Numerical Simulation of Cavitation in Rigid Body Motion in Unsteady State

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Asnaghi, Abolfazl | 2006

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39035 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Seif, Mohammad Saeed
Abstract:
In this thesis, cavitating flow over 2D/3D geometries of cavitators and projectile bodies in stationary and moving conditions are simulated using the "Volume of Fluid" (VOF) technique. The main application of VOF model is for simulating free surface flows. In this work, another capability is added to the VOF algorithm to solve for gas phase and by applying analytical-numerical mass transfer models, cavitation phenomenon is simulated. The developed algorithm precisely simulates the geometrical parameters of supercavities such as dimension and shape in a wide range of cavitation numbers. In addition, the flow parameters of supercavity such as drag coefficient, pressure coefficient inside the cavity and at the unsteady stagnation point outside the cavity, and reentrant jet are simulated with high accuracy. After a small region of reverse flow, velocity profile inside the cavity exhibits semi-linear behaviour similar to that of the laminar boundary layer. The current algorithm can also be used to simulate the characteristics of cloud cavitation such as separation of large vapor structures. The results obtained in this study are in good agreement with experimental data and analytical theories
Keywords:
Simulation ; Numerical Simulation ; Transition State ; Cavitation ; Moving Body

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