Advanced numerical technique of ship collision considering fluid effect

Abstract

Numerical technique to include fluid domain has been known that almost unique way to consider the fluid effect in modeling fluid-structure interaction simulations, but requires heavy computation time under high performance computing system. This paper introduces a new approach without including fluid elements where it simulates hydro-forces on striking and struck ships. This innovation came to be possible by imbedding a Fortran user-subroutine code into a commercial finite element code. We applied the user-subroutine to a simplified box model to see the same motion responses. The simulation results well coincided with coupled Eulerian-Lagrangian analysis results with dramatically reduced computing cost. The user-subroutine was also applied to simulate a simple ship-to-ship collision analysis. The list angle and damage extents were compared for the cases with and without the user-subroutine. The effects of hydro-forces were significant in terms of the list angle and damage extent. ？ 2020 Taylor and Francis Group, London.