Alexandra H Techet

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This thesis investigates the hydrodynamic effects of biologically-inspired leading-edge tubercles. Two complementary studies examine the performance of three-dimensional hydrofoils based on the pectoral flippers of the Humpback Whale (novangilae megaptera). The first study uses a static foil, with application to conventional control surfaces– such as(More)
On May 31, 2010, a direct acoustic measurement method was used to quantify fluid leakage rate from the Deepwater Horizon Macondo well prior to removal of its broken riser. This method utilized an acoustic imaging sonar and acoustic Doppler sonar operating onboard a remotely operated vehicle for noncontact measurement of flow cross-section and velocity from(More)
Abstract— The incorporation of novel structures and mechanisms from nature into the design and function of machines is being attempted through biomimetics. The goal of biomimetics in the field of robotics is to use biological inspiration to engineer machines that emulate the performance of animals, particularly in instances where the animal’s performance(More)
OpenProp is an open-source computational tool for the design and analysis of optimized propellers and turbines. The numerical model is based on the vortex lattice lifting line methods utilized by the US Navy as well as commercial designers. The code is written in MATLAB M-code, which is widely used in academia and industry. The code includes analysis(More)
Propulsion and maneuvering underwater by flapping foil motion, optimized through years of evolution, is ubiquitous in nature, yet marine propulsors inspired by examples of highly maneuverable marine life or aquatic birds are not widely implemented in engineering. Performance data from flapping foils, moving in a rolling and pitching motion, are presented at(More)
Jeffrey M. Aristoff, Tadd T. Truscott, Alexandra H. Techet, and John W. M. Bush Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA Naval Undersea Warfare Center, Newport, Rhode Island 02841, USA Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We present a study of the forces during free-surface water entry of spheres(More)
The impacts of solid spheres with the free surface have been studied for over one hundred years. In this thesis, the Worthington jets resulting from the impacts of hydrophobic and hydrophilic spheres with the free surface are studied experimentally. Several impact velocities and three materials of differing mass ratios are used. The resulting jets are(More)