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Scaling And Parameterization Of Stratified Homogeneous Turbulent Shear Flow, Lucinda H. Shih, Jeffrey R. Koseff, Joel H. Ferziger, Chris R. Rehmann
Scaling And Parameterization Of Stratified Homogeneous Turbulent Shear Flow, Lucinda H. Shih, Jeffrey R. Koseff, Joel H. Ferziger, Chris R. Rehmann
Chris R. Rehmann
Homogeneous sheared stratified turbulence was simulated using a DNS code. The initial turbulent Reynolds numbers (Re) were 22, 44, and 89, and the initial dimensionless shear rate (S*) varied from 2 to 16. We found (similarly to Rogers (1986) for unstratified flows) the final value of S* at high Re to be [similar] 11, independent of initial S*. The final S* varies at low Re, in agreement with Jacobitz et al. (1997). At low Re, the stationary Richardson number (Ris) depends on both Re and S*, but at higher Re, it varies only with Re. A scaling based on the …
Diapycnal Diffusivity Inferred From Scalar Microstructure Measurements Near The New England Shelf/Slope Front, Chris R. Rehmann, Timothy F. Duda
Diapycnal Diffusivity Inferred From Scalar Microstructure Measurements Near The New England Shelf/Slope Front, Chris R. Rehmann, Timothy F. Duda
Chris R. Rehmann
Conductivity microstructure was used to estimate the diapycnal thermal eddy diffusivity KT near the New England shelf/slope front in early August 1997. Two datasets were collected with a towed vehicle. One involved several horizontal tows in and above a warm, salty layer near the seafloor, and the other was from a tow-yo transect that sampled most of the water column. In the bottom layer, KT derived from microstructure is a factor of about 5 smaller than estimates derived from tracer dispersion at the same density level, and the diffusivity decreases sharply as the buoyancy frequency N increases: KT N−3.1. With …