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Numerical investigation of an influence of square cylinder crossovers on twin bare hulls in close proximity

Numerical investigation of an influence of square cylinder crossovers on twin bare hulls in close proximity
Numerical investigation of an influence of square cylinder crossovers on twin bare hulls in close proximity
This paper investigates the influence of two crossovers on twin bare spheroids in close proximity. Firstly, to examine the impact of the crossovers to the flow behaviour and overall drag coefficient of spheroids. Secondly, to compare the drag coefficient for various speeds. The CFD RANS-SST with a commercial code ANSYS CFX simulation is performed for the fully submerged twin spheroids with transverse separation (S/D) of 1.02; where S is the distance between centreline to centreline and D is the maximum diameter of a spheroid. The Reynolds Numbers used are 2 × 106, 3 × 106, and 4 × 106. The results show that each spheroids experience an additional 20% drag which is dominated by crossovers. The drag coefficient of small volume crossovers between spheroids is 10 times higher than the drag of each spheroids, consequently, the total drag of system is increased by 11 times compares to twin bare spheroids system. Increasing speed results in the drag reduction. At the Reynolds Number 2 × 106 shows the highest drag coefficient of twin hulls for both cases (with or without crossovers). The result suggests the use of twin bare hulls without crossovers in the fleet, an application; for example, a fleet of small autonomous underwater vehicles.
Rattanasiri, Pareecha
db2e4b66-fef8-4a0e-b723-055ab2b5a7cc
Wilson, Philip A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Rattanasiri, Pareecha
db2e4b66-fef8-4a0e-b723-055ab2b5a7cc
Wilson, Philip A.
8307fa11-5d5e-47f6-9961-9d43767afa00

Rattanasiri, Pareecha and Wilson, Philip A. (2016) Numerical investigation of an influence of square cylinder crossovers on twin bare hulls in close proximity. The 7th TSME International Conference on Mechanical Engineering, Chiang Mai, Thailand. 13 - 16 Dec 2016. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper investigates the influence of two crossovers on twin bare spheroids in close proximity. Firstly, to examine the impact of the crossovers to the flow behaviour and overall drag coefficient of spheroids. Secondly, to compare the drag coefficient for various speeds. The CFD RANS-SST with a commercial code ANSYS CFX simulation is performed for the fully submerged twin spheroids with transverse separation (S/D) of 1.02; where S is the distance between centreline to centreline and D is the maximum diameter of a spheroid. The Reynolds Numbers used are 2 × 106, 3 × 106, and 4 × 106. The results show that each spheroids experience an additional 20% drag which is dominated by crossovers. The drag coefficient of small volume crossovers between spheroids is 10 times higher than the drag of each spheroids, consequently, the total drag of system is increased by 11 times compares to twin bare spheroids system. Increasing speed results in the drag reduction. At the Reynolds Number 2 × 106 shows the highest drag coefficient of twin hulls for both cases (with or without crossovers). The result suggests the use of twin bare hulls without crossovers in the fleet, an application; for example, a fleet of small autonomous underwater vehicles.

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More information

Accepted/In Press date: 1 September 2016
e-pub ahead of print date: December 2016
Published date: 4 December 2016
Venue - Dates: The 7th TSME International Conference on Mechanical Engineering, Chiang Mai, Thailand, 2016-12-13 - 2016-12-16
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 399872
URI: http://eprints.soton.ac.uk/id/eprint/399872
PURE UUID: 94969b60-d6be-4524-9cfb-e99e8ed37a43
ORCID for Philip A. Wilson: ORCID iD orcid.org/0000-0002-6939-682X

Catalogue record

Date deposited: 05 Sep 2016 08:27
Last modified: 18 Feb 2021 16:34

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