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Journal articles on the topic 'Towed foils'

Author: Grafiati

Published: 6 September 2023

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1

Roman, Chris, and Dave Hebert. "Concept Tests for a New Wire Flying Vehicle Designed to Achieve High Horizontal Resolution Profiling in Deep Water." Journal of Atmospheric and Oceanic Technology 28, no. 12 (2011): 1657–71. http://dx.doi.org/10.1175/jtech-d-10-05040.1.

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Abstract Efficiently profiling the water column to achieve both high vertical and horizontal resolution from a moving vessel in deep water is difficult. Current solutions, such as CTD tow-yos, moving vessel profilers, and undulating tow bodies, are limited by ship speed or water depth. As a consequence, it is difficult to obtain oceanographic sections with sufficient resolution to identify many relevant scales over the deeper sections of the water column. This paper presents a new concept for a profiling vehicle that slides up and down a towed wire in a controlled manner using the lift created

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2

Deng, Rui, Shigang Wang, Wanzhen Luo, and Tiecheng Wu. "Experimental Study on the Influence of Bulbous Bow Form on the Velocity Field around the Bow of a Trimaran Using Towed Underwater 2D-3C SPIV." Journal of Marine Science and Engineering 9, no. 8 (2021): 905. http://dx.doi.org/10.3390/jmse9080905.

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In this study, particle image velocimetry was applied to measure the flow field around the bow region of a trimaran with different appendages. The dimensionless axial velocity u/U in test planes 1 and 2 of the testing model was measured by using a towed underwater stereoscopic particle image velocimetry (SPIV) system. Based on the measured flow field data, the local sinkage values in test planes 1 and 2 of the testing model with different appendages at speeds of 1.766 and 2.943 m/s were presented. In addition, the effects of speed, bulbous bow type, T foils, and bow wave on the axial velocity

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3

Steele, S. C., J. M. Dahl, G. D. Weymouth, and M. S. Triantafyllou. "Shape of retracting foils that model morphing bodies controls shed energy and wake structure." Journal of Fluid Mechanics 805 (September 20, 2016): 355–83. http://dx.doi.org/10.1017/jfm.2016.553.

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The flow mechanisms of shape-changing moving bodies are investigated through the simple model of a foil that is rapidly retracted over a spanwise distance as it is towed at constant angle of attack. It is shown experimentally and through simulation that by altering the shape of the tip of the retracting foil, different shape-changing conditions may be reproduced, corresponding to: (i) a vanishing body, (ii) a deflating body and (iii) a melting body. A sharp-edge, ‘vanishing-like’ foil manifests strong energy release to the fluid; however, it is accompanied by an additional release of energy, r

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4

Kerdraon, Paul, Boris Horel, Patrick Bot, Adrien Letourneur, and David David Le Touzé. "High Froude Number Experimental Investigation of the 2 DOF Behavior of a Multihull Float in Head Waves." Journal of Sailing Technology 6, no. 01 (2021): 1–20. http://dx.doi.org/10.5957/jst/2021.6.1.1.

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Dynamic Velocity Prediction Programs are taking an increasingly prominent role in high performance yacht design, as they allow to deal with seakeeping abilities and stability issues. Their validation is however often neglected for lack of time and data. This paper presents an experimental campaign carried out in the towing tank of the Ecole Centrale de Nantes, France, to validate the hull modeling in use in a previously presented Dynamic Velocity Prediction Program. Even though with foils, hulls are less frequently immersed, a reliable hull modeling is necessary to properly simulate the critic

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5

Wibawa, M. S., S. C. Steele, J. M. Dahl, D. E. Rival, G. D. Weymouth, and M. S. Triantafyllou. "Global vorticity shedding for a vanishing wing." Journal of Fluid Mechanics 695 (February 13, 2012): 112–34. http://dx.doi.org/10.1017/jfm.2011.565.

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AbstractIf a moving body were made to vanish within a fluid, its boundary-layer vorticity would be released into the fluid at all locations simultaneously, a phenomenon we call global vorticity shedding. We approximate this process by studying the related problem of rapid vorticity transfer from the boundary layer of a body undergoing a quick change of cross-sectional and surface area. A surface-piercing foil is first towed through water at constant speed, $U$, and constant angle of attack, then rapidly pulled out of the fluid in the spanwise direction. Viewed within a fixed plane perpendicula

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6

Solař, Jaroslav. "Sizing the Thickness of the Coated Insulation against Methane Leakage Coming out of Bedrock." Applied Mechanics and Materials 501-504 (January 2014): 2327–30. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.2327.

