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

Research output: Contribution to conferenceOther

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.
Original languageEnglish
Publication statusPublished - 2008
Eventconference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24 -
Duration: 24 Jan 200824 Jan 2008

Conference

Conferenceconference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24
Period24/01/0824/01/08
OtherLecture Linné Flow Centre

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

Cite this

Heijst, van, G. J. F. (2008). Two-dimensional turbulence on a bounded domain : the role of angular momentum. conference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24, .
Heijst, van, G.J.F. / Two-dimensional turbulence on a bounded domain : the role of angular momentum. conference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24, .
@conference{32262fbbbd074d66bd0450d2d022f97d,
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 = "2008",
language = "English",
note = "conference; Lecture Linn{\'e} Flow Centre; 2008-01-24; 2008-01-24 ; Conference date: 24-01-2008 Through 24-01-2008",

}

Heijst, van, GJF 2008, 'Two-dimensional turbulence on a bounded domain : the role of angular momentum' conference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24, 24/01/08 - 24/01/08, .

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

2008. conference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24, .

Research output: Contribution to conferenceOther

TY - CONF

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

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

PY - 2008

Y1 - 2008

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.

M3 - Other

ER -

Heijst, van GJF. Two-dimensional turbulence on a bounded domain : the role of angular momentum. 2008. conference; Lecture Linné Flow Centre; 2008-01-24; 2008-01-24, .