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Blockage effects on resistance prediction of high-speed catamarans

Blockage effects on resistance prediction of high-speed catamarans
Blockage effects on resistance prediction of high-speed catamarans
Model experiment is the most reliable method to estimate ship resistance; however, price and complexities are the most disadvantage factors. Another aspect that affects the precision of the results are blockage effects due to tank dimension and model size. Some correction procedures introduced by ITTC are widely used. However only resistance components that can be corrected while flow field and wave elevation cannot be justified using the blockage correction procedures. To demonstrate how the blockage affects the flow around catamaran, this study focuses on resistance prediction and flow characteristics around high-speed catamarans using CFD code with RANS equations. Two Southampton University towing tanks – Solent and Boldrewood – are compared. The NPL 5b model is used as it is widely investigated and used in the commercial applications. Four Froude numbers (Fn = 0.273, 0.433, 0.70 and 0.90) are investigated. CFD results show that resistance components measured from the higher blockage towing tank are higher than the bigger tank. Wave contour plots and wave cut show that the higher blockage towing tank causes the higher wave elevation due to the reflection of the wall which results in differences for the wave resistance prediction between the two towing tanks.
2229-2152
23-32
Srinakaew, Sarawuth
94f81053-b6ab-4f21-b79c-05a86a350ae6
Taunton, Dominic
10bfbe83-c4c2-49c6-94c0-2de8098c648c
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7
Srinakaew, Sarawuth
94f81053-b6ab-4f21-b79c-05a86a350ae6
Taunton, Dominic
10bfbe83-c4c2-49c6-94c0-2de8098c648c
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7

Srinakaew, Sarawuth, Taunton, Dominic and Hudson, Dominic (2019) Blockage effects on resistance prediction of high-speed catamarans. Journal of Research and Applications in Mechanical Engineering, 7 (1), 23-32. (doi:10.14456/jrame.2019.3).

Record type: Article

Abstract

Model experiment is the most reliable method to estimate ship resistance; however, price and complexities are the most disadvantage factors. Another aspect that affects the precision of the results are blockage effects due to tank dimension and model size. Some correction procedures introduced by ITTC are widely used. However only resistance components that can be corrected while flow field and wave elevation cannot be justified using the blockage correction procedures. To demonstrate how the blockage affects the flow around catamaran, this study focuses on resistance prediction and flow characteristics around high-speed catamarans using CFD code with RANS equations. Two Southampton University towing tanks – Solent and Boldrewood – are compared. The NPL 5b model is used as it is widely investigated and used in the commercial applications. Four Froude numbers (Fn = 0.273, 0.433, 0.70 and 0.90) are investigated. CFD results show that resistance components measured from the higher blockage towing tank are higher than the bigger tank. Wave contour plots and wave cut show that the higher blockage towing tank causes the higher wave elevation due to the reflection of the wall which results in differences for the wave resistance prediction between the two towing tanks.

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JRAME_Blockage Effects on Resistance Prediction of High-Speed Catamaran - Accepted Manuscript
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More information

Submitted date: 25 February 2019
Accepted/In Press date: 7 May 2019
Published date: 27 June 2019

Identifiers

Local EPrints ID: 432707
URI: http://eprints.soton.ac.uk/id/eprint/432707
ISSN: 2229-2152
PURE UUID: 0df7bdda-edea-4a51-bdcf-7b3f33fdc9dd
ORCID for Dominic Taunton: ORCID iD orcid.org/0000-0002-6865-089X
ORCID for Dominic Hudson: ORCID iD orcid.org/0000-0002-2012-6255

Catalogue record

Date deposited: 24 Jul 2019 16:30
Last modified: 22 Nov 2021 02:43

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Contributors

Author: Sarawuth Srinakaew
Author: Dominic Taunton ORCID iD
Author: Dominic Hudson ORCID iD

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