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Dissertation
Simulation of Slamming on a Fiber Reinforced Composite Structure Using the ALE/Eulerian Numerical Approach
Authors: ---
Year: 2019 Publisher: Liège Université de Liège (ULiège)

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Abstract

Slamming impact on marine structures constitutes a major concern for designers. Characterized
by severe impulsive loads with short duration, this highly non-linear fluid-structure
interaction can lead to significant structural damage. Several analytical models have been
developed to predict the loads generated on slamming events. However, existent models
are still not sufficiently accurate to be applied on industrial level.
This thesis presents a numerical slamming model developed with the ALE/Eulerian
approach on LS-DYNA. Primarily, the classical two-dimensional rigid wedge is used for an
overview on the functioning of the applied penalty contact algorithm and calibration of
its governing parameters. The model is validated through comparison with experimental
results of the vertical slamming force available on the literature. Sensitivity analyses on
parameters such as the penalty factor, damping coefficient and number of coupling points
are performed. Additionally, simulations with a three-dimensional version of the rigid
wedge are presented with the objective of demonstrating the influence of 3D flow effects
on the resulting force. The models produce satisfactory results, reproducing fairly well the
slamming force and the free-surface behavior on the rigid structure.
On a third stage, the model is applied to an elasto-plastic flat plate. Good agreement
with experimental results is found for the hydro-elastic behavior of the plate. Accurate
measurements of the local pressure, however, could not be obtained.
The model is finally extended to a practical application proposed by the company Calcul-
Méca, a fiber reinforced composite sonar dome subjected to slamming. As a preliminary
approach, a two-dimensional model with an approximated parabolic rigid body is developed.
However, results obtained are not conclusive. Severe leakage occurs on the Lagrangian
structure and could not be properly fixed. The slamming force seems to be incoherent
with the expected physical behavior. These issues are probably associated to the low
deadrise angle of the parabola combined with the high imposed constant velocity, which
create extreme conditions for the penalty contact algorithm.


Book
More is different : fifty years of condensed matter physics
Authors: ---
ISBN: 0691219532 Year: 2001 Publisher: Princeton, New Jersey : Princeton University Press,

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Abstract

This book presents articles written by leading experts surveying several major subfields in Condensed Matter Physics and related sciences. The articles are based on invited talks presented at a recent conference honoring Nobel laureate Philip W. Anderson of Princeton University, who coined the phrase "More is different" while formulating his contention that all fields of physics, indeed all of science, involve equally fundamental insights. The articles introduce and survey current research in areas that have been close to Anderson's interests. Together, they illustrate both the deep impact that Anderson has had in this multifaceted field during the past half century and the progress spawned by his insights. The contributors cover numerous topics under the umbrellas of superconductivity, superfluidity, magnetism, electron localization, strongly interacting electronic systems, heavy fermions, and disorder and frustration in glass and spin-glass systems. They also describe interdisciplinary areas such as the science of olfaction and color vision, the screening of macroions in electrolytes, scaling and renormalization in cosmology, forest fires and the spread of measles, and the investigation of "NP-complete" problems in computer science. The articles are authored by Philip W. Anderson, Per Bak and Kan Chen, G. Baskaran, Juan Carlos Campuzano, Paul Chaikin, John Hopfield, Bernhard Keimer, Scott Kirkpatrick and Bart Selman, Gabriel Kotliar, Patrick Lee, Yoshiteru Maeno, Marc Mezard, Douglas Osheroff et al., H. R. Ott, L. Pietronero et al., T. V. Ramakrishnan, A. Ramirez, Myriam Sarachik, T. Senthil and Matthew P. A. Fisher, B. I. Shklovskii et al., and F. Steglich et al.

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