Results 11 to 20 of about 1,802 (177)
Undulatory Propulsion at Milliscale on Water Surface. [PDF]
Adv Sci (Weinh)The water‐surface propulsion of an undulatory swimmer stems from the complex interplay of various forces that are generated by the body's waveform and the waves at the water‐air interface. Adjusting the material and dimensions of the body, along with the excitation manner of the head, allows for tuning of the swimmer's waveform that is crucial for ...
Ren Z, Ucak K, Yan Y, Sitti M.
europepmc +2 more sources
EFFECTS OF TWO TYPES OF CONTROLLABLE DEFORMATION ON ENERGY EXTRACTION OF A FLEXIBLE HYDROFOIL
Brodogradnja, 2022 Energy extraction capacity of controllably flexible hydrofoil was studied under two identified deformation modes. Deformation modes, flexure parameters (flexure amplitude and flexure coefficient ) and motion parameters (reduced frequency f* and ...
Yubing Zhang +4 more
doaj +1 more source
Energies, 2021 The paper focuses on the study of a semi-activated system, based on a combination of two movements of forced pitching and free-heaving motion. Therefore, quantifying with accuracy the hydrodynamic forces applied on the hydrofoil seems to be crucial. This
Paul Brousseau +2 more
doaj +1 more source
Tip Vortex Cavitation on an Oscillating Hydrofoil [PDF]
Journal of Fluids Engineering, 1997 This paper discusses tests conducted in the hydrodynamic tunnel of the University of Grenoble on a 3D oscillating hydrofoil. Visualization of unsteady tip vortex cavitation indicates a strong influence of the water nuclei content. The investigation was focused on the influence of the oscillation frequency on tip vortex cavitation inception.
Boulon, Olivier +2 more
openaire +2 more sources
A Simplified Mathematical Model of Pumped Hydrofoils
Journal of Marine Science and Engineering, 2023 This paper presents a simplified mathematical model of a pumped hydrofoil (PH)—a surfboard elevated above water surface and connected to a tandem of hydrofoils by a strut. The PH is operated by a rider who stands on the surfboard and produces swinging up-
Kirill Rozhdestvensky
doaj +1 more source
Developments and Challenges of Miniature Piezoelectric Robots: A Review
Advanced Science, Volume 10, Issue 36, December 27, 2023., 2023 Miniature piezoelectric robots (MPRs) have exhibited many highlight features and captured considerable attentions and favor of numerous scholars. A comprehensive review of recent development in MPRs is provided, including the operating environment, the structure of piezoelectric actuating element, working principle, attempts of new fabricated methods ...
Jing Li +5 more
wiley +1 more source
The Canadian Journal of Chemical Engineering, Volume 101, Issue 10, Page 6003-6016, October 2023., 2023 Drawbacks in phase change models in simulating flashing of steam with a subsaturation downstream boundary condition. Abstract The development of phase change models applicable to a wide range of temperatures, pressures, and mass flow rates is primarily limited by the metastable or partially stable behaviour of the fluid. Due to this, the fluid does not
Stanley John, Carlos F. Lange
wiley +1 more source
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
Journal of Marine Science and Engineering, 2019 To improve the energy extraction performance of the oscillating hydrofoil, the lift force that acts on the oscillating hydrofoil is analyzed. The pressure difference between the oscillating hydrofoil‘s opposing surfaces is dominant to generate the ...
Jianan Xu +3 more
doaj +1 more source
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