Vortex-induced motion of a free-standing riser below the critical mass ratio
The presented work studied the vortex-induced motion (VIM) response of a free-standing riser (FSR) with varied riser length and buoyancy can (BC) mass with an ultimate aim to find a combination that would reduce the motion of the system. Specifically, four model configurations were experimentally te...
Published in: | Volume 2: Prof. Carl Martin Larsen and Dr. Owen Oakley Honoring Symposia on CFD and VIV |
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Edith Cowan University, Research Online, Perth, Western Australia
2014
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Online Access: | https://ro.ecu.edu.au/ecuworkspost2013/3667 https://doi.org/10.1115/OMAE2017-61399 |
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ftedithcowan:oai:ro.ecu.edu.au:ecuworkspost2013-4673 2023-05-15T14:59:54+02:00 Vortex-induced motion of a free-standing riser below the critical mass ratio Florager, Curtis Balash, Cheslav 2014-01-01T08:00:00Z https://ro.ecu.edu.au/ecuworkspost2013/3667 https://doi.org/10.1115/OMAE2017-61399 unknown Edith Cowan University, Research Online, Perth, Western Australia https://ro.ecu.edu.au/ecuworkspost2013/3667 https://doi.org/10.1115/OMAE2017-61399 subscription content Research outputs 2014 to 2021 Arctic engineering Arctic vehicles computational fluid dynamics flow velocity mooring software testing Power and Energy text 2014 ftedithcowan https://doi.org/10.1115/OMAE2017-61399 2022-03-19T23:53:26Z The presented work studied the vortex-induced motion (VIM) response of a free-standing riser (FSR) with varied riser length and buoyancy can (BC) mass with an ultimate aim to find a combination that would reduce the motion of the system. Specifically, four model configurations were experimentally tested in a flume tank over a range of flow velocities, with the BC motion recorded by a submersible camera positioned directly above the model; consequently, inline (IL) and crossflow (CF) amplitudes were estimated with a motion tracking software. In the pre-resonant flow regime, non-dimensionally, minimal differences were observed between the CF amplitudes, and the IL motion was reduced with a longer riser. Given the extreme length of full-scale FSRs and inherent low natural frequency, it is impractical to increase the riser tension to a point where VIM would not occur under normal environmental conditions. Alternatively, increasing the mass ratio of the BC so that it is above the critical mass ratio of 0.54 (the ratio of the mass of the body to the mass of the fluid) would limit the resonant flow velocities to a finite range, but a larger BC may not be an economically viable solution, and because of the increased diameter, it would experience a larger CF amplitude during resonance. Further study into the prevention of VIM of an FSR by varying the riser length and BC mass is unlikely to be beneficial. Text Arctic Edith Cowan University (ECU, Australia): Research Online Arctic Volume 2: Prof. Carl Martin Larsen and Dr. Owen Oakley Honoring Symposia on CFD and VIV |
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Open Polar |
collection |
Edith Cowan University (ECU, Australia): Research Online |
op_collection_id |
ftedithcowan |
language |
unknown |
topic |
Arctic engineering Arctic vehicles computational fluid dynamics flow velocity mooring software testing Power and Energy |
spellingShingle |
Arctic engineering Arctic vehicles computational fluid dynamics flow velocity mooring software testing Power and Energy Florager, Curtis Balash, Cheslav Vortex-induced motion of a free-standing riser below the critical mass ratio |
topic_facet |
Arctic engineering Arctic vehicles computational fluid dynamics flow velocity mooring software testing Power and Energy |
description |
The presented work studied the vortex-induced motion (VIM) response of a free-standing riser (FSR) with varied riser length and buoyancy can (BC) mass with an ultimate aim to find a combination that would reduce the motion of the system. Specifically, four model configurations were experimentally tested in a flume tank over a range of flow velocities, with the BC motion recorded by a submersible camera positioned directly above the model; consequently, inline (IL) and crossflow (CF) amplitudes were estimated with a motion tracking software. In the pre-resonant flow regime, non-dimensionally, minimal differences were observed between the CF amplitudes, and the IL motion was reduced with a longer riser. Given the extreme length of full-scale FSRs and inherent low natural frequency, it is impractical to increase the riser tension to a point where VIM would not occur under normal environmental conditions. Alternatively, increasing the mass ratio of the BC so that it is above the critical mass ratio of 0.54 (the ratio of the mass of the body to the mass of the fluid) would limit the resonant flow velocities to a finite range, but a larger BC may not be an economically viable solution, and because of the increased diameter, it would experience a larger CF amplitude during resonance. Further study into the prevention of VIM of an FSR by varying the riser length and BC mass is unlikely to be beneficial. |
format |
Text |
author |
Florager, Curtis Balash, Cheslav |
author_facet |
Florager, Curtis Balash, Cheslav |
author_sort |
Florager, Curtis |
title |
Vortex-induced motion of a free-standing riser below the critical mass ratio |
title_short |
Vortex-induced motion of a free-standing riser below the critical mass ratio |
title_full |
Vortex-induced motion of a free-standing riser below the critical mass ratio |
title_fullStr |
Vortex-induced motion of a free-standing riser below the critical mass ratio |
title_full_unstemmed |
Vortex-induced motion of a free-standing riser below the critical mass ratio |
title_sort |
vortex-induced motion of a free-standing riser below the critical mass ratio |
publisher |
Edith Cowan University, Research Online, Perth, Western Australia |
publishDate |
2014 |
url |
https://ro.ecu.edu.au/ecuworkspost2013/3667 https://doi.org/10.1115/OMAE2017-61399 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Research outputs 2014 to 2021 |
op_relation |
https://ro.ecu.edu.au/ecuworkspost2013/3667 https://doi.org/10.1115/OMAE2017-61399 |
op_rights |
subscription content |
op_doi |
https://doi.org/10.1115/OMAE2017-61399 |
container_title |
Volume 2: Prof. Carl Martin Larsen and Dr. Owen Oakley Honoring Symposia on CFD and VIV |
_version_ |
1766332020551581696 |