Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session E05: Surface Waves II |
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Chair: Christine Ikeda-Gilbert, Virginia Polytechnic Institute Room: Georgia World Congress Center B207 |
Sunday, November 18, 2018 5:10PM - 5:23PM |
E05.00001: Axisymmetric cavity collapse in parametrically forced gravity waves at varying liquid depth D Krishna Raja, Shyama Prasad Das Experiments are carried out in a circular cylinder (2R=10cm) for: deep, intermediate and shallow conditions to compare the jetting behavior. The presence of bottom wall increases the dissipation that dampens the disturbances. In the breaking regime, cavity formed by the large amplitude wave results in intense jet from free surface demonstrated by previous researchers in deep water. A critical fluid depth is identified in intermediate depth up to which the collapse exhibits similar behavior. Beyond this depth the cavity aspect ratio (depth to radius) and implosion is strongly affected by the bottom wall, resulting in reduced jet velocity. A power law dependence of radial length scale of the cavity with time remaining for collapse has been observed. Power law exponent at initial stage is found to be ½, which crosses over to 1 in the later stages indicating an inertial-viscous crossover. At intermediate depth, when the cavity touches the bottom wall such a transition is not well identified. At very shallow depth, eventually very small aspect ratio, leads to multiple transition like viscous-inertia-viscous to approach the collapse that is similar to a pinch-off of liquid bridges in highly viscous medium. With available resolution a viscous-inertial transition is captured. |
Sunday, November 18, 2018 5:23PM - 5:36PM |
E05.00002: Exploring the Factors which Influence Large Vessel-Generated Waves in a Tidal River Alexandra Muscalus, Kevin A. Haas Large shipping vessels generate highly energetic wake that can contribute significance amounts of energy to the hydrodynamics of a river. A hydrodynamic characterization in the Savannah River, Georgia, indicates that shipping channel traffic between the open ocean and the Port of Savannah is a likely contributor to erosion threatening environmental and cultural resources along the channel. To better understand the mechanisms underlying the erosion, a field study has been conducted to collect water level and velocity data in the channel; approximately 350 wake events are well-captured in this data set. These data are used to characterize persistent patterns in the energy flux and characteristics of ship wake near the shore. The measured wake events are paired with relevant ship data, including ship velocity, length, heading, and draft at the time of wake measurement; they are also paired with numerical model data of the region such that the impacts of tidal current in the shipping channel can be examined. The pairing of ship characteristics, river conditions, and measured wake data provide insight into the factors affecting the total energy and characteristics of large vessel-generated waves. |
Sunday, November 18, 2018 5:36PM - 5:49PM |
E05.00003: Laboratory scale fluid quantization, De Broglie quantum mechanics and new solutions to 3D-classical wave equation Hector A Munera Quantum phenomena in fluids at lab scale recently discovered [1], confirmed [2] and interpreted as hydrodynamic pilot waves [3], revived De Broglie quantum mechanics, based on non-linear classical wave equation CWE [4]. This paper is the first complete English overview of our novel nonharmonic solutions to CWE [5, 6], recently integrated into a unified fluid and field (UFF) theory of nature [7-9]. References: 1) Couder Y and Fort E (2006) Phys. Rev. Lett. 97 154101. 2) Harris D M and Bush J W M (2013) Phys. Fluids 25 091112. 3) Bush J W M (2015) Annual Review of Fluid Mechanics 47 269-292. 4) De Broglie L (1962) Cahiers de Physique 16 (147) 425-445. 5) Munera H A and Guzman O (1997) Found. Phys. Lett. 10 (1) 31-41. 6) Munera H A (2000) Momento 20 1-30. 7) Munera H A (2016) Interconnection of all forces of nature via the energy and momentum equations for a fluid aether Unified Field Mechanics Ed R L Amoroso et al (Singapore: World Scientific) 247-267. 8) Munera H A (2016) Unified field theory from classical wave equation: application to atomic and nuclear structure AIP Conference Proc. 1753 030015. doi: 10.1063/1.4955356. 9) Munera H A (2018) General relativity as a unified fluid and field theory IOP J. Phys.: Conf. Ser. 1051 012024. |
Sunday, November 18, 2018 5:49PM - 6:02PM |
E05.00004: Longitudinal Compression Loads on a Slender Cylinder in Air and Water Alka Panda, Ryan Fisher, Matthew Werner, Colin Russell, Christine Ikeda-Gilbert Shockwave propagation and the resulting stress wave through axons located in the brain can cause traumatic brain injury. An experimental study was conducted using scaled-up cylinders under a longitudinal impact load in both air and water. The material properties of the axons are modelled by both ballistic gelatin and PDMS molded into slender cylinders. Each cylinder is given an impulse to simulate an arriving shockwave and filmed with a high-speed camera at 14,000 frames per second to capture the soft material deformation. An in-house image-processing code was written in Matlab to measure the profiles of the cylinder’s top and bottom surface waves and to track the displacement of embedded bubbles/particles to understand the internal strain field. Preliminary experiments in air using blunt force impacts suggest that the surface deformation follows a sinusoidal pattern with time dependent amplitude and frequency as does the internal longitudinal and transverse strain fields. These results from experiments performed in air are expected to hold but decrease in amplitude and frequency when performed in water due to damping effects. |
Sunday, November 18, 2018 6:02PM - 6:15PM |
E05.00005: Turbulent windprint on a liquid surface Stephane Perrard, Adrian Lozano-Duran, Marc Rabaud, Michael Benzaquen, Frédéric Moisy When a turbulent wind blows on a liquid surface it generates surface waves that are amplified above a critical speed. Below the threshold, the wind is still turbulent and generate little surface perturbation called wrinkles. These deformations can be seen as a base state of the liquid surface response, on top of which surface waves may grow. We will present an unified theory of the wrinkle regime as the viscous response of a liquid to a turbulent wind. We will combine analytical computations, DNS model of a turbulent boundary layer and comparison with existing experimental data to provide a quantitative description of such a turbulent windprint on a liquid surface. |
Sunday, November 18, 2018 6:15PM - 6:28PM |
E05.00006: Urine sample splash back Josh R Wille, Faith Leibman, Nathan B Speirs, Tadd T Truscott Urinating into a cup is undesirable. Perhaps it is because the reasons for performing this task have negative connotations (e.g., illness, employment requirements, etc.) and the physical action often results in a mess. It is even more problematic for those who are disabled and female. In an effort to improve our understanding of the problem we have designed an experiment where a jet of water simulates the urine stream and a tissue-like polymer simulates the interaction with nearby skin tissue. We explore several configurations to cover as many possible differences in anatomy. Cups placed downstream illuminate the splash-back problem during urine capture. We identify several regimes and propose solutions to mitigate the awkward, unsanitary and annoying urine sample dilemma. |
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