MS Plan A Defense: Fluid-Structure Interaction Analysis of an Oscillating Wave Surge Energy Converter using LS-Dyna

Kyle Pappas Master’s Student Department of Ocean and Resources Engineering University of Hawai’i at Mānoa **This defense will be held both in person (POST 723) and over Zoom** Meeting ID: 936 1681 5822 Passcode: KyleMS https://hawaii.zoom.us/j/93616815822 Three-Dimensional two-way coupled fluid structure interaction (FSI) analysis requires a complex strategy utilizing the finite element method (FEM) for large matrix computations. Two FEM solvers in LS Dyna are utilized to conduct a structural analysis of the Hawai’i Wave Surge Energy Converter (HAWSEC) for a particular wave condition case study that is directly compared with experimental results. The HAWSEC is a hollow, surface piercing,

Seminar: Fundamentals of Collision and Constraint Dynamics: Review and Potential Applications in Ocean Engineering

Albert S. Kim Professor and Graduate Chair Department of Civil and Environmental Engineering University of Hawai’i at Mānoa   Hydrodynamic impacts and interactions between fluid flow and solid objects–both moving and stationary–are of great importance in various engineering disciplines from nano- to ocean-scale phenomena. These processes include aggregate/aggregation dynamics of sub-micron particles (as point masses), granular dynamics (as inelastic bodies of finite volumes) for pharmaceutical manufacturing processes and sediment transport in ocean engineering, and classical dynamics of rigid bodies as big as vehicles and shipping containers. Although the collision and constraint dynamics applications have vast length-scale ranges, the principles and

Seminar: Understanding the Fundamentals of Vortex-induced Vibrations: Research Past, Present and Future

Deniz Gedikli, PhD Assistant Professor Ocean and Resources Engineering Department, University of Hawaii at Manoa The canonical problem of fluid flow across an elastically mounted circular cylinder has been a widely studied problem in fluid mechanics due to the ubiquitous nature of the simple geometry in engineering applications and the resulting complexity of the fluid-structure interaction. In many engineering design and operation applications, it is advantageous to be able to predict fluid-structure interactions such as self-limiting vortex-induced vibrations, since these vibrations can strongly affect fatigue life or operational downtime in a variety of systems (e.g. motion of offshore structures, vibration

Seminar: Fluid-Structure Interactions: From Fundamentals of Flow-induced Vibration to Applications in Energy Harvesting

Banafsheh Seyed-Aghazadeh, PhD Mechanical Engineering Department, University of Massachusetts, Dartmouth When a flexible or flexibly-mounted structure is placed in fluid flow, it can deform or oscillate. The deformation or oscillation of the structure will result in the change of flow forces, which in turn will result in the change of the structure’s deformation or oscillation. This is called a Fluid-Structure Interactions (FSI) problem and the oscillation is called Flow-Induced Vibration (FIV). FIV has significant implications for a number of physical systems, from aeolian harps to power transmission lines, towing cables, undersea pipelines, drilling risers and mooring lines used to stabilize

Seminar: Fluid-Structure Interactions in Offshore Engineering

Deniz Gedikli, PhD Assistant Professor Department of Ocean and Resources Engineering University of Hawai’i, Mānoa Technology, law and world’s appetite for more energy pushed oil-gas and renewable energy source exploration farther from the shores. Recent developments in this search have brought additional design challenges since these large offshore structures are more prone to the harsh environments around them. These factors require innovative approaches, in part because companies cannot operate in conventional ways in the Arctic region and in deep sea. This topic has critical importance to the offshore industry, particularly for the cost-effective development of new ocean structures such as

MS Plan B Defense: Hydroelasticity of the Inflatable Assault Craft during slamming events

Bradley Beeksma Advanced inflatable structures are an emerging technology in the marine environment. Their growth stems from a demand by the U.S. Navy for rapidly deployable structures such as inflatable boats, inflatable bridges, and launch and recover systems. This novel technology requires considering the interactions between hydrodynamic forces and structural behavior, a study commonly known as fluid–structure interaction (FSI). The ability of numerical tools to model FSI characteristics of inflatables is severely underdeveloped in relevant industries. The present work is an evaluation of an existing, research FSI solver to model an advanced inflatable technology known as drop-stitch fabric. As a