Fluids and Structures

Publications

Damping Modeling Strategy for Naval Ship System

This report explores various damping modeling strategies crucial for naval ship structural design, addressing shock, vibration, and noise. It emphasizes the equivalent modal damping method for structural dynamic analysis and a methodology for estimating structural and material damping using single element models and experimental data, making it applicable to complex naval ship systems.

Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure

Keith G. Webster

This thesis investigates the effects of close proximity underwater explosions on ship-like structures using experimental finite element model tests and the Multi-Material Arbitrary Lagrangian/Eulerian method. It examines the propagation of pressure waves through fluid and their transmission to structures, while also highlighting the limitations of current methodologies in predicting long-term explosion effects.

Simulating Solid Propellant Rockets at CSAR

M. Heath, R. Fiedler,and W. Dick

This paper details the Center for Simulation of Advanced Rockets' (CSAR) efforts in computationally simulating solid propellant rockets, specifically the NASA Space Shuttle's solid rocket boosters. It covers the development of integrated simulation codes, including fluid dynamics (ROCFLO) and structural analysis (ROCSOLID), to model complex phenomena from normal operation to potential failure scenarios. The research aims to advance whole-system simulation from first principles.

Parametric Studies of DDG-81 Ship Shock Trial Simulations

Jarema M. Didoszak

This thesis investigates the dynamic response of the DDG-81 destroyer to underwater explosions using detailed finite element simulations in LS-DYNA. It parametrically varies charge size, standoff distance, and location to demonstrate the utility of finite element methods in predicting complex structural responses to such events.

Dynamic Response of a Catamaran-Hull Ship Subjected to Underwater Explosions

Hakan Ucar

This thesis investigates the dynamic response of thin-hulled catamaran ships to underwater explosions using finite element analysis and fluid-structure interaction (FSI) with ABAQUS/Explicit. It models various explosion conditions to determine structural deformations based on charge weight and standoff distance, providing valuable data for survivability studies of current and future catamaran hull ship designs.