An experimental study of unsteady separation in a two-dimensional flow
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/33747 |
| _version_ | 1811078083695869952 |
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| author | Coral Pinto, Raul Javier |
| author2 | Tomas Peacock and George Haller. |
| author_facet | Tomas Peacock and George Haller. Coral Pinto, Raul Javier |
| author_sort | Coral Pinto, Raul Javier |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005. |
| first_indexed | 2024-09-23T10:53:07Z |
| format | Thesis |
| id | mit-1721.1/33747 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:53:07Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/337472019-04-10T10:39:36Z An experimental study of unsteady separation in a two-dimensional flow Coral Pinto, Raul Javier Tomas Peacock and George Haller. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005. Includes bibliographical references (leaves 102-104). An experimental study of flow separation in an incompressible two-dimensional unsteady flow was undertaken with the aim of validating recently developed flow separation criteria, which are based on kinematic principles. Specifically, the so-called rotor-oscillator arrangement was utilized to perform a series of experiments in steady, unsteady periodic, and aperiodic two- dimensional viscous flows at low Reynolds number. Flow separation under these conditions was investigated by means of flow visualization, shear stress sensors, and numerical simulation. The existence of fixed and moving separation structures, as predicted by the recent criteria, was verified in the experiments. Fixed separation structures were encountered in periodic flows and random flows, while moving separation was observed in a slow periodic flow and a random flow with linear drift. It was determined that separation in the rotor-oscillator experiment is strongly correlated to two factors: flow unsteadiness and flow ejection from the wall. The balance of the characteristic length and time scales of unsteadiness and ejection determines whether the separating structure is moving or is fixed. (cont.) The experimental and numerical results strengthen the notion that the instantaneous zero skin friction point alone does not denote flow separation in unsteady flow. Rather, flow separation in unsteady flow can be better understood from a Lagrangian perspective, in which case it can be treated in a robust and coherent manner. by Raul Javier Coral Pinto. S.M. 2006-07-31T15:30:07Z 2006-07-31T15:30:07Z 2005 2005 Thesis http://hdl.handle.net/1721.1/33747 65192739 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 104 leaves 6427232 bytes 6431552 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Coral Pinto, Raul Javier An experimental study of unsteady separation in a two-dimensional flow |
| title | An experimental study of unsteady separation in a two-dimensional flow |
| title_full | An experimental study of unsteady separation in a two-dimensional flow |
| title_fullStr | An experimental study of unsteady separation in a two-dimensional flow |
| title_full_unstemmed | An experimental study of unsteady separation in a two-dimensional flow |
| title_short | An experimental study of unsteady separation in a two-dimensional flow |
| title_sort | experimental study of unsteady separation in a two dimensional flow |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/33747 |
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