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On the transition from two- to three-dimensional turbulence in the presence of background rotation
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Brons, Jonathan A. (2019) On the transition from two- to three-dimensional turbulence in the presence of background rotation. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3714524
Abstract
We explore the transition from three-dimensional to two-dimensional turbulence in rotating turbulent flows. Inertial waves are thought of as the main mechanism driving physical processes in rotating turbulent flows. However, they can only exist in a limited flow regime and some steady anisotropic phenomena, such as Taylor columns, are driven by wave-free mechanisms. We identify these flow regimes and conditions under which inertial waves play no part with regards to formation of columnar structures, the promotion of anisotropy and the development of a transient turbulent flow field. A new mechanism is proposed by which columnar structures and anisotropy in general develop in rotating flows, which is based on a balance between the Coriolis force and the viscous or inertial forces operating in the flow field. These theories are validated experimentally using a setup where turbulence is forced through fluid injection/withdrawal and both 3D and quasi-2D flow structures develop. In line with the proposed mechanism, the columnar structures are found to scale as _ Ro
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QA Mathematics Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Library of Congress Subject Headings (LCSH): | Turbulence, Rotational motion, Anisotropy, Rotating masses of fluid | ||||
| Official Date: | 21 October 2019 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | School of Engineering | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Thomas, Peter J. ; Pothérat, Alban | ||||
| Format of File: | |||||
| Extent: | various pagings : illustrations | ||||
| Language: | eng |
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