A New Methodology for Generation of Solitary Water Waves in Laboratory

2020 ◽  
Author(s):  
Xiao Liu ◽  
Yong Liu
Keyword(s):  
Solitary Wave ◽  
Wave Height ◽  
Water Waves ◽  
Particle Image ◽  
Fluid Velocity ◽  
Simple System ◽  
Wave Surface ◽  
Wave Flume ◽  
Image Velocimetry ◽  
Laboratory Flume

Abstract In this article, a very simple system based on the enhanced dam-break flows was proposed and implemented to generate solitary wave with larger relative wave height (the ratio of wave height to water depth) in a laboratory flume. The experimental results showed that stable waves with the solitary wave profiles were successfully generated in the wave flume. The wave surface elevations were recorded by a series of wave gauges, and the fluid velocity field of the solitary wave was measured by Particle Image Velocimetry (PIV) system. The measurements of solitary wave profile, celerity and horizontal fluid velocity were also compared with the predictions by three different solitary wave theories. Results demonstrated that the present simple system was reliable and effective for the generation of solitary waves in laboratory.

Viscous flows in a muddy seabed induced by a solitary wave

2008 ◽  
Vol 598 ◽  
pp. 383-392 ◽  
Author(s):  
YONG SUNG PARK ◽  
PHILIP L.-F. LIU ◽  
STEPHEN J. CLARK
Keyword(s):  
Solitary Wave ◽  
Water Waves ◽  
Particle Image ◽  
Plug Flow ◽  
Viscous Flows ◽  
The Other ◽  
Viscous Layer ◽  
Shallow Water Waves ◽  
Image Velocimetry ◽  
Wave Induced

Liu & Chan (J. Fluid Mech. vol. 579, 2007, p. 467, hereinafter referred to as LC) derived analytical solutions for the interactions between shallow water waves and a viscous fluid seabed. In this paper we present a set of new experimental data on the solitary-wave-induced flows in a viscous muddy seabed so as to validate LC's theory and the approximations employed. In the experiments a clear silicone fluid was used as the viscous mud and particle image velocimetry was employed to measure the velocity field inside the viscous mud. The shear stress along the bottom of the mud bed and the displacement of the water--mud interface were also deduced from data. Experimental results showed excellent agreement with the theoretical solutions. Additional analyses were performed to show that the ratio of the muddy seabed thickness to the corresponding bottom boundary-layer thickness, $\dbar$, plays an important role in characterizing mud flow regimes. When $\dbar\,{\leq}\,1$, the vertical profile of the horizontal velocity in the mud bed can be parameterized as a parabola. On the other hand, when $\dbar\,{\gg}\,1$, the velocity profile appears as a plug flow above a thin viscous layer. When $ \dbar\,{\sim}\,O(1)$, the flow patterns are more complex than the other two regimes and flow reversal can occur inside the viscous mud bed.

Flow Field Analysis of Dielectrophoretically-Suspended Particles

2007 ◽  
Author(s):  
Stuart J. Williams ◽  
Steven T. Wereley
Keyword(s):  
Electric Fields ◽  
Particle Image ◽  
Fluid Velocity ◽  
Microfluidic Channel ◽  
Velocity Fields ◽  
Field Analysis ◽  
Tracer Particles ◽  
Image Velocimetry ◽  
Flow Field Analysis ◽  
Complete Investigation

Understanding the fluid dynamics around a particle in suspension is important for a complete investigation of many hydrodynamic phenomena, including microfluidic models. A novel tool that has been used to analyze fluid velocity fields in microfluidics is micro-resolution particle image velocimetry (μPIV) [1]. Dielectrophoresis (DEP) is a technique that can translate and trap particles by induced polarization in the presence of nonuniform electric fields. In this paper, DEP has been used to capture and suspend a single 10.1μm diameter spherical particle in a microfluidic channel. μPIV is then used with smaller tracer particles (0.5μm) to investigate the hydrodynamics of fluid flow past the trapped particle.

Direct measurement of fluid velocity in an electrospinning jet using particle image velocimetry

2007 ◽  
Vol 102 (9) ◽  
pp. 094308 ◽  
Author(s):  
Leon M. Bellan ◽  
Harold G. Craighead ◽  
Juan P. Hinestroza
Keyword(s):  
Particle Image Velocimetry ◽  
Direct Measurement ◽  
Particle Image ◽  
Fluid Velocity ◽  
Image Velocimetry

scholarly journals Assessing the validity of regular wave theory in a short physical wave flume using particle image velocimetry

2021 ◽  
Vol 121 ◽  
pp. 110276
Author(s):  
Christian Windt ◽  
Alix Untrau ◽  
Josh Davidson ◽  
Edward J. Ransley ◽  
Deborah M. Greaves ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Wave Theory ◽  
Regular Wave ◽  
Wave Flume ◽  
Image Velocimetry

Experimental Measurements of Forces on Loose Particle in Motion Over Rough Bed Under Waves Using Oblique Particle Image Velocimetry

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Sanjay N. Havaldar ◽  
Francis C. K. Ting
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Fluid Layer ◽  
Fluid Velocity ◽  
Particle Diameter ◽  
Single Layer ◽  
Wave Direction ◽  
Loose Sediment ◽  
Image Velocimetry ◽  
Rough Bed

Magnitude and phase of major forces that act on a loose non-cohesive particle (sediment) on single layer fixed rough bed (longitudinal slope 2%) were determined from experiments in a laboratory flume under waves. The loose particles were glass spheres of diameter 1.58 ± 0.1 mm and specific gravity 2.5. The range of wave-height-to-water-depth (H/h) ratio in the experiments was 0.366 < H/h < 0.521. The measurement plane was parallel to the bed and located at a height of ½ loose particle diameter (ds) above the rough bed. Grayscale morphological image processing methods were used to separate the fluid and loose sediment phases from the same oblique particle image velocimetry (OPIV) image based on their signature sizes. The OPIV calibration method is presented and validated with conventional particle image velocimetry (PIV) method. Loose particle velocity and accelerations along with the associated fluid velocity and fluid total accelerations in the wave direction were determined simultaneously by processing OPIV used to compute magnitude and phase of major forces that act on the loose sediment particle. It was observed that for same wave period (T), an increase in H/h ratio has a dominant effect on sediment displacements onshore. The phase along with magnitude of the major driving force (drag and fluid accelerations) plays an important role at initiation of loose sediment from its rest position. It is suspected that the loose particle overcomes a critical bed friction force with higher H/h ratio as magnitude of drag force is higher. The resultant force then displaces the sediment onshore which experiences sliding and or rolling motions very close to bed, in a thin fluid layer over maximum protrusion of bed sediments. At the instance, the gravitational force plus bed frictions overcomes the lift force the loose particle attains a new position onshore.

An investigation of the wake recovery of two model horizontal-axis tidal stream turbines measured in a laboratory flume with Particle Image Velocimetry

2018 ◽  
Vol 19 ◽  
pp. 179-188 ◽  
Author(s):  
Stephen M. Simmons ◽  
Stuart J. McLelland ◽  
Daniel R. Parsons ◽  
Laura-Beth Jordan ◽  
Brendan J. Murphy ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Horizontal Axis ◽  
Image Velocimetry ◽  
Laboratory Flume ◽  
Tidal Stream

Characteristics of Vortex Shedding Process Induced by a Solitary Wave Propagating Over a Submerged Obstacle

2006 ◽  
Author(s):  
Chang Lin ◽  
Tsung-Chun Ho ◽  
Shih-Chun Hsieh ◽  
Kuang-An Chang
Keyword(s):  
Solitary Wave ◽  
Vortex Shedding ◽  
Vertical Plate ◽  
Particle Image ◽  
Particle Tracing ◽  
Wave Condition ◽  
Separated Shear Layer ◽  
Image Velocimetry ◽  
Vertical Jet ◽  
Rectangular Model

The generation and evolution of shedding vortices induced by a solitary wave propagating over a two-dimensional submerged obstacle, a rectangular dike or a vertical plate, was investigated experimentally. The vortex shedding process was observed qualitatively using laser induced fluorescence (LIF) technique and particle tracing technique. The velocity fields were measured quantitatively using particle image velocimetry (PIV). Base on the results of the flow visualization, the comparison of the vortex shedding processes between rectangular dike and vertical plate was qualitatively made under the same wave condition. It is noted that the process of either rectangular model or vertical plate can be divided into four common phases, but the characteristics of shedding vortices are different in the same phase. In addition, the velocity similarity profiles for the formation of separated shear layer and the formation of vertical jet were also quantitatively compared between rectangular dike and vertical plate.

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