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CFD Modeling of Hydraulic Energy Harvesting Systems and Unmanned Aerial Systems

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Thursday, October 31, 2019 4 pm

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ME-EM Graduate Seminar Speaker Series

proudly presents:

I-Han Liu, PhD

Argonne National Laboratory

Abstract: Wake-boundary layer flow interactions are encountered in many fields of engineering applications. In turbulent flow conditions, these fluid-structure interactions usually lead to large changes in the flow patterns and consequently alter the hydrodynamic loading on the structure. The flow-induced vibrations represent a source of uncertainties regarding the safety and endurance of hydraulic structures. To optimize the structure design, hence, requires a good understanding of complex phenomena such as flow separation, wake instabilities, and unsteady vortex shedding formation in the vicinity of the surfaces. Numerical simulations are conducted for complex flows past translating and rotating objects near free and rigid surfaces. Arrays of translating blades, pump turbines, Francis turbine and hydrokinetic turbines are considered. Large Eddy Simulations (LES) in three dimensional flow geometry are performed. Both Eulerian and Lagrangian methods are used to characterize turbulent flow structure in the wake. Unmanned Aerial Systems (UAS) has been applied in both commercial and defense fields to accomplish various operational tasks. Aerodynamics plays a significant role in the design process since the aircraft’s performance is depend on the force acting on the body, in which results from the interactions between air and the aircraft. Three-dimensional simulations using RANS RNG k-ε turbulence model are conducted at Reynold number of 1×106 for a remotely piloted vehicle (RPV), the Pioneer. Results are validated by wind-tunnel experiments, which demonstrated that the computationally efficient and accurate CFD simulations performed is able to obtain the aerodynamic coefficients that can be delivered to the dynamic simulation tool for aircraft dynamic analysis.

Bio: Dr. I-Han Liu is currently a postdoctoral researcher at Argonne National Laboratory located in Lemont, IL. Her research involves characterizing aerodynamics of Unmanned Aerial Systems (UASs) using computational fluid dynamics (CFD) tools. She received her PhD in Mechanical Engineering from Lehigh University in 2018. Her graduate work focused on CFD simulations for characterizing hydrodynamic flow structures that can help in design and optimize hydraulic energy harvesting systems. Before joining Lehigh University, she worked at Electric Motor Technology Research Center as a research assistant in Taiwan in 2011. She earned her BS and MS in mechanical engineering from National Cheng Kung University in 2008 and 2010. Her master thesis focused on motion control, dealing with contour error problems for machine tools.

Invited by: Seong-Young Lee

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  • Cheyenne Scott

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