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 9 of 9 for “"Two-dimensional turbulence"”.
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Exact coherent structures and non-universality in the direct cascade in two-dimensional turbulence
Turbulence is the most important problem in physics and applied mathematics, with applications ranging from astrophysics, to engineering, to plumbing, and more. Turbulent flows are often characterized by the presence of various cascades, which transport various quantities across length scales. This …
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Rossby waves and two-dimensional turbulence in the presence of a large-scale zonal jet
… and observational study of barotropic 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 …
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The Statistical Theory of Stationary Turbulence
This thesis concerns the theory of turbulence as well as that of wavelet transforms. The main contribution to the theory of turbulence is an extension of the von Karman-Howarth equation to turbulence that may be either two- or three-dimensional, and for which external forcing maintains the state of …
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Lagrangian acceleration measurements via PTVA (Particle Tracking Velocimetry and Accelerometry) on a turbulent-like flow
Quasi-two-dimensional turbulence (Q2D) has both a practical and theoretical relevance. Following the topological approach, turbulent-like flows have the aim to model and study some of the aspects of turbulence. With this target, in the laboratory of the Imperial College London, Q2D …
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Multiscale Modeling and Simulation of Turbulent Geophysical Flows
… ocean circulation models, decaying and forced two-dimensional turbulence simulations, as well as several benchmark incompressible flow problems in two and three dimensions. The new models proposed here are based on two classes of modern multiscale methods: (i) interpolation based approaches in …
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Structure and Turbulence of the Three-Dimensional Boundary Layer Flow over a Hill
Three-dimensional (3D) turbulent boundary layers (TBLs) are ubiquitous in most engineering applications, but most turbulence models used to simulate these flows are built on two-dimensional turbulence theory, limiting the accuracy of simulation results. To improve the accuracy of turbulence …
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An experimental study of the spread of buoyant water into a rotating environment
… that finite potential vorticity and background turbulence play in determining the flow properties. When water of an anomalous density enters into an oceanic basin, gravity-driven surface flows can be established as a result of the density difference. These flows are often of a sufficiently large …
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Quasigeostrophic flows and turbulence in a rotating homogeneous fluid
… a laboratory study of quasigeostrophic flow and turbulence in a rotating homogeneous fluid has been undertaken. Two dimensional turbulence driven by a uniform distribution of sources and sinks which oscillate in time, can be fairly well reproduced in this context. Inertial time scales are about …
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Experiments in turbulent soap-film flows: Marangoni shocks, frictional drag, and energy spectra
… over smooth walls. These flows are effectively two-dimensional, and we are able to create soap-film flows with the two types of turbulent spectrum that are theoretically possible in two dimensions: the ``enstrophy cascade,'' for which the spectral exponent $\alpha=3$, and the ``inverse energy …