Very large eddy simulation of the Red Sea overflow

Mehmet Ilicak*, Tamay M. Özgökmen, Hartmut Peters, Helmut Z. Baumert, Mohamed Iskandarani

*Bu çalışma için yazışmadan sorumlu yazar

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19 Atıf (Scopus)

Özet

Mixing between overflows and ambient water masses is a critical problem of deep-water mass formation in the downwelling branch of the meridional overturning circulation of the ocean. Modeling approaches that have been tested so far rely either on algebraic parameterizations in hydrostatic ocean circulation models, or on large eddy simulations that resolve most of the mixing using nonhydrostatic models. In this study, we examine the performance of a set of turbulence closures, that have not been tested in comparison to observational data for overflows before. We employ the so-called very large eddy simulation (VLES) technique, which allows the use of k s(-) ε models in nonhydrostatic models. This is done by applying a dynamic spatial filtering to the k s(-) ε equations. To our knowledge, this is the first time that the VLES approach is adopted for an ocean modeling problem. The performance of k s(-) ε and VLES models are evaluated by conducting numerical simulations of the Red Sea overflow and comparing them to observations from the Red Sea Outflow Experiment (REDSOX). The computations are constrained to one of the main channels transporting the overflow, which is narrow enough to permit the use of a two-dimensional (and nonhydrostatic) model. A large set of experiments are conducted using different closure models, Reynolds numbers and spatial resolutions. It is found that, when no turbulence closure is used, the basic structure of the overflow, consisting of a well-mixed bottom layer (BL) and entraining interfacial layer (IL), cannot be reproduced. The k s(-) ε model leads to unrealistic thicknesses for both BL and IL, while VLES results in the most realistic reproduction of the REDSOX observations.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)183-206
Sayfa sayısı24
DergiOcean Modelling
Hacim20
Basın numarası2
DOI'lar
Yayın durumuYayınlandı - 2008
Harici olarak yayınlandıEvet

Finansman

We are grateful for the support of National Science Foundation via grants OCE 0352047 and OCE 0620661. We thank Yeon Chang for providing the bottom topography, and Marcello G. Magaldi for his constructive criticism.

FinansörlerFinansör numarası
National Science FoundationOCE 0352047, OCE 0620661

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