Wind-driven turbulent oscillating channel flow under a stable stratification

W. Kramer; H.J.H. Clercx; V. Armenio

Wind-driven turbulent oscillating channel flow under a stable stratification

W. Kramer
, H.J.H. Clercx
, V. Armenio

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

Abstract

An LES investigation of the oscillating channel flow subjected to a constant wind stress revealed strong shear production of the turbulence in the wall and free-surface layers. The flow during most of the phases is well described by a combination of two log-law boundary layers. If the driving oscillating pressure gradient and wind stress are aligned turbulent streaks are observed in the entire domain. For a wind stress at a $45^{\circ}$ angle, the streaks in the free-surface and wall layer are not aligned. This results to more isotropic turbulence in the interior. We aim to investigate the effects if a stable stratification is added to this model problem for estuarine flows. The stratification is caused by a constant heat flux at the free-surface. Previous studies observed a strong stratification in the free-surface layer, which suppresses turbulent fluctuations. This might lead to a partially decoupling of the top and bottom layers. Moreover, internal waves could stir up the dynamics of the flow. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.EV.9

Original language	English
Title of host publication	Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008
Publication status	Published - 2008
Event	61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA - San Antonio Convention Center, San Antonio, TX, United States Duration: 23 Nov 2008 → 25 Nov 2008 http://www.aps.org/meetings/meeting.cfm?name=DFD08

Conference

Conference	61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA
Abbreviated title	DFD08
Country/Territory	United States
City	San Antonio, TX
Period	23/11/08 → 25/11/08
Internet address	http://www.aps.org/meetings/meeting.cfm?name=DFD08

Cite this

@inproceedings{fb37e5aae80240b49c8ebb18ed74d668,

title = "Wind-driven turbulent oscillating channel flow under a stable stratification",

abstract = "An LES investigation of the oscillating channel flow subjected to a constant wind stress revealed strong shear production of the turbulence in the wall and free-surface layers. The flow during most of the phases is well described by a combination of two log-law boundary layers. If the driving oscillating pressure gradient and wind stress are aligned turbulent streaks are observed in the entire domain. For a wind stress at a \$45\textasciicircum{}\{\textbackslash{}circ\}\$ angle, the streaks in the free-surface and wall layer are not aligned. This results to more isotropic turbulence in the interior. We aim to investigate the effects if a stable stratification is added to this model problem for estuarine flows. The stratification is caused by a constant heat flux at the free-surface. Previous studies observed a strong stratification in the free-surface layer, which suppresses turbulent fluctuations. This might lead to a partially decoupling of the top and bottom layers. Moreover, internal waves could stir up the dynamics of the flow. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.EV.9",

author = "W. Kramer and H.J.H. Clercx and V. Armenio",

year = "2008",

language = "English",

booktitle = "Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008",

note = "61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA, DFD08 ; Conference date: 23-11-2008 Through 25-11-2008",

url = "http://www.aps.org/meetings/meeting.cfm?name=DFD08",

}

Kramer, W, Clercx, HJH & Armenio, V 2008, Wind-driven turbulent oscillating channel flow under a stable stratification. in Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008. 61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA, San Antonio, TX, United States, 23/11/08.

TY - GEN

T1 - Wind-driven turbulent oscillating channel flow under a stable stratification

AU - Kramer, W.

AU - Clercx, H.J.H.

AU - Armenio, V.

PY - 2008

Y1 - 2008

N2 - An LES investigation of the oscillating channel flow subjected to a constant wind stress revealed strong shear production of the turbulence in the wall and free-surface layers. The flow during most of the phases is well described by a combination of two log-law boundary layers. If the driving oscillating pressure gradient and wind stress are aligned turbulent streaks are observed in the entire domain. For a wind stress at a $45^{\circ}$ angle, the streaks in the free-surface and wall layer are not aligned. This results to more isotropic turbulence in the interior. We aim to investigate the effects if a stable stratification is added to this model problem for estuarine flows. The stratification is caused by a constant heat flux at the free-surface. Previous studies observed a strong stratification in the free-surface layer, which suppresses turbulent fluctuations. This might lead to a partially decoupling of the top and bottom layers. Moreover, internal waves could stir up the dynamics of the flow. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.EV.9

AB - An LES investigation of the oscillating channel flow subjected to a constant wind stress revealed strong shear production of the turbulence in the wall and free-surface layers. The flow during most of the phases is well described by a combination of two log-law boundary layers. If the driving oscillating pressure gradient and wind stress are aligned turbulent streaks are observed in the entire domain. For a wind stress at a $45^{\circ}$ angle, the streaks in the free-surface and wall layer are not aligned. This results to more isotropic turbulence in the interior. We aim to investigate the effects if a stable stratification is added to this model problem for estuarine flows. The stratification is caused by a constant heat flux at the free-surface. Previous studies observed a strong stratification in the free-surface layer, which suppresses turbulent fluctuations. This might lead to a partially decoupling of the top and bottom layers. Moreover, internal waves could stir up the dynamics of the flow. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.EV.9

M3 - Conference contribution

BT - Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008

T2 - 61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA

Y2 - 23 November 2008 through 25 November 2008

ER -

Wind-driven turbulent oscillating channel flow under a stable stratification

Abstract

Conference

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