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 13 of 13 for “"Fluid Turbulence"”.
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Spatial-temporal patterns in evolutionary ecology and fluid turbulence
"This thesis explores the turbulence of ecosystems, and the ecology of turbulence. Ecosystems and turbulent fluids are both highly non-equilibrium and exhibit spatio-temporal complexity during the course of their evolution. It might seem that they are too complicated to extract universal …
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A Stochastic Lagrangian Model for Non-Gaussian Fluid Turbulence and Its Application to Describe Particle Dispersion in a Channel
Stochastic Lagrangian simulations are computationally efficient, since the equations to be solved are not partial differential equations as in the direct simulations. They are ideally suited for parallel computers. The stochastic model is about 120 times faster than the DNS on a single processor on …
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An experimental study of the effect of small particles on the fluid turbulence in fully developed flow of air in a horizontal pipe
… the most energetic turbulent disturbances in the fluid.
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Physical modelling of colloidal slurry flows
… within the aggregate, enhancing the level of fluid turbulence. The centre-line and near wall turbulence intensities are enhanced in the presence of aggregates, while dispersed suspensions have negligible effect on modulating the fluid turbulence. Measurement of the streamwise RMS shows two …
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Exact coherent structures in spatiotemporal chaos: From qualitative description to quantitative predictions
… of such phenomena range from cardiac dynamics to fluid turbulence, where the motion is described by nonlinear partial differential equations. It is well known from the studies of low dimensional chaotic systems that the state space, the space of solutions to the governing dynamical equations, is …
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A laboratory study of localized boundary mixing in a rotating stratified fluid
… regions of rough topography. How locally mixed fluid interacts with the ambient fluid is an open question. Laboratory experiments explore the interaction of mechanically induced boundary mixing and an interior body of linearly stratified rotating fluid. Turbulence is generated by a vertically …
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Trait-based approaches to marine microbial ecology
… In Chapter 4, I investigated how small-scale fluid turbulence affects phytoplankton nutrient uptake rates and community structure in an idealized resource competition model. The flux of nutrients to the cell and nutrient uptake are enhanced by turbulence, particularly for big cells in …
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Describing and forecasting patient census: Comparing linear and nonlinear analysis results
… to study a wide range of phenomena, including fluid turbulence, predator/prey systems, epidemics, and language (Gleick, 1987). This study applied statistical methods derived from chaos theory to analyzing and forecasting patient census in a hospital. Patient census data from 1991 through 1994 …
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Pattern Formation in Active Nematics
… in spatio-temporal chaotic dynamics akin to fluid turbulence, but that occurs in a regime of flow of vanishing Reynolds number, where inertia is negligible. Quantifying the origin of this nonequilibrium dynamics has implications for understanding phenomena ranging from bacterial swarming to …
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Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany)
… is eroded and transported in suspension by fluid turbulence into downstream lakes. In the water body the transport capacity of the inflowing turbidity current successively diminishes leading to the deposition of detrital layers on the lake floor. Intercalated into annual laminations these …
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A Bayesian Approach to Estimating Background Flows from a Passive Scalar
… error to develop probabilistic estimates of the fluid flow. In doing so, we leverage frameworks developed in recent years for infinite-dimensional Bayesian inference. We provide conditions under which the inference is consistent, i.e., the posterior measure converges to a Dirac measure on the …
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Modelling of the liquid slag behaviour in the continuous casting mould
This work presents a fluid dynamics model of a continuous caster mould region, including the transient behaviour of the steel/slag interface. The research was carried out in collaboration with ArcelorMittal Research (AMR), based in Maizieres-les-Metz in France. The industrial objective of the …
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Statistical properties of Radio Halos and the re-acceleration model
… of high energy particles via shocks and turbulence driven by these mergers. Present observations of Radio Halos (and possibly of hard X-rays) can be best interpreted in terms of the reacceleration scenario in which MHD turbulence injected during these cluster mergers re-accelerates high …