Boundaries influence on the flow fields around an oscillating sphere
This work analyzes the effects of the interaction between an oscillating sphere and free surface flows through the reconstruction of the flow field around the body and the analysis of the displacements. The experiments were performed in an open water channel, where the sphere had three different bou...
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Online Access: | http://hdl.handle.net/11311/748376 https://doi.org/10.1115/OMAE2013-11385 |
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ftpolimilanoiris:oai:re.public.polimi.it:11311/748376 2024-04-14T08:05:02+00:00 Boundaries influence on the flow fields around an oscillating sphere MIRAUDA, DOMENICA MALAVASI, STEFANO Volpe Plantamura A. Mirauda, Domenica Volpe Plantamura, A. Malavasi, Stefano 2013 http://hdl.handle.net/11311/748376 https://doi.org/10.1115/OMAE2013-11385 eng eng info:eu-repo/semantics/altIdentifier/isbn/9780791855416 info:eu-repo/semantics/altIdentifier/wos/WOS:000360868500074 ispartofbook:Proceedings of the 32nd International Conference on Ocean, Offshore, and Arctic Engineering OMAE2013 International Conference on Ocean, Offshore, and Arctic Engineering OMAE2013 firstpage:1 lastpage:10 numberofpages:10 http://hdl.handle.net/11311/748376 doi:10.1115/OMAE2013-11385 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84893147189 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/conferenceObject 2013 ftpolimilanoiris https://doi.org/10.1115/OMAE2013-11385 2024-03-18T16:04:35Z This work analyzes the effects of the interaction between an oscillating sphere and free surface flows through the reconstruction of the flow field around the body and the analysis of the displacements. The experiments were performed in an open water channel, where the sphere had three different boundary conditions in respect to the flow, defined as h* (the ratio between the distance of the sphere upper surface from the free surface and the sphere diameter). A quasi-symmetric condition at h*=2, with the sphere equally distant from the free surface and the channel bottom, and two conditions of asymmetric bounded flow, one with the sphere located at a distance of 0.003m from the bottom at h*=3.97 and the other with the sphere close to the free surface at h*=0, were considered. The sphere was free to move in two directions, streamwise (x) and transverse to the flow (y), and was characterized by values of mass ratio, m*=1.34 (ratio between the system mass and the displaced fluid mass), and damping ratio, ??=0.004. The comparison between the results of the analyzed boundary conditions has shown the strong influence of the free surface on the evolution of the vortex structures downstream the obstacle. Conference Object Arctic RE.PUBLIC@POLIMI - Research Publications at Politecnico di Milano Volume 7: CFD and VIV |
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Open Polar |
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RE.PUBLIC@POLIMI - Research Publications at Politecnico di Milano |
op_collection_id |
ftpolimilanoiris |
language |
English |
description |
This work analyzes the effects of the interaction between an oscillating sphere and free surface flows through the reconstruction of the flow field around the body and the analysis of the displacements. The experiments were performed in an open water channel, where the sphere had three different boundary conditions in respect to the flow, defined as h* (the ratio between the distance of the sphere upper surface from the free surface and the sphere diameter). A quasi-symmetric condition at h*=2, with the sphere equally distant from the free surface and the channel bottom, and two conditions of asymmetric bounded flow, one with the sphere located at a distance of 0.003m from the bottom at h*=3.97 and the other with the sphere close to the free surface at h*=0, were considered. The sphere was free to move in two directions, streamwise (x) and transverse to the flow (y), and was characterized by values of mass ratio, m*=1.34 (ratio between the system mass and the displaced fluid mass), and damping ratio, ??=0.004. The comparison between the results of the analyzed boundary conditions has shown the strong influence of the free surface on the evolution of the vortex structures downstream the obstacle. |
author2 |
Mirauda, Domenica Volpe Plantamura, A. Malavasi, Stefano |
format |
Conference Object |
author |
MIRAUDA, DOMENICA MALAVASI, STEFANO Volpe Plantamura A. |
spellingShingle |
MIRAUDA, DOMENICA MALAVASI, STEFANO Volpe Plantamura A. Boundaries influence on the flow fields around an oscillating sphere |
author_facet |
MIRAUDA, DOMENICA MALAVASI, STEFANO Volpe Plantamura A. |
author_sort |
MIRAUDA, DOMENICA |
title |
Boundaries influence on the flow fields around an oscillating sphere |
title_short |
Boundaries influence on the flow fields around an oscillating sphere |
title_full |
Boundaries influence on the flow fields around an oscillating sphere |
title_fullStr |
Boundaries influence on the flow fields around an oscillating sphere |
title_full_unstemmed |
Boundaries influence on the flow fields around an oscillating sphere |
title_sort |
boundaries influence on the flow fields around an oscillating sphere |
publishDate |
2013 |
url |
http://hdl.handle.net/11311/748376 https://doi.org/10.1115/OMAE2013-11385 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/9780791855416 info:eu-repo/semantics/altIdentifier/wos/WOS:000360868500074 ispartofbook:Proceedings of the 32nd International Conference on Ocean, Offshore, and Arctic Engineering OMAE2013 International Conference on Ocean, Offshore, and Arctic Engineering OMAE2013 firstpage:1 lastpage:10 numberofpages:10 http://hdl.handle.net/11311/748376 doi:10.1115/OMAE2013-11385 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84893147189 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1115/OMAE2013-11385 |
container_title |
Volume 7: CFD and VIV |
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1796301914447544320 |