An Adaptive Immersed Boundary Method for CFD Simulation of Multiphase Flows with Moving Internal Bodies
Open Access
Author:
McIntyre, Sean Michael
Graduate Program:
Aerospace Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
January 07, 2011
Committee Members:
Robert Francis Kunz, Thesis Advisor/Co-Advisor Robert Francis Kunz, Thesis Advisor/Co-Advisor Jules Washington Lindau V, Thesis Advisor/Co-Advisor
Keywords:
Multiphase Flow Immersed Boundary Method Water Entry Simulation
Abstract:
With the aim of improving the efficiency of underwater launch simulation, a new direct-forcing
based immersed boundary method has been developed for incompressible multiphase
flow. Equations for six degree-of-freedom rigid body dynamics based on integration
of the force distribution due to the immersed boundary are developed and verified.
Octree-based adaptive mesh refinement is incorporated to ensure adequate resolution
of flow features such as wakes and stagnation regions, as well as free surfaces and the
region occupied by the immersed body. The derived immersed boundary approach for
multiphase flow with six degree-of-freedom dynamics and adaptive mesh refinement is
verified and validated through a series of simulations and comparison with analytic solutions
and experimental data for stagnation point flow, free-fall of spheres in viscous
flow, water impact of wedges, and water entry of steel spheres. The results are shown to
be in good agreement with available data. Limitations of the method are also identified,
along with proposed improvements.