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On the surface of the Earth, methan is usually located in undermined areas, especially in places where the mining was stopped already. The protection of buildings from methan coming out of bedrock can be provided by layer isolation made of suitable type of polymer foil. The entry deals with the matter of designing the isolation against penetrating methan coming out of bedrock into surface line buildings (e.g. shaft, reservoir, water tower etc.).

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7

McCormick, Michael E., and Luca Caracoglia. "Hydroelastic Instability of Low Aspect Ratio Control Surfaces." Journal of Offshore Mechanics and Arctic Engineering 126, no. 1 (2004): 84–89. http://dx.doi.org/10.1115/1.1643084.

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As the operational speeds of surface ships and submarines increase, so does the probability that unwanted vibrations caused by the hydroelastic instability (flutter) of the special class of hydrofoils called control surfaces. These include rudders and diving planes. By nature, these are thick symmetric hydrofoils having low aspect ratios. The 3-D tip effects become more pronounced as the aspect ratio decreases. In the present study, the added-mass and circulation terms of the 2-D flutter equations are modified to include three-dimensional effects. The modifications are performed by introducing

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8

Glauberman, M., A. Doroshenko, K. Shestopalov, K. Liudnytskyi, K. Zhuk, and A. Tsapushel. "Solar desiccant-evaporative cooling systems with ceramic packing (microporous multichannel structures)." Physics of Aerodisperse Systems, no. 54 (December 14, 2017): 66–82. http://dx.doi.org/10.18524/0367-1631.2017.54.132732.

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In this paper, a method for the determination of the efficiency and limitations of the evaporative cooling process is presented. Ceramic is employed as a packing material in the evaporative equipment. It is shown that the experimental efficiency of the ceramic packing is 10-20% higher as compared to packings made of aluminum foil and multichannel polycarbonate plates because of the absence of common liquid film on the packing surface, and due to the absolute wettability of the ceramic packing. Heat and mass transfer equipment for desiccant-evaporative cooling systems (direct and indirect evapo

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9

Zheng, Linhe, Zhilin Liu, Guosheng Li, ShouZheng Yuan, and Songbai Yang. "Experimental and numerical investigation on control strategies for heave and pitch motion reduction of a catamaran." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 235, no. 2 (2021): 311–26. http://dx.doi.org/10.1177/1475090221993650.

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In this study, simulations and experiments were conducted on reducing the heave and pitch motions of a catamaran. To serve as stability appendages, an actively controlled T-foil and flap were designed, including their dimensions and installation position on the catamaran. Based on the uncoupled analysis of the appendages, the following control strategies were adopted: the previously proposed resultant force and moment distribution with feedback by displacement (RFMD-D) and the newly developed resultant force and moment distribution with feedback by velocity (RFMD-V). These two control strategi

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10

XU, MAI, MARIA PETROU, and JIANHUA LU. "LEARNING LOGIC RULES FOR THE TOWER OF KNOWLEDGE USING MARKOV LOGIC NETWORKS." International Journal of Pattern Recognition and Artificial Intelligence 25, no. 06 (2011): 889–907. http://dx.doi.org/10.1142/s0218001411008610.

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In this paper, we propose a novel logic-rule learning approach for the Tower of Knowledge (ToK) architecture, based on Markov logic networks, for scene interpretation. This approach is in the spirit of the recently proposed Markov logic networks for machine learning. Its purpose is to learn the soft-constraint logic rules for labeling the components of a scene. In our approach, FOIL (First Order Inductive Learner) is applied to learn the logic rules for MLN and then gradient ascent search is utilized to compute weights attached to each rule for softening the rules. This approach also benefits

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11

Kapulla, R., G. Mignot, S. Paranjape, M. Andreani, and D. Paladino. "Large Scale Experiments Representing a Containment Natural Circulation Loop during an Accident Scenario." Science and Technology of Nuclear Installations 2018 (November 1, 2018): 1–12. http://dx.doi.org/10.1155/2018/8989070.

