Current blockage: Reduced forces on offshore space-frame structures

P. H. Taylor

doi:10.4043/6519-ms

Current blockage: Reduced forces on offshore space-frame structures

^*Corresponding author for this work

Shell Research B.V.

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings published in a book › peer-review

Abstract

The standard method of estimating the fluid loading on an offshore space-frame structure makes use of the Morison equation to calculate the force exerted on each structural element and ignores the influence of the rest of the structure. However, the use in load calculations of the steady current measured or estimated for the open sea far away from the structure (platform) leads to a significant overestimate of the current-induced components of the loading because the average current within the structure is lower than that far upstream. This study describes a method for calculating this blockage of the free-stream current at the structure and the resulting global loading on the structure. This simple method is validated against measurements from a wide range of experiments.

Original language	English
Title of host publication	Offshore Technology Conference, OTC 1991
Publisher	Offshore Technology Conference
Pages	199-205
Number of pages	7
ISBN (Print)	9781613990872
DOIs	https://doi.org/10.4043/6519-ms
Publication status	Published - 1991
Externally published	Yes
Event	23rd Offshore Technology Conference, OTC 1991 - Houston, United States Duration: 4 May 1991 → 7 May 1991

Publication series

Name	Proceedings of the Annual Offshore Technology Conference
ISSN (Print)	0160-3663

Conference

Conference	23rd Offshore Technology Conference, OTC 1991
Country/Territory	United States
City	Houston
Period	4/05/91 → 7/05/91

ASJC Scopus subject areas

Safety, Risk, Reliability and Quality
Ocean Engineering
Energy Engineering and Power Technology
Mechanical Engineering

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10.4043/6519-ms

Cite this

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abstract = "The standard method of estimating the fluid loading on an offshore space-frame structure makes use of the Morison equation to calculate the force exerted on each structural element and ignores the influence of the rest of the structure. However, the use in load calculations of the steady current measured or estimated for the open sea far away from the structure (platform) leads to a significant overestimate of the current-induced components of the loading because the average current within the structure is lower than that far upstream. This study describes a method for calculating this blockage of the free-stream current at the structure and the resulting global loading on the structure. This simple method is validated against measurements from a wide range of experiments.",

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AB - The standard method of estimating the fluid loading on an offshore space-frame structure makes use of the Morison equation to calculate the force exerted on each structural element and ignores the influence of the rest of the structure. However, the use in load calculations of the steady current measured or estimated for the open sea far away from the structure (platform) leads to a significant overestimate of the current-induced components of the loading because the average current within the structure is lower than that far upstream. This study describes a method for calculating this blockage of the free-stream current at the structure and the resulting global loading on the structure. This simple method is validated against measurements from a wide range of experiments.

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Current blockage: Reduced forces on offshore space-frame structures

Abstract

Publication series

Conference

ASJC Scopus subject areas

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