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AN ABSTRACT OF THE THESIS OF Justin Richard Finn for the degree of Master of Science in
 

Summary:  AN ABSTRACT OF THE THESIS OF
Justin Richard Finn for the degree of Master of Science in
Mechanical Engineering presented on June 19, 2009.
Title: A Multiscale Modeling Approach for Bubble-vortex
Interactions in Hydro-propulsion Systems
Abstract approved:
Sourabh V. Apte
Multiphase flow dynamics are important in many naval and turbomachinery
applications, where bubble interaction with low pressure, vortical structures can
lead to undesirable cavitation and accoustic effects. To better understand the
underlying phenomena, a multiscale numerical framework is developed to
simulate bubble laden flow in dynamic hydro-propulsion systems. Several
subproblems in the pre-cavitation regime are identified and simulated, with a
particular emphasis on bubble-vortex interactions. Two simulation techniques are
used throughout. First, a Hybrid Lagrangian Eulerian (HLE) method, based on
fictitious domain techniques is applied to both forced and free motion of
arbitrarily shaped rigid bodies (i.e. propellers, hydrofoils & bubbles). This
technique uses cartesian, body non-conformal grids to capture rigid body motion
interactions with the fluid phase without grid regeneration. Next, a Discrete
Element Model (DEM) is applied to flows where the bubbly phase is not resolved

  

Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University

 

Collections: Engineering