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The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations

The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations
The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations
This study investigates the occurrence of irregular frequencies in a seakeeping analysis of a ship moving with forward speed. This is achieved by formulating the interior virtual flow Dirichlet or Neumann eigenvalue problem. A theoretical analysis of a rectangular box travelling and oscillating in waves reveals that in the forward speed case, apart from the singular irregular frequency at zero encounter frequency, no irregular frequencies exist whilst at zero forward speed multiple irregular frequencies are observed confirming previous findings. These theoretical predictions are further verified by numerical calculations involving the rectangular box and a Series 60, CB=0.70, hull.

0029-8018
235-247
Du, S.X.
f18078dc-6557-43db-87d2-29839c98bf8c
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Price, W.G.
b7888f47-e3fc-46f4-9fb9-7839052ff17c
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf
Du, S.X.
f18078dc-6557-43db-87d2-29839c98bf8c
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Price, W.G.
b7888f47-e3fc-46f4-9fb9-7839052ff17c
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf

Du, S.X., Hudson, D.A., Price, W.G. and Temarel, P. (2011) The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations. Ocean Engineering, 38 (1), 235-247. (doi:10.1016/j.oceaneng.2010.10.005).

Record type: Article

Abstract

This study investigates the occurrence of irregular frequencies in a seakeeping analysis of a ship moving with forward speed. This is achieved by formulating the interior virtual flow Dirichlet or Neumann eigenvalue problem. A theoretical analysis of a rectangular box travelling and oscillating in waves reveals that in the forward speed case, apart from the singular irregular frequency at zero encounter frequency, no irregular frequencies exist whilst at zero forward speed multiple irregular frequencies are observed confirming previous findings. These theoretical predictions are further verified by numerical calculations involving the rectangular box and a Series 60, CB=0.70, hull.

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More information

Published date: January 2011
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 169005
URI: http://eprints.soton.ac.uk/id/eprint/169005
ISSN: 0029-8018
PURE UUID: 8320b150-2c27-4d0a-b2af-ae460a8e3b29
ORCID for D.A. Hudson: ORCID iD orcid.org/0000-0002-2012-6255
ORCID for P. Temarel: ORCID iD orcid.org/0000-0003-2921-1242

Catalogue record

Date deposited: 22 Dec 2010 12:06
Last modified: 09 Jan 2022 02:47

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Contributors

Author: S.X. Du
Author: D.A. Hudson ORCID iD
Author: W.G. Price
Author: P. Temarel ORCID iD

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