Vortex shedding of hulls in close proximity with relative motion

Ian A. Milne; J. Michael R. Graham

doi:10.1115/OMAE2018-77151

Vortex shedding of hulls in close proximity with relative motion

Ian A. Milne, J. Michael R. Graham

Oceans Graduate School

Research output: Chapter in Book/Conference paper › Conference paper › peer-review

4 Citations (Web of Science)

Abstract

The safe and efficient offloading of liquid natural gas (LNG) in a side-by-side configuration has emphasised the need to accurately quantify the hydrodynamic responses of floating bodies when located in very close proximity. A new series of computational results are presented for the forced roll of a hull in the presence of a second body representative of a floating FLNG facility. The vortex shedding phenomenon which provides a significant contribution to the damping of an isolated hull, is demonstrated to be modified by the presence of the second body. The total damping coefficients were found to be significantly reduced by approximately 50 percent for the very small gap widths considered. It is shown that in addition to the modification of the local shedding dynamics, the variation in the pressure field owing to the presence of the second body also contributes significantly to the reduction in the damping. The findings will be of particular interest to the offshore industry for improving and optimising offloading practices.

Original language	English
Title of host publication	Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publication	OMAE 2018
Place of Publication	USA
Publisher	AMER SOC MECHANICAL ENGINEERS
Number of pages	9
Volume	7A
ISBN (Electronic)	9780791851265
ISBN (Print)	9780791851265
DOIs	https://doi.org/10.1115/OMAE2018-77151 https://doi.org/10.1115/OMAE2018-77151
Publication status	Published - 2018
Event	ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018 - Madrid Marriott Auditorium Hotel & Conference Centre, Madrid, Spain Duration: 17 Jun 2018 → 22 Jun 2018 https://www.asme.org/events/omae

Publication series

Name	Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering
Publisher	AMER SOC MECHANICAL ENGINEERS
ISSN (Print)	2153-4772

Conference

Conference	ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018
Abbreviated title	OMAE 2018
Country/Territory	Spain
City	Madrid
Period	17/06/18 → 22/06/18
Internet address	https://www.asme.org/events/omae

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Milne, I. A., & Graham, J. M. R. (2018). Vortex shedding of hulls in close proximity with relative motion. In Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering: OMAE 2018 (Vol. 7A). [V07AT06A037] (Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering). AMER SOC MECHANICAL ENGINEERS. https://doi.org/10.1115/OMAE2018-77151, https://doi.org/10.1115/OMAE2018-77151

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title = "Vortex shedding of hulls in close proximity with relative motion",

abstract = "The safe and efficient offloading of liquid natural gas (LNG) in a side-by-side configuration has emphasised the need to accurately quantify the hydrodynamic responses of floating bodies when located in very close proximity. A new series of computational results are presented for the forced roll of a hull in the presence of a second body representative of a floating FLNG facility. The vortex shedding phenomenon which provides a significant contribution to the damping of an isolated hull, is demonstrated to be modified by the presence of the second body. The total damping coefficients were found to be significantly reduced by approximately 50 percent for the very small gap widths considered. It is shown that in addition to the modification of the local shedding dynamics, the variation in the pressure field owing to the presence of the second body also contributes significantly to the reduction in the damping. The findings will be of particular interest to the offshore industry for improving and optimising offloading practices.",

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booktitle = "Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering",

note = "ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018, OMAE 2018 ; Conference date: 17-06-2018 Through 22-06-2018",

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Milne, IA & Graham, JMR 2018, Vortex shedding of hulls in close proximity with relative motion. in Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering: OMAE 2018. vol. 7A, V07AT06A037, Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering, AMER SOC MECHANICAL ENGINEERS, USA, ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018, Madrid, Spain, 17/06/18. https://doi.org/10.1115/OMAE2018-77151, https://doi.org/10.1115/OMAE2018-77151

Vortex shedding of hulls in close proximity with relative motion. / Milne, Ian A.; Graham, J. Michael R.

Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering: OMAE 2018. Vol. 7A USA : AMER SOC MECHANICAL ENGINEERS, 2018. V07AT06A037 (Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering).

Research output: Chapter in Book/Conference paper › Conference paper › peer-review

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T1 - Vortex shedding of hulls in close proximity with relative motion

AU - Milne, Ian A.

AU - Graham, J. Michael R.

PY - 2018

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N2 - The safe and efficient offloading of liquid natural gas (LNG) in a side-by-side configuration has emphasised the need to accurately quantify the hydrodynamic responses of floating bodies when located in very close proximity. A new series of computational results are presented for the forced roll of a hull in the presence of a second body representative of a floating FLNG facility. The vortex shedding phenomenon which provides a significant contribution to the damping of an isolated hull, is demonstrated to be modified by the presence of the second body. The total damping coefficients were found to be significantly reduced by approximately 50 percent for the very small gap widths considered. It is shown that in addition to the modification of the local shedding dynamics, the variation in the pressure field owing to the presence of the second body also contributes significantly to the reduction in the damping. The findings will be of particular interest to the offshore industry for improving and optimising offloading practices.

AB - The safe and efficient offloading of liquid natural gas (LNG) in a side-by-side configuration has emphasised the need to accurately quantify the hydrodynamic responses of floating bodies when located in very close proximity. A new series of computational results are presented for the forced roll of a hull in the presence of a second body representative of a floating FLNG facility. The vortex shedding phenomenon which provides a significant contribution to the damping of an isolated hull, is demonstrated to be modified by the presence of the second body. The total damping coefficients were found to be significantly reduced by approximately 50 percent for the very small gap widths considered. It is shown that in addition to the modification of the local shedding dynamics, the variation in the pressure field owing to the presence of the second body also contributes significantly to the reduction in the damping. The findings will be of particular interest to the offshore industry for improving and optimising offloading practices.

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DO - 10.1115/OMAE2018-77151

M3 - Conference paper

SN - 9780791851265

VL - 7A

T3 - Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering

BT - Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering

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Milne IA, Graham JMR. Vortex shedding of hulls in close proximity with relative motion. In Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering: OMAE 2018. Vol. 7A. USA: AMER SOC MECHANICAL ENGINEERS. 2018. V07AT06A037. (Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering). https://doi.org/10.1115/OMAE2018-77151, https://doi.org/10.1115/OMAE2018-77151

Vortex shedding of hulls in close proximity with relative motion

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