Abstract: Instantaneous derivatives of high-precision experimental data can be evaluated by fitting the data with a smoothing spline. This paper presents a novel and robust method for choosing the best spline fit and, hence, the best prediction of the derivatives. Typically, a smoothing spline is fit by choosing the value of a smoothing parameter that [...]
Abstract: The water-entry of ballistic projectiles is investigated using high-speed digital imaging to capture the subsurface cavity dynamics. Specially designed 0.22 caliber projectiles are fired into water at shallow angles to the free surface (5º to 15º) at Mach numbers between 0.3 and 1.0. Redesigned projectile tip geometries allowed projectiles to successfully enter the [...]
Citation: Truscott, T. T., Belden, J. & Techet, A. H., Three dimensional flow field PIV and biological sensing using synthetic aperture, Proceedings of the 16th International Symposium on Unmanned Untethered Submersible Technology (UUST09), Durham, New Hampshire, August 23-26, 2009.
Citation: Belden, J., Truscott, T. T., & Techet, A. H., "Three dimensional flow fields using synthetic aperture PIV." 8th International Symposium on Particle Image Velocimetry, Melbourne, Australia, August 25-28, 2009.
Abstract: Ocean science and engineering are exciting and active fields industry as well as academia. “Revolutionizing” marine science and technology requires that future generations have access to strong academic programs in ocean science and engineering. Undergraduates pursing degree programs in ocean engineering at the Massachusetts Institute of Technology (MIT) are introduced to a wide [...]
Abstract: When a hard-boiled egg spins through a pool of milk on the kitchen counter, the milk rises up the sides of the egg and droplets are ejected. This phenomenon occurs when any partially submerged object whose radius increases upward from the fluid surface (e.g., spheres, inverted cones, and rings) spins in [...]
Abstract: A highly deformable elastic sphere may bounce poorly on land, but it will skip spectacularly on water. Citation and Link: Truscott, T.T., Belden, J. & Hurd, R., “Water-skipping stones and spheres.” Physics Today, 67, 12, 70, DOI: 10.1063/PT.3.2631, December 2014.
Abstract: We present the results of 3D velocity mea- surements of the flow fields around a free-flying painted lady butterfly (Vanessa cardui) and a tethered mechanical flapper using Synthetic Aperture PIV (SAPIV). The velocity fields presented for the free-flying butterfly have limited spatial resolution; however, leading edge vortices (LEV) and trailing edge [...]
Abstract: Not available. Citation and Link: Daily, J., Pendlebury, J., Langley, K., Hurd, R., Thomson, S. & Truscott, T., “Catastrophic cracking courtesy of quiescent cavitation”, Physics of Fluids, 26, 091107, DOI: 10.1063/1.4894073, September 2014.
Abstract: We present a study of the forces, velocities, and trajectories of slender (length/diameter = 10) axisymmetric projectiles using an embedded inertial measurement unit (IMU). Three nose shapes (cone, ogive, and flat) were used. Projectiles were tested at vertical and oblique impact angles with different surface treatments. The trajectory of a half-hydrophobic [...]