Date of Award

2018

Degree Type

Thesis

Degree Name

Master of Science in Ocean Engineering

Department

Ocean Engineering

First Advisor

Jason Dahl

Abstract

The existence of a wall near a foil body in a freestream influences the hydro-dynamic forces exerted on the body. In this research, numerical simulations are performed to investigate the hydrodynamics of a NACA 0012 foil with wall effects using open source software, a 2-D Navier-Stokes solver based on the Boundary Data Immersion Method (BDIM). The inherent difference between the 2-D and 3-D dynamic wall effects is shown by comparing experimentally obtained measurements of vortex shedding behind a flapping foil with a numerical simulation using the same kinematics. The differences are significant in terms of the thrust force coefficient profiles and the vortex development. Particle image velocimetry (PIV), using data from an experiment, shows that the vortex at the tip significantly influences the formation and phasing of the wake.

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