Possible biases in wind speed measurements from merchant ships
Possible biases in wind speed measurements from merchant ships
Wind speed measurements obtained from ship-mounted anemometers are biased by the presence of the ship which distorts the airflow to the anemometer. Until recently this bias had only been quantified for a few well-exposed anemometer sites on individual research ships, whereas the magnitude and even the sign of the bias was unknown for anemometers on merchant ships. Three-dimensional numerical simulations of the airflow over a typical tanker/bulk carrier have been performed to quantify the pattern of the airflow above the ship’s bridge. The accuracy of the numerical simulations has been verified by comparison to wind tunnel studies. Typically, the flow is accelerated by up to 18±6 % or decelerated by 100% depending on position. In practice, an anemometer located above the bridge should be mounted as high and as far forwards as possible.
CFD, Bluff body, airflow distortion, ships, VOS
537-540
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
15 July 2004
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Moat, B.I., Yelland, M.J. and Molland, A.F.
(2004)
Possible biases in wind speed measurements from merchant ships.
5th International Colloquium on Bluff Body Aerodynamics and Applications, Ottawa, Canada.
11 - 15 Jul 2004.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Wind speed measurements obtained from ship-mounted anemometers are biased by the presence of the ship which distorts the airflow to the anemometer. Until recently this bias had only been quantified for a few well-exposed anemometer sites on individual research ships, whereas the magnitude and even the sign of the bias was unknown for anemometers on merchant ships. Three-dimensional numerical simulations of the airflow over a typical tanker/bulk carrier have been performed to quantify the pattern of the airflow above the ship’s bridge. The accuracy of the numerical simulations has been verified by comparison to wind tunnel studies. Typically, the flow is accelerated by up to 18±6 % or decelerated by 100% depending on position. In practice, an anemometer located above the bridge should be mounted as high and as far forwards as possible.
More information
Published date: 15 July 2004
Venue - Dates:
5th International Colloquium on Bluff Body Aerodynamics and Applications, Ottawa, Canada, 2004-07-11 - 2004-07-15
Keywords:
CFD, Bluff body, airflow distortion, ships, VOS
Identifiers
Local EPrints ID: 9028
URI: http://eprints.soton.ac.uk/id/eprint/9028
PURE UUID: 2a727331-fab3-4f4c-a3fe-290c35eb745a
Catalogue record
Date deposited: 19 Oct 2004
Last modified: 15 Mar 2024 04:53
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Contributors
Author:
B.I. Moat
Author:
M.J. Yelland
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