Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom
Thesis (Ph.D.)--Memorial University of Newfoundland, 2004. Mathematics and Statistics Includes bibliographical references (leaves 255-262) The present thesis deals with analysis and numerical simulation of a new class of wake flows created by combined recti-linear (translational) and rotational osci...
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ftmemorialunivdc:oai:collections.mun.ca:theses4/40245 2023-05-15T17:23:34+02:00 Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom Al-Mdallal, Qasem M. 1973- Memorial University of Newfoundland. Dept of Mathematics and Statistics 2004 xxvi, 262 leaves : col. ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses4/id/40245 Eng eng Electronic Theses and Dissertations (32.18 MB) -- http://collections.mun.ca/PDFs/theses/Al-Mdallal_QasemM.pdf a2972741 http://collections.mun.ca/cdm/ref/collection/theses4/id/40245 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Cross-flow (Aerodynamics)--Mathematical models Cylinders--Fluid dynamics Oscillations--Mathematical models Rotating masses of fluid--Mathematical models Text Electronic thesis or dissertation 2004 ftmemorialunivdc 2015-08-06T19:21:57Z Thesis (Ph.D.)--Memorial University of Newfoundland, 2004. Mathematics and Statistics Includes bibliographical references (leaves 255-262) The present thesis deals with analysis and numerical simulation of a new class of wake flows created by combined recti-linear (translational) and rotational oscillation of a cylinder placed in a steady uniform flow. The flow is incompressible and two-dimensional, and recti-linear and rotational oscillations are harmonic. The instantaneous translation and rotation start at the same moment and the development of the flow is studied in a coordinate frame which moves with the cylinder but does not rotate. The analysis is carried out for combined phase-locked translation and rotation with a single frequency. The results are presented for five set of the four dimensionless groups which characterize this flow. The resulting vortex formation modes and synchronization (lock-on) phenomena behind the cylinder (in the near-wake region) as well as the fluid forces acting on the cylinder are analyzed. In addition, a series of one-degree-of-freedom (1-DoF) forced vibration calculations are carried out to better understand what differences result from the addition of rotational oscillations to streamwise (in-line) or cross-stream (transverse) motion and to see which effects a transverse-only or in-line-only simulations miss. The numerical scheme is verified by applying it to the special cases of uniform flow past a stationary cylinder; a steadily rotating cylinder; a cylinder undergoing (1-DoF) forced (recti-linear or rotational) oscillations. Exceptionally good comparisons with previous experimental and numerical results are obtained. Furthermore, the simulations of the start-up flow for the case of combined (2-DoF) forced recti-linear and rotational cylinder oscillations at a moderate Reynolds number are consistent with the results of the analytical solution. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Cross-flow (Aerodynamics)--Mathematical models Cylinders--Fluid dynamics Oscillations--Mathematical models Rotating masses of fluid--Mathematical models |
spellingShingle |
Cross-flow (Aerodynamics)--Mathematical models Cylinders--Fluid dynamics Oscillations--Mathematical models Rotating masses of fluid--Mathematical models Al-Mdallal, Qasem M. 1973- Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
topic_facet |
Cross-flow (Aerodynamics)--Mathematical models Cylinders--Fluid dynamics Oscillations--Mathematical models Rotating masses of fluid--Mathematical models |
description |
Thesis (Ph.D.)--Memorial University of Newfoundland, 2004. Mathematics and Statistics Includes bibliographical references (leaves 255-262) The present thesis deals with analysis and numerical simulation of a new class of wake flows created by combined recti-linear (translational) and rotational oscillation of a cylinder placed in a steady uniform flow. The flow is incompressible and two-dimensional, and recti-linear and rotational oscillations are harmonic. The instantaneous translation and rotation start at the same moment and the development of the flow is studied in a coordinate frame which moves with the cylinder but does not rotate. The analysis is carried out for combined phase-locked translation and rotation with a single frequency. The results are presented for five set of the four dimensionless groups which characterize this flow. The resulting vortex formation modes and synchronization (lock-on) phenomena behind the cylinder (in the near-wake region) as well as the fluid forces acting on the cylinder are analyzed. In addition, a series of one-degree-of-freedom (1-DoF) forced vibration calculations are carried out to better understand what differences result from the addition of rotational oscillations to streamwise (in-line) or cross-stream (transverse) motion and to see which effects a transverse-only or in-line-only simulations miss. The numerical scheme is verified by applying it to the special cases of uniform flow past a stationary cylinder; a steadily rotating cylinder; a cylinder undergoing (1-DoF) forced (recti-linear or rotational) oscillations. Exceptionally good comparisons with previous experimental and numerical results are obtained. Furthermore, the simulations of the start-up flow for the case of combined (2-DoF) forced recti-linear and rotational cylinder oscillations at a moderate Reynolds number are consistent with the results of the analytical solution. |
author2 |
Memorial University of Newfoundland. Dept of Mathematics and Statistics |
format |
Thesis |
author |
Al-Mdallal, Qasem M. 1973- |
author_facet |
Al-Mdallal, Qasem M. 1973- |
author_sort |
Al-Mdallal, Qasem M. 1973- |
title |
Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
title_short |
Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
title_full |
Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
title_fullStr |
Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
title_full_unstemmed |
Analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
title_sort |
analysis and computation of the cross-flow past an oscillatiang cylinder with two degrees of freedom |
publishDate |
2004 |
url |
http://collections.mun.ca/cdm/ref/collection/theses4/id/40245 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (32.18 MB) -- http://collections.mun.ca/PDFs/theses/Al-Mdallal_QasemM.pdf a2972741 http://collections.mun.ca/cdm/ref/collection/theses4/id/40245 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
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1766113429863530496 |