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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on July 31, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(9):1552-1558; doi:10.1093/icesjms/fsn126
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A method for improving the dynamic simulation efficiency of underwater flexible structures by implementing non-active points in modelling

Ji Hoon Lee1, Ludvig Karlsen1 and Chun Woo Lee2

1 Department of Marine Technology, Norwegian University of Science and Technology, Otto Nielsens vei 10, NO-7491, Trondheim, Norway
2 Division of Marine Production System Management, Pukyong National University, Daeyeon 3-Dong, Nam-Gu, 599-1, Busan, Korea

Correspondence to L. Karlsen: tel: +47 735 95588; fax: +47 735 95983; e-mail: ludvig.karlsen{at}ntnu.no.

Lee, J. H., Karlsen, L., and Lee, C. W. 2008. A method for improving the dynamic simulation efficiency of underwater flexible structures by implementing non-active points in modelling. – ICES Journal of Marine Science, 65: 1552–1558.

The implementation of non-active points into a conventional mass spring network for improving the simulation efficiency of fishing gear systems is presented. A conventional mass spring network generally consists of just active mass points involved in physical calculations, and non-active points located between neighbouring active mass points are not involved in the calculations. For each time-step, new positions for non-active points are calculated based on the active mass point positions already calculated for that time-step. By replacing some active mass points with non-active ones, computing time can be reduced while maintaining accuracy in the ground-interference simulation. As this method is more efficient in demonstrating the behaviour of fishing gear such as bottom longlines and bottom gillnets, an adaptive non-active point model represents the shape of a system more accurately than one consisting of just active mass points.

Keywords: dynamic simulation, fishing gears, hydrodynamics, non-active point, physical modelling, underwater flexible structures

Received 7 February 2008; accepted 25 June 2008; advance access publication 31 July 2008.


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