Results 11 to 20 of about 1,159 (176)
Generating controllable velocity fluctuations using twin oscillating hydrofoils: experimental validation [PDF]
Journal of Fluid Mechanics, 2014 AbstractA method for generating controllable two-dimensional velocity fluctuations using two pitching foils was derived theoretically in a previous companion paper. The present work describes the experimental implementation of the method. The experiments are carried out in a re-circulating water channel optimised to provide low turbulence intensity in ...
Harding, S. F. +2 more
openaire +3 more sources
Deep‐time invention and hydrodynamic convergences through amniote flipper evolution
The Anatomical Record, Volume 306, Issue 6, Page 1323-1355, June 2023., 2023 Abstract The diapsid plesiosaurs were pelagic and inhabited the oceans from the Triassic to the Cretaceous. A key evolutionary character of plesiosaurs is the four wing‐like flippers. While it is mostly accepted that plesiosaurs were underwater fliers like marine turtles, penguins, and maybe whales, other swimming styles have been suggested in the past.
Anna Krahl, Ingmar Werneburg
wiley +1 more source
Beltrami fields and knotted vortex structures in incompressible fluid flows
Bulletin of the London Mathematical Society, Volume 55, Issue 3, Page 1059-1103, June 2023., 2023 Abstract This paper gives a survey on recent results about the existence of knotted vortex structures in incompressible fluids. This includes the proof of Lord Kelvin's conjecture on the existence of knotted vortex tubes in steady Euler flows and a new probabilistic approach to address Arnold's speculation that typical Beltrami fields should exhibit ...
Alberto Enciso, Daniel Peralta‐Salas
wiley +1 more source
A Model for Performance Estimation of Flapping Foil Operating as Biomimetic Stream Energy Device
Journal of Marine Science and Engineering, 2020 During the recent period intensive research has focused on the advancement of engineering and technology aspects concerning the development and optimization of wave and current energy converters driven by the need to increase the percentage of marine ...
Iro E. Malefaki, Kostas A. Belibassakis
doaj +1 more source
Ship waves in rivers: Environmental criteria and analysis methods for measurements
River Research and Applications, Volume 39, Issue 4, Page 629-647, May 2023., 2023 Abstract A literature review shows that the most important physical quantities determining environmental impact of ship waves in a waterway are the fluid velocities, maximum and minimum water levels, and size of drawdown events. Fluid velocity can vary strongly in the vertical so that the usual measurements at a single point are not enough unless made ...
John D. Fenton +3 more
wiley +1 more source
Lake dynamics in an Early Jurassic desert: Evidence from the Clarens Formation in southern Africa
Sedimentology, Volume 70, Issue 3, Page 865-894, April 2023., 2023 ABSTRACT Interdune deposits are sensitive to climatic fluctuations and ancient interdune lacustrine systems can reveal the drivers of erg dynamics through time and space. This southern African study details the dynamics of interdune deposition in a vast ancient desert system that was active over Pangaea in the Middle Mesozoic and formed part of one of ...
Howard V. Head, Emese M. Bordy
wiley +1 more source
Applied Sciences, 2018 The goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies.
Minho Ha +5 more
doaj +1 more source
Observations of Shock Waves in Cloud Cavitation [PDF]
, 1998 This paper describes an investigation of the dynamics and acoustics of cloud cavitation, the structures which are often formed by the periodic breakup and collapse of a sheet or vortex cavity.
Brennen, C. E. +2 more
core +1 more source
Effect of Leading Edge Protuberance on Thrust Production of a Dynamically Pitching Aerofoil [PDF]
, 2017 The paper presents a computational analysis of the characteristics of a NACA 634-021 aerofoil modified by incorporating sinusoidal leading-edge protuberances at Re = 14,000.
Benaissa, M. +3 more
core +2 more sources
Current tidal power technologies and their suitability for applications in coastal and marine areas [PDF]
, 2016 A considerable body of research is currently being performed to quantify available tidal energy resources and to develop efficient devices with which to harness them.
A Betz +61 more
core +1 more source