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 11 of 11 for “"Three-dimensional turbulence"”.
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Three-dimensional turbulence mechanisms in a supersonic separated/reattaching longitudinal cylinder wake
… work provides a detailed characterization of the turbulence structure in the near-wake of a blunt-based cylinder aligned at zero angle-of-attack in a Mach 2.49 freestream. Particular emphasis is placed in this work on the identification of turbulence mechanisms in the flow regions both upstream …
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Investigation of mean flow and vertical vorticity in turbulent convection using spectral simulations on massively parallel processors
… here range from steady horizontally-oriented two-dimensional rolls to unsteady three-dimensional turbulence.
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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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Eddies and friction : removal of vorticity from the wind-driven gyre
… physics like topographic interaction and three dimensional turbulence over the shelf. This boundary-enhanced viscosity allows western-intensified mean flows even when the inertial boundary width is much wider than the frictional region because eddies flux vorticity from within the interior …
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Eddies and friction : removal of vorticity from the wind-driven gyre
… physics like topographic interaction and three dimensional turbulence over the shelf. This boundary-enhanced viscosity allows western-intensified mean flows even when the inertial boundary width, is much wider than the frictional region because eddies flux vorticity from within the …
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Advanced Spectral Methods for Turbulent Flows
… simulation (DNS) of isotropic homogeneous turbulence in spectral space. In the adaptive spectral resolution (ASR) technique developed here the spectral resolution in spectral space is dynamically refined based on refinement criteria suited to the special features of isotropic homogeneous …
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Cross-shore transformation of breaking random waves in the surfzone
… on the surface of a breaking wave, and the turbulence, determines the wave-driven onshore-directed mass transport, the vertical structure of the compensating return flow (undertow), and the increase in the mean water level (setup). A two-phase Reynolds-Averaged Navier-Stokes (RANS) model and …
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Cross-shore Transformation of Breaking Random Waves in the Surfzone
… on the surface of a breaking wave, and the turbulence, determines the wave-driven onshore-directed mass transport, the vertical structure of the compensating return flow (undertow), and the increase in the mean water level (setup). A two-phase Reynolds-Averaged Navier-Stokes (RANS) model and …
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Necessary and Sufficient Conditions for the Transfer of Kinetic Energy at Asymptotically Large Reynolds Numbers
… decreases toward 0. One striking feature of three-dimensional turbulence is the presence of anomalous dissipation, or that the mean rate of energy dissipation is bounded below by a positive number in the inviscid limit. This is thought to be due to the convective acceleration acting in part …
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Adjoint-based control of turbulent jet noise
… a fact largely attributed to the complexity of turbulence as a source of sound and to the subtlety of the sound-production mechanism. Both aeroacoustic theory and high-fidelity simulation have demonstrated that turbulence-generated noise can be predicted with sufficient accuracy; however, they …
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Modelling turbulence and transport of buoyant material in the ocean surface mixed layer
… differences drive the generation of small-scale, three-dimensional turbulence and mixing of oceanic waters. These turbulent flows govern the distribution of buoyant materials including oil droplets and microplastics, which have significant implications for marine life and safety. However, …