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 proceedingConference contributionAcademic

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 languageEnglish
Title of host publicationProceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008
Publication statusPublished - 2008
Event61st 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 200825 Nov 2008
http://www.aps.org/meetings/meeting.cfm?name=DFD08

Conference

Conference61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA
Abbreviated titleDFD08
CountryUnited States
CitySan Antonio, TX
Period23/11/0825/11/08
Internet address

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