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Wind tunnel investigation of a pair of ellipsoids in close proximity

Wind tunnel investigation of a pair of ellipsoids in close proximity
Wind tunnel investigation of a pair of ellipsoids in close proximity
The results of wind tunnel experiments on a pair of ellipsoids in close proximity are presented. The experiments represented a reflex model of a multihull ship and investigated the components of viscous drag and viscous interaction effects between the hulls.

The tests were carried out with and without turbulence transition strip at separation to length (S/L) ratios of 0.27, 0.37, 0.47 and 0.57 and at Reynolds Number values up to 3.2 x 106. Tests were included with a single-hull configuration with which the resistance characteristics of the twin-hull configuration could be compared.

Results are presented for each S/L configuration as drag and sideforce coefficients at zero incidence. Surface pressure distributions over the hull were also obtained in order to provide a detailed knowledge of the distribution of forces over the hulls.

The overall drag coefficients and pressure distributions were comparable with previously published data for single bodies of revolution in isolation. The results with two bodies demonstrated the existence of a viscous drag interaction between the bodies, and that this interaction is maintained at an approximately constant level up to about S/L = 0.5.
98
University of Southampton
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Utama, I.K.A.P.
0449bcc4-a91f-46d8-b337-5885d64d01fe
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Utama, I.K.A.P.
0449bcc4-a91f-46d8-b337-5885d64d01fe

Molland, A.F. and Utama, I.K.A.P. (1997) Wind tunnel investigation of a pair of ellipsoids in close proximity (Ship Science Reports, 98) Southampton, UK. University of Southampton 83pp.

Record type: Monograph (Project Report)

Abstract

The results of wind tunnel experiments on a pair of ellipsoids in close proximity are presented. The experiments represented a reflex model of a multihull ship and investigated the components of viscous drag and viscous interaction effects between the hulls.

The tests were carried out with and without turbulence transition strip at separation to length (S/L) ratios of 0.27, 0.37, 0.47 and 0.57 and at Reynolds Number values up to 3.2 x 106. Tests were included with a single-hull configuration with which the resistance characteristics of the twin-hull configuration could be compared.

Results are presented for each S/L configuration as drag and sideforce coefficients at zero incidence. Surface pressure distributions over the hull were also obtained in order to provide a detailed knowledge of the distribution of forces over the hulls.

The overall drag coefficients and pressure distributions were comparable with previously published data for single bodies of revolution in isolation. The results with two bodies demonstrated the existence of a viscous drag interaction between the bodies, and that this interaction is maintained at an approximately constant level up to about S/L = 0.5.

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More information

Published date: 1997
Additional Information: ISSN 0140-3818

Identifiers

Local EPrints ID: 46454
URI: http://eprints.soton.ac.uk/id/eprint/46454
PURE UUID: c6308339-7c39-447a-88c9-336f110d3109

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Date deposited: 29 Jun 2007
Last modified: 15 Mar 2024 09:22

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Contributors

Author: A.F. Molland
Author: I.K.A.P. Utama

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