role played by the unsteady boundary layers: the domain boundaries act as important sources of large-amplitude vorticity filaments that may influence the motion in the interior. Attention will be given to global flow quantities like the kinetic energy, the enstrophy, and the total angular momentum. In the case of forced 2D turbulence, the latter quantity may show a remarkable flip-flopping behaviour, associated with a collapse of the organized flow state followed by its re-organisation.

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Heijst, van GJF. Two-dimensional turbulence on a bounded domain : the role of angular momentum. 2009. conference; Mexican Physical Society; 2009-10-26; 2009-10-26, .