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The assessment of hydrogen release, distribution, and mitigation measures in the containment of a nuclear power plant is increasingly based on code calculations. These calculations require state-of-the-art experiments to benchmark the codes against them. Two of these experiments are presented in this paper. These experiments were conducted in the PANDA facility (Switzerland) in the framework of the OECD/NEA HYMERES project. The experiments consider natural circulation flow in a two-room type containment where flow loops can form between the inner and the outer zones. During normal operation th

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12

Das, Anil, Ratnesh K. Shukla, and Raghuraman N. Govardhan. "Contrasting thrust generation mechanics and energetics of flapping foil locomotory states characterized by a unified - scaling." Journal of Fluid Mechanics 930 (November 11, 2021). http://dx.doi.org/10.1017/jfm.2021.910.

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Self-propelled flapping foils with distinct locomotion-enabling kinematic restraints exhibit a remarkably similar Strouhal number ( $St$ )-Reynolds number ( $Re$ ) dependence. This similarity has been hypothesized to pervade diverse forms of oscillatory self-propulsion and undulatory biolocomotion; however, its genesis and implications on the energetic cost of locomotion remain elusive. Here, using high-resolution simulations of translationally free and restrained foils that self-propel as they are pitched, we demonstrate that a generality in the $St$ - $Re$ relationship can emerge despite sig

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13

Hermann, Martin, Markus Isser, Valentin Bilgeri, Andreas Klinger, and Wolfgang Lederer. "Thin foil body-shield resuscitation barrier device to protect from blood: an experimental study." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-17915-4.

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AbstractIn times of collective concern about pandemics, body-shield resuscitation barrier devices are more and more considered to protect against transmission of different pathogens between rescuers and patients. The objective of this experimental study was to investigate the characteristics of blood drops dispersed on the surface of four different foils suitable for blanketing patients during resuscitation. We analyzed run-off characteristics of blood stains depending on surface properties of polyvinyl chloride, polyethylene, polyethylene terephthalate and aluminum-coated polyethylene terepht

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14

Nikiforova, MA, AE Siniavin, EV Shidlovskaya, NA Kuznetsova, and VA Guschin. "Evaluation of SARS-CoV-2 viability on experimental surfaces over time." Bulletin of Russian State Medical University, no. 2021(4) (July 2021). http://dx.doi.org/10.24075/brsmu.2021.033.

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Infected SARS-CoV-2 virus occurs not only through contact with an infected person, but also through surfaces with wich the illnes has contacted. The problem of preserving an infectious virus over time capable of infecting remains actual. We evaluated the SARS-CoV-2 viability preservation on different model surfaces over time. Ceramic tiles, metal (aluminum foil), wood (chipboard), plastic and cloth (towel) were used as model materials. Assessment of the presence of SARS-CoV-2 RNA was carried out by quantitative RT-PCR. Viable virus was determined by tissue culture assay on 293T/ACE2 cells. It

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15

Vekszler, György, Matthias Granner, Elena Nebot Valenzuela, et al. "Microarchitecture of historic bone samples with tuberculosis." Wiener klinische Wochenschrift, March 20, 2022. http://dx.doi.org/10.1007/s00508-022-02017-y.

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SummaryTuberculosis is among the leading causes of death from infectious diseases and affects many organ systems, including the skeleton. Skeletal tuberculosis is an extrapulmonary stage of tuberculosis, which occurs after the early and post-primary pulmonary stages of the disease. The aim of our study was to assess the microarchitecture of historic dry bone samples of subjects who have died of tuberculosis documented by post-mortem examinations. These preparations date to the pre-antibiotic era, and were provided by the Pathological-Anatomical Collection in the “Fools Tower” of the Natural Hi

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16

Caldwell, Tracy M. "Identity Making from Soap to Nuts." M/C Journal 6, no. 1 (2003). http://dx.doi.org/10.5204/mcj.2149.

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The release of the film Fight Club (Dir. David Fincher, 1999) was met with an outpouring of contradictory reviews. From David Ansen’s [Newsweek] claim that “Fight Club is the most incendiary movie to come out of Hollywood in a long time” (Fight Club DVD insert) to LA Times’s Kenneth Turan who proclaimed Fight Club to be “…a witless mishmash of whiny, infantile philosophising and bone-crushing violence that actually thinks it’s saying something of significance” (Fight Club DVD insert), everyone, it seemed, needed to weigh in with their views. Whether you think the film is a piece of witless and

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