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

Abstract

Abstract 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.