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Numerical investigation of a fleet of towed AUVs

Numerical investigation of a fleet of towed AUVs
Numerical investigation of a fleet of towed AUVs
This paper investigates the influence on the fleet of the drag of multiple towed prolate spheroids to determine the hydrodynamic effect of the viscous interaction between hulls and to study the influence of the configuration?s shape of multiple hulls in the vee and echelon formations. A series of CFD RANS-SST simulations has been performed at the Reynolds Number 3.2×106 by a commercial code ANSYS CFX 12.1. Mesh convergence is tested and then validated with experimental and empirical results. The drag of each spheroid is compared against the benchmark drag of a single hull. The results show that the spacing between two hulls determines the individual drag and combined drag. The dominant spacing has been classified into seven zones based on the drag characteristic of twin towed models. Regions are characterised to parallel, echelon, no gain, push, drafting, low interaction, and no interaction. Both the multi-vehicle vee and echelon configurations show limited influence against that of the entire fleet?s energy budget. For an individual spheroid where a lower propulsion cost is required, then the use of three/four in vee or echelon formation should be considered. Based on this numerical information, operators can determine the optimal fleet configuration based on energy considerations.
0029-8018
25-35
Rattanasiri, Pareecha
5e31f120-364f-48fe-a783-a199e21b3689
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Phillips, A.B.
f565b1da-6881-4e2a-8729-c082b869028f
Rattanasiri, Pareecha
5e31f120-364f-48fe-a783-a199e21b3689
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Phillips, A.B.
f565b1da-6881-4e2a-8729-c082b869028f

Rattanasiri, Pareecha, Wilson, P.A. and Phillips, A.B. (2014) Numerical investigation of a fleet of towed AUVs. Ocean Engineering, 80c, 25-35. (doi:10.1016/j.oceaneng.2014.02.001).

Record type: Article

Abstract

This paper investigates the influence on the fleet of the drag of multiple towed prolate spheroids to determine the hydrodynamic effect of the viscous interaction between hulls and to study the influence of the configuration?s shape of multiple hulls in the vee and echelon formations. A series of CFD RANS-SST simulations has been performed at the Reynolds Number 3.2×106 by a commercial code ANSYS CFX 12.1. Mesh convergence is tested and then validated with experimental and empirical results. The drag of each spheroid is compared against the benchmark drag of a single hull. The results show that the spacing between two hulls determines the individual drag and combined drag. The dominant spacing has been classified into seven zones based on the drag characteristic of twin towed models. Regions are characterised to parallel, echelon, no gain, push, drafting, low interaction, and no interaction. Both the multi-vehicle vee and echelon configurations show limited influence against that of the entire fleet?s energy budget. For an individual spheroid where a lower propulsion cost is required, then the use of three/four in vee or echelon formation should be considered. Based on this numerical information, operators can determine the optimal fleet configuration based on energy considerations.

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Submitted date: 25 April 2013
Accepted/In Press date: 4 February 2014
Published date: 1 April 2014
Organisations: National Oceanography Centre, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 361963
URI: http://eprints.soton.ac.uk/id/eprint/361963
ISSN: 0029-8018
PURE UUID: 8aff8623-0396-4692-95ff-52942e950ae4
ORCID for P.A. Wilson: ORCID iD orcid.org/0000-0002-6939-682X
ORCID for A.B. Phillips: ORCID iD orcid.org/0000-0003-3234-8506

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Date deposited: 07 Feb 2014 11:35
Last modified: 27 Apr 2022 01:47

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Contributors

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

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