Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Stable stratification"”.
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Shear flow instabilities in stratified magnetohydrodynamics
… instabilities. In this thesis we investigate how stable stratification and magnetic fields affect instabilities of a Kolmogorov shear flow in different parameter regimes of the Boussinesq magnetohydrodynamic (MHD) framework, extending the two-dimensional (2D) model from Balmforth (2002) to include …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… sediment, temperature, and salinity induced stratification on the vertical turbulent diffusion of mass and momentum couples the resulting unsteady conservation equations for fluid momentum, fluid mass, and suspended sediment mass. The wave velocity, current velocity, and suspended sediment …
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Effect of self-stratification on channel flows and boundary layers: a study using direct numerical simulations
… cohesive or non-cohesive is to evolve into a stable stratification, thereby suppressing turbulence in the flow. New insights into inherent mechanism of suppression of turbulence due to self-stratification was aided by Direct Numerical Simulation (DNS) simulations for a simplified formalism of …
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Instability and mixing in a turbulent stratified Taylor-Couette Flow
… independently, in the presence of vertical stable stratification. Oglethorpe (2014) found that, for an initially linearly stratified Taylor-Couette (STC) flow with fixed outer cylinder, the flow spontaneously forms well-mixed layers of constant height separated by sharp density gradient …
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Carbon fluxes of an extensive meadow and attempts for flux partitioning
… fluxes on drought and normal plots in a stable isotope pulse labeling experiment. An increase of carbon allocation by 6.2% to below ground pools as soil and roots and a reduction of shoot respiration by 8.5% due to spring drought were found. Gaining absolute values of carbon allocation, …
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Effect of self-stratification of sediment suspensions in turbulent plane Couette flow
… lutocline formation and breakup by studying the stable stratification in steady, equilibrium sediment-laden plane turbulent Couette flow is presented in the dissertation. Analysis has been made based on a mixing length hypothesis, and numerical simulations have been conducted with an algebraic …
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Dynamics of Atmospheric Gravity Wave Breaking in the Mesopause Region
… becoming convectively or dynamically unstable in the mesopause region and how is it affected by GWs? How turbulence develops as a result of instabilities, and what are the roles of GWs and background in this process? What is the effect of turbulence on heat transport and how is it …
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Instability and Energy Growth in Stratified Shear Flows
… as possible candidates. The introduction of stratification can affect the strength of the instabilities and transient growth by suppressing vertical motions, but it can also introduce new instabilities as a consequence of the supported gravity waves. This thesis explores aspects of modal …
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Reactive Trace Gases within and above a Grassland Canopy: Challenges for Flux and Transport Process Determination
… canopy this interestingly implied a daytime stable stratification and a nighttime unstable stratification. The diurnal courses of in-canopy transport characteristics reflected the stratification. The grassland showed parallels with Amazonian rainforest canopies from the literature. …