Graduate Thesis Or Dissertation
 

Hydrodynamic contact/impact modeling and application to ocean engineering problems

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  • Fluid-structure interaction (FSI) is a very interesting and challenging multi-disciplinary field involving interaction of a movable or deformable structure with an internal or surrounding fluid flow. FSI has several practical engineering applications such as the determination of the hydrodynamic forces on a structure or the dynamics of motion of bodies on the water-free surface. A requirement for the solution of these class of contact and impact FSI problems need accurate model development and predictive assessment especially when complex structures are involved. Analysis of FSI problems is often difficult and therefore experimental investigations (or empirical laws) are performed by conducting experiments in a physical wave basin. These experiments though impendent with the real world scenario often are time-consuming and expensive. Importantly, it may not be economically viable to conduct parametric studies using experiments. Alternatively, numerical models when developed with similar capabilities will complement the experiments very well because of the lower costs and the ability to study phenomena that are not completely feasible in a physical laboratory. This dissertation systematically examines the contact and impact fluid-structure interaction numerical modeling procedure applied to various practical multi-physics ocean engineering problems. The significant component of contact and impact FSI problems addressed in this research is divided into three categories. First, the experimental and numerical investigations for a rigid-body contact and impact (drop tests) is presented, and followed by numerical simulation and analysis of low and high-filled multi-physics sloshing phenomena in the LNG tank including air compressibility effect. Second, the performance of a finite-element method and a smoothed particle hydrodynamic method is evaluated by using a consistent numerical platform for the simulation of contact and impact of a fluid interacting with a flexible body. Finally, numerical simulation and analysis of a complex-body contact and impact (a fully pressurized surface effect ship (SES) bow finger seal motions) is investigated.
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