Results 81 to 90 of about 4,556 (210)

Transition between Two Oscillation Modes

, 2002
A model for the symmetric coupling of two self-oscillators is presented. The nonlinearities cause the system to vibrate in two modes of different symmetries.
B. van der Pol, B.R. Noack, C. Mathis, D.G. Aronson, E. Villermaux, H. Bénard, P. Manneville, R. López-Ruiz, Y. Pomeau, Y. Pomeau   +9 more
core   +1 more source

Adaptive respiratory muscle trainer based on hybrid nanogenerator sensor and artificial intelligence

InfoMat, Volume 7, Issue 6, June 2025.
We manufacture a training device for respiratory muscle resistance training, with respiratory states sensing and resistance self‐adaption. Abstract Respiratory muscle training can improve respiratory function by strengthening muscle mass, which is of great help to populations with respiratory system diseases and athletes.
Ziao Xue, Puchuan Tan, Jiangtao Xue, Yuan Xi, Minghao Liu, Yang Zou, Qiang Zheng, Zhou Li, Yuxiang Wu   +8 more
wiley   +1 more source

Vortex flow around a pair of in-line forced oscillating tandem arranged circular cylinder

Nihon Kikai Gakkai ronbunshu, 2014
In this study, the flow features of vortex shedding from a pair of tandem arranged circular cylinders oscillating along the direction of the flow were observed by visualizing water flow experiment at the ranges of the frequency ratio f/fK=0～6.2 (28 steps)
Yoshifumi YOKOI
doaj   +1 more source

Three-dimensional instabilities of a stratified cylinder wake

, 2014
International audienceThis paper describes experimentally, numerically and theoretically how the three-dimensional instabilities of a cylinder wake are modified by the presence of a linear density stratification.
Bosco, M, Meunier, P
core   +3 more sources

Flume Experiments With Refractive‐Index Matched Sediment Revealing the Impact of Two In‐Line Channel‐Spanning Logs on Hyporheic Exchange

Water Resources Research, Volume 61, Issue 6, June 2025.
Abstract In‐channel wood, a critical component of forested rivers, has the capacity to enhance hyporheic flow. This process facilitates the continuous exchange of gases, solutes, and nutrients across the sediment‐water interface, regulating pollutant transport and biogeochemical cycles in rivers.
S. H. Huang, A. H. Sawyer, E. Wohl, J. Q. Yang   +3 more
wiley   +1 more source

The Effects of Wing Rotation on Unsteady Aerodynamic Performance at Low Reynolds Numbers [PDF]

, 1994
The downstroke-to-upstroke transition of many insects is characterized by rapid wing rotation. The aerodynamic consequences of these rapid changes in angle of attack have been investigated using a mechanical model dynamically scaled to the Reynolds ...
Dickinson, Michael H.
core  

Kármán Vortex Street Driven Membrane Triboelectric Nanogenerator for Enhanced Ultra-Low Speed Wind Energy Harvesting and Active Gas Flow Sensing. [PDF]

ACS Appl Mater Interfaces, 2022
Li W, Lu L, Fu X, Zhang C, Loos K, Pei Y.   +5 more
europepmc   +1 more source

Enhancing Kármán Vortex Street Detection via Auxiliary Networks Incorporating Key Atmospheric Parameters

Atmosphere
Kármán vortex streets are quintessential phenomena in fluid dynamics, manifested by the periodic shedding of vortices as airflow interacts with obstacles.
Yihan Zhang, Zhi Zhang, Qiao Su, Chaoyue Wu, Yuqi Zhang, Daoyi Chen   +5 more
doaj   +1 more source

Large Eddy Simulation of Flow over Wavy Cylinders with Different Twisted Angles at a Subcritical Reynolds Number

Journal of Marine Science and Engineering, 2019
The deformation of the cylinder has been proved to greatly reduce the fluctuation of lift and the vortex-induced vibration. In this article, a new form of deformation mode for the smooth cylinder is proposed in order to reduce the vortex-induced ...
Chunyu Guo, Hang Guo, Jian Hu, Kewei Song, Weipeng Zhang, Wei Wang   +5 more
doaj   +1 more source

Stability investigations of airfoil flow by global analysis [PDF]

As the result of global, non-parallel flow stability analysis the single value of the disturbance growth-rate and respective frequency is obtained. This complex value characterizes the stability of the whole flow configuration and is not referred to any ...
Morzynski, Marek, Thiele, Frank
core   +1 more source