Turbulence and Thermal Structure in the Upper Ocean: Turbulence-Resolving Simulations
| Autor: | Hieu T. Pham, Sutanu Sarkar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Entrainment (hydrodynamics)
Turbulence General Chemical Engineering Subsurface currents Direct numerical simulation General Physics and Astronomy 02 engineering and technology Mechanics 01 natural sciences Physics::Geophysics 010305 fluids & plasmas Physics::Fluid Dynamics 020303 mechanical engineering & transports 0203 mechanical engineering Heat flux 0103 physical sciences Heat transfer Physical and Theoretical Chemistry Shear flow Physics::Atmospheric and Oceanic Physics Geology Large eddy simulation |
| Zdroj: | Flow, Turbulence and Combustion. 103:985-1009 |
| ISSN: | 1573-1987 1386-6184 |
| DOI: | 10.1007/s10494-019-00065-5 |
| Popis: | The upper layer of the ocean participates directly in the exchange of momentum, heat and moisture with the atmosphere. We consider three examples of upper-ocean flow and heat transfer in the present contribution. These examples range from the canonical problem of a stratified shear layer to the surface boundary layer driven by wind and a diurnally varying heat flux to deep cycle turbulence in the Equatorial UnderCurrents (EUC). These problems illustrate stratified shear flow turbulence, wind-driven entrainment in a stratified, rotating fluid, and the communication of surface forcing to subsurface currents in the upper ocean. We discuss the three cases by including new simulations as well as some of our previous work. Direct numerical simulation (DNS) is our tool for the canonical shear layer and, for the other problems, our tool is large eddy simulation (LES) which is increasingly being used to examine turbulent transport and mixing in the ocean. We discuss how buoyancy and rotation affects the spatial structure and temporal evolution of turbulent fluxes, and thereby the distribution of surface inputs of momentum and heat in the upper ocean. |
| Databáze: | OpenAIRE |
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