Fully resolved simulations for fluids, structures, and their interactions
TITLE:
Fully resolved simulations for fluids, structures, and their interactions
DATE:
Friday, August 31st, 2018
TIME:
3:30 PM
LOCATION:
GMCS-314
SPEAKER:
Amneet Bhalla, Ph.D., Assistant Professor, Department of Mechanical Engineering, San Diego State University.
ABSTRACT:
Fluid-structure interaction (FSI) problems are ubiquitous in engineering and biological/medical fields. Efficient modeling of
FSI problems not only helps to visualize flow fields, but also improves the device design by experimenting with virtual geometries
created on a computer. In this talk, I will present an efficient computational framework utilizing the immersed boundary (IB) technology
for modeling FSI problems for a range of applications. First, I will introduce the IB methodology to resolve FSI problems. Later, I will
focus on FSI applications in the areas of aquatic locomotion, and multiphase flows. For aquatic locomotion, I will answer two fundamental
fluid mechanics questions. The first question pertains to splitting of hydrodynamic forces into drag and thrust for an undulatory swimmer.
Undulatory swimmers do not have demarcated drag and thrust producing spatial regions, unlike an airplane’s fuselage (drag) and
propellers (thrust). Using fully resolved simulations, I will show that it is still possible to split drag and thrust for undulatory swimmers
even at high Reynolds number. The second question pertains to the convergent evolution of optimal specific wavelength of elongated fins
observed in various vertebrates and invertebrates. These species diverged on the tree-of-life millions of years ago. Using simulations, we
find that the observed specific deformation pattern of the fins is thrust maximizing, thereby increasing their chance of survival.
For multiphase flows, I will present results on a coupled level set and IB method to simulate three phase (solid, gas, and liquid)
flows using a strongly coupled velocity-pressure flow solver. Finally, I will present applications of this novel multiphase solver
in modeling wave energy converters and windmill simulations.
HOST:
Dr. Parag Katira
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