A wind tunnel study of the mean airflow around a simple representation of a merchant ship
A wind tunnel study of the mean airflow around a simple representation of a merchant ship
An investigation has been carried out to measure mean velocities above a solid block located in a wind tunnel. A Particle Image Velocimetry (PIV) system was used. The purpose of the investigation was to quantify the change in the mean flow speed caused by the bluff body and hence to determine the possible bias in wind speed measurement made from anemometers located above the superstructure of merchant ships. Possible sources of experimental error were investigated and resulted in; a) a blockage ratio correction which varied with position, b) the use of 2-dimensional maps of the free stream flow to obtain reference velocities and c) an estimate of a residual bias of up to 4 % in the PIV wind speed data. The wind speed was accelerated by up to 28 % compared to the free stream (or undistorted) wind speed. Close to the top of the block the wind speed is severely decelerated and the airflow reverses in direction. There was no dependence of either the pattern of the flow or of the magnitude of the wind speed bias on changes in wind directions of up to 30 degrees.
Southampton Oceanography Centre, University of Southampton
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07
2004
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07
Moat, B.I., Molland, A.F. and Yelland, M.J.
(2004)
A wind tunnel study of the mean airflow around a simple representation of a merchant ship
(Southampton Oceanography Centre Research and Consultancy Report, 87)
Southampton, UK.
Southampton Oceanography Centre, University of Southampton
21pp.
Record type:
Monograph
(Project Report)
Abstract
An investigation has been carried out to measure mean velocities above a solid block located in a wind tunnel. A Particle Image Velocimetry (PIV) system was used. The purpose of the investigation was to quantify the change in the mean flow speed caused by the bluff body and hence to determine the possible bias in wind speed measurement made from anemometers located above the superstructure of merchant ships. Possible sources of experimental error were investigated and resulted in; a) a blockage ratio correction which varied with position, b) the use of 2-dimensional maps of the free stream flow to obtain reference velocities and c) an estimate of a residual bias of up to 4 % in the PIV wind speed data. The wind speed was accelerated by up to 28 % compared to the free stream (or undistorted) wind speed. Close to the top of the block the wind speed is severely decelerated and the airflow reverses in direction. There was no dependence of either the pattern of the flow or of the magnitude of the wind speed bias on changes in wind directions of up to 30 degrees.
More information
Published date: 2004
Identifiers
Local EPrints ID: 23057
URI: http://eprints.soton.ac.uk/id/eprint/23057
PURE UUID: 4f250249-202e-45b7-a249-ce7e541aa238
Catalogue record
Date deposited: 03 Apr 2006
Last modified: 15 Mar 2024 06:43
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Contributors
Author:
B.I. Moat
Author:
M.J. Yelland
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