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AN ABSTRACT OF THE DISSERTATION OF Ehsan Shams Sobhani for the degree of Doctor of Philosophy in
 

Summary:  AN ABSTRACT OF THE DISSERTATION OF
Ehsan Shams Sobhani for the degree of Doctor of Philosophy in
Mechanical Engineering presented on November 13, 2009.
Title: Numerical Simulation of Cavitating Bubble-Laden Turbulent Flows
Abstract approved:
Sourabh V. Apte
Many engineering devices and propulsion systems suffer from undesirable effects of
cavitation; such as degradation in the efficiency of pumps and turbines, generation of
noise and vibration on ship propeller, increased drag and erosion of propeller blade,
etc. In spite of decades of research on this problem, detailed study of cavitation
physics is still a technical challenge for the current experimental and numerical
approaches. Further development of robust and accurate numerical methods for
cavitating flow simulation, is the basis of this research.
The main objective of this research is to investigate traveling bubble cavitation in
turbulent flows. Variable density Navier-Stokes equations are solved in an
unstructured grid finite volume solver. Large Eddy Simulation technique with
dynamic Smagorinsky subgrid model is used for turbulence modeling. Bubble
cavitation is modeled in a Lagrangian framework with subgrid models for forces
acting on bubbles. Bubble size variation is modeled using local flow field
hydrodynamic pressure for solving Rayliegh-Plesset equation. An adaptive time

  

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

 

Collections: Engineering