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 20 of 34 for “"Background Flow"”.
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Background Flow Influence on Impulsive Jet-Driven Micro Droplet Dispersal
… depends on ambient thermodynamic conditions and flow properties of the jet emitted by the activity. However, the droplet spread in conditions of background flow is not yet comprehensively understood. This study uses the Eulerian-Lagrangian model with k−ω turbulence modelling to simulate spread …
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The role of background flow variations in stratified flows over topography
… feature density variations with depth, the flow of a density-stratified fluid over topography is central to various geophysical and meteorological applications and has been studied extensively. For reasons of convenience and mathematical tractability, the majority of theoretical treatments …
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Laser Doppler anemometry measurements of a confined turbulent water jet with a uniform background flow
… turbulent water jet with several very slow, coflowing external streams was measured with a frequency shifted laser Doppler anemometer. The objective was to approximate a jet submerged in an ambient fluid of infinite domain by using a confined jet in a uniform coflow. The coflow prevents flow …
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CFD study of hydrodynamic signal perception by fish using the lateral line system
… line are orders of magnitude smaller than background current velocities. It is not clear how the fish are able to extract this signal. This thesis uses a series of computational fluid dynamic (CFD) simulations, matched with recent experiments, to quantify the effects of 3D fish body parts …
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CFD study of hydrodynamic signal perception by fish using the lateral line system
… line are orders of magnitude smaller than background current velocities. It is not clear how the fish are able to extract this signal. This thesis uses a series of computational fluid dynamic (CFD) simulations, matched with recent experiments, to quantify the effects of 3D fish body parts …
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A Bayesian Approach to Estimating Background Flows from a Passive Scalar
… the statistical inverse problem of estimating a background flow field (e.g., of air or water) from the partial and noisy observation of a passive scalar (e.g., the concentration of a pollutant). Here the unknown is a vector field that is specified by large or infinite number of degrees of …
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The Role of Upstream Lakes in Determining Downstream Severe Lake -Effect Snowstorms
… and eastward as a consequence of stronger background flow and weaker shoreline convergence in the removed case. An idealized model of two-lake interaction was devised using an alternative set of MM5 preprocesses, allowing the definition of simple boundary conditions subject to a single …
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Effects of shape geometry in viscous streaming
Viscous streaming flows generated by objects of constant curvature (circular cylinders, infinite plates) have been well understood. Yet, characterization and understanding of such flows when multiple body length- scales are involved has not been looked into, in rigorous detail. We propose a …
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Time-Domain Simulation of Sound Propagation in Frequency-Dependent Materials
… (DNS) methods, the new approach treats vortex flow field as a scattering background flow and solves the acoustic field with the LEE solver. The numerical method uses a high-order WENO scheme to accommodate the highly convective background flow at high Mach numbers. The study focuses on the …
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The influence of geothermal sources on deep ocean temperature, salinity, and flow fields
… temperature and salinity fields. In Chapter 1 background material is given on the strength and distribution of geothermal heating. In Chapter 2 evidence for the influence of a hydrothermal system in the rift valley of the Mid-Atlantic Ridge on nearby property fields and a model of the flow …
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The influence of geothermal sources on deep ocean temperature, salinity, and flow fields
… temperature and salinity fields. In Chapter 1 background material is given on the strength and distribution of geothermal heating. In Chapter 2 evidence for the influence of a hydrothermal system in the rift valley of the Mid-Atlantic Ridge on nearby property fields and a model of the flow …
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A model of a Mediterranean salt lens in external shear
… lens with a uniform external shear flow is examined. The study is motivated by the desire to understand the processes that affect Mediterranean Salt Lenses and other mesoscale lenses in the ocean. The first model represents the eddy as a pair of quasigeostrophic 'point potential …
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Artificial Lateral Line Canal System for Underwater Disturbance Sensing
… to create an artificial lateral line canal, flow sensors are needed to detect the flow inside the canal. A microfabricated artificial haircell flow sensor has been developed for this purpose. The sensor utilizes a piezoresistive transduction mechanism. It consists of a silicon cantilever with …
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Planet formation, resonant drag instabilities, and vortices
… are notoriously fragile to modifications of the background flow, and vortex flows differ substantially from disc flows. I use a multiple-timescale analysis in the regime of well-coupled grains to derive the first analytical model for dust-laden vortices in protoplanetary discs. I find that if the …
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Simulations and Control of Artificial Microswimmers in Blood
… remains challenging because of the strong blood flows, the presence of blood cells, biocompatibility, noisy feedback and limited propelling velocities. A promising design of microswimmers, called artificial bacterial flagella (ABFs), are helical micro-robots that are propelled via external …
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Viscous flow past plates
… of high order in space (FDMHS) to simulate flow past a finite plate and a semi-infinite plate. The method solves the incompressible Navier-Stokes equation in the stream function-vorticity formulation. The focus is to study a fundamental problem in fluid dynamics, namely, flow past sharp …
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Infrasound as upper atmospheric monitor
… in a stratified medium with (high Mach number) background flow, based on a modal expansion. The underlying mathematics is by no means new and has been earlier described. This solution goes beyond the effective sound speed approximation, which is typically used in infrasound propagation modeling …
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Uncertainty quantification of engineering systems using the multilevel Monte Carlo method
… structural vibrations and buoyancy driven flows through porous media. In the first example, the impact of random mass density is quantified for structural vibration problems in several dimensions using the multilevel Monte Carlo method. Comparable eigenvalues and energy density …
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Rossby waves and two-dimensional turbulence in the presence of a large-scale zonal jet
… waves and turbulence in an inhomogeneous background flow environment. The theoretical aspects of the work are simplified by restricting attention to the two-dimensional doublyperiodic beta-plane, and in nearly every respect to large-scale zonal flows which are barotropically stable (in a …
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Moored observations of shelfbreak processes at the inflow to and outflow from the Arctic Ocean
… used to elucidate shelf-basin exchange at the inflow to and the outflow from the Arctic Ocean. Pacific Water entering the Arctic Ocean forms the Western Arctic shelfbreak current along the Beaufort Sea slope. Data from the mooring array at 152°W—approximately 150 km east of Pt. Barrow, AK—reveals …
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