The simplified interaction tool for efficient and accurate underwater shock analysis of naval ships
van Aanhold, J.E.
In order to satisfy the need for good quality UNDEX response estimates of naval ships, TNO developed the Simplified Interaction Tool (SIT) for underwater shock analysis. The SIT is a module of user routines linked to LS-DYNA, which generates the UNDEX loading on the wet hull of a 3D finite element model of the ship structure by means of sophisticated physical approximation. This eliminates the need for a 3D mesh of the surrounding water, such as necessary for advanced coupled finite element/hydrocode simulations. The SIT models both the shock wave stage with reflections and cavitation and the subsequent gas bubble loading. The SIT was tuned and validated using experimental data from full-scale ship shock trials. A typical simulation of a detailed 3D finite element model of a naval ship takes only hours for the shock wave stage, against at least days for a comparable coupled simulation. This presentation provides a short overview of the physical approximations of the SIT, recent enhancements and examples of applications.
Building Engineering & Civil Engineering
To reference this document use:
SD - Structural Dynamics
TS - Technical Sciences
High Tech Maritime and Offshore Systems
2014 Navy Ship Technology Seminar, Daejeon, Republic of Korea, 1-10