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Filtering by: Academic Affiliation College of Oceanic and Atmospheric Sciences Creator Kimura, Satoshi

Instability and Diapycnal Momentum Transport in a Double-Diffusive, Stratified Shear Layer

Creator:

Smyth, William D. and Kimura, Satoshi

Abstract:

The linear stability of a double-diffusively stratified, inflectional shear flow is investigated. Double-diffusive stratification has little effect on shear instability except when the density ratio R[subscript]ρ is close to unity. Double-diffusive instabilities have significant growth rates and can represent the fastest-growing mode even in the presence of inflectionally unstable shear...

Resource Type:

Article
Turbulence in a Sheared, Salt-Fingering-Favorable Environment: Anisotropy and Effective Diffusivities

Creator:

Kimura, Satoshi, Smyth, William, and Kunze, Eric

Abstract:

Direct numerical simulations (DNS) of a shear layer with salt-fingering-favorable stratification have been performed for different Richardson numbers Ri and density ratios R[subscript]p. In the absence of shear (Ri = oo), the primary instability is square planform salt fingering, alternating cells of rising and sinking fluid. In the presence of...

Resource Type:

Article
Turbulence in sheared, salt-fingering favorable environment

Creator:

Kimura, Satoshi

Abstract:

Instability and turbulence in sheared, salt-fingering favorable stratification are studied using three-dimensional direct numerical simulations (DNS). Salt-fingering favorable stratification is gravitationally stable, because the unstable vertical gradient of salinity is stabilized by temperature (warm, salty over cool, fresh water-masses). Salt-fingering instability can occur at the interface of these different water-masses....

Resource Type:

Dissertation