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Numerical investigation of the influence of propeller to the interference drag of twin prolate spheroids at various longitudinal offsets and transverse separations.

Numerical investigation of the influence of propeller to the interference drag of twin prolate spheroids at various longitudinal offsets and transverse separations.
Numerical investigation of the influence of propeller to the interference drag of twin prolate spheroids at various longitudinal offsets and transverse separations.
The purpose of this paper is to provide guidance for operators on suitable spacing for multiple vehicles’ missions. This paper investigates the combined drag of a pair of propelled prolate spheroids and compared to the towed models for the length Reynolds Number of 3.2×106. The model has a length-diameter ratio of 6:1. A series of configuration of a pair of spheroids is simulated at various longitudinal offsets and transverse separations. Three-dimensional simulations are performed using a commercial Reynolds Averaged Navier Stokes (RANS) Computational Fluid Dynamics code ANSYS CFX 12.1 with the SST turbulence closure model. In each case, the fluid domain has a mesh size of approximately nine million cells including inflated prism layers to capture the boundary layer. Mesh convergence is tested and then validated with wind tunnel test results. The drag of each spheroid is compared against the benchmark drag of a single hull. The three-dimensional cylinder is modelled to simulate the thrust distribution of propeller. The drag of the propelled model is compared against the single bare hull model. The results show that the transverse separations and longitudinal offsets determine the interaction drag between both hulls. The increasing of separation results in lower interference drag. The decreasing of offset results in higher drag reduction. By implementing the body force propeller, the combined drag and drag of the follower is interfered by the accelerated flow. Based on the numerical information, operators can determine the optimal configurations in transvers separation and longitudinal offset based on energy considerations
0975-1033
964-970
Rattanasiri, Pareecha
5e31f120-364f-48fe-a783-a199e21b3689
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Phillips, Alexander B.
f565b1da-6881-4e2a-8729-c082b869028f
Rattanasiri, Pareecha
5e31f120-364f-48fe-a783-a199e21b3689
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Phillips, Alexander B.
f565b1da-6881-4e2a-8729-c082b869028f

Rattanasiri, Pareecha, Wilson, P.A. and Phillips, Alexander B. (2013) Numerical investigation of the influence of propeller to the interference drag of twin prolate spheroids at various longitudinal offsets and transverse separations. Indian Journal of Geo-Marine Sciences, 42 (8), 964-970.

Record type: Article

Abstract

The purpose of this paper is to provide guidance for operators on suitable spacing for multiple vehicles’ missions. This paper investigates the combined drag of a pair of propelled prolate spheroids and compared to the towed models for the length Reynolds Number of 3.2×106. The model has a length-diameter ratio of 6:1. A series of configuration of a pair of spheroids is simulated at various longitudinal offsets and transverse separations. Three-dimensional simulations are performed using a commercial Reynolds Averaged Navier Stokes (RANS) Computational Fluid Dynamics code ANSYS CFX 12.1 with the SST turbulence closure model. In each case, the fluid domain has a mesh size of approximately nine million cells including inflated prism layers to capture the boundary layer. Mesh convergence is tested and then validated with wind tunnel test results. The drag of each spheroid is compared against the benchmark drag of a single hull. The three-dimensional cylinder is modelled to simulate the thrust distribution of propeller. The drag of the propelled model is compared against the single bare hull model. The results show that the transverse separations and longitudinal offsets determine the interaction drag between both hulls. The increasing of separation results in lower interference drag. The decreasing of offset results in higher drag reduction. By implementing the body force propeller, the combined drag and drag of the follower is interfered by the accelerated flow. Based on the numerical information, operators can determine the optimal configurations in transvers separation and longitudinal offset based on energy considerations

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Accepted/In Press date: 15 August 2013
Published date: 10 December 2013
Organisations: National Oceanography Centre, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 358089
URI: http://eprints.soton.ac.uk/id/eprint/358089
ISSN: 0975-1033
PURE UUID: 02b712e6-9de8-4053-ac3e-f2f03eedd8b5
ORCID for P.A. Wilson: ORCID iD orcid.org/0000-0002-6939-682X
ORCID for Alexander B. Phillips: ORCID iD orcid.org/0000-0003-3234-8506

Catalogue record

Date deposited: 04 Oct 2013 09:03
Last modified: 12 Dec 2021 02:35

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Contributors

Author: Pareecha Rattanasiri
Author: P.A. Wilson ORCID iD
Author: Alexander B. Phillips ORCID iD

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