scholarly journals Characterization of Strong Nonlinear Phenomena of Free Surface Due to Parametric Excitation

2013 ◽  
Vol 02 (01) ◽  
pp. 13-19
Author(s):  
群峰 徐
Keyword(s):  
Free Surface ◽  
Parametric Excitation ◽  
Nonlinear Phenomena

Characterization of Air-Entrainment in a Plunging Water Jet System