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double-gyre
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Interaction of Large-scale Oceanic Currents and the Earth’s Wobble
, Ph.D. Dissertation Sharif University of Technology ; Jalali, Abbas (Supervisor) ; Behzad, Mehdi (Co-Advisor)
Abstract
In this thesis, we investigate interactions of a double-gyre in the North Atlantic and the earth’s Chandler wobble using a single-layer ocean model based on depth-averaged Navier-Stokes equations and multiple-scale spectral solutions to it. The overall transfers of energy and angular momentum from the double-gyre to the Chandler wobble are used to calibrate the turbulence parameters of the idealized ocean model and Smagorinsky eddy viscosity is used to estimate turbulent diffusion terms. Our model is tested against a multilayer quasi-geostrophic ocean model in turbulent regime, and base states used in parameter identification are obtained from mesoscale eddy resolving numerical simulations....
Fast spectral solutions of the double-gyre problem in a turbulent flow regime
, Article Applied Mathematical Modelling ; Volume 66 , 2019 , Pages 745-767 ; 0307904X (ISSN) ; Karabasov, S. A ; Jalali, M. A ; Sadati, S. M. H ; Sharif University of Technology
Elsevier Inc
2019
Abstract
Several semi-analytical models are considered for a double-gyre problem in a turbulent flow regime for which a reference fully numerical eddy-resolving solution is obtained. The semi-analytical models correspond to solving the depth-averaged Navier–Stokes equations using the spectral Galerkin approach. The robustness of the linear and Smagorinsky eddy-viscosity models for turbulent diffusion approximation is investigated. To capture essential properties of the double-gyre configuration, such as the integral kinetic energy, the integral angular momentum, and the jet mean-flow distribution, an improved semi-analytical model is suggested that is inspired by the idea of scale decomposition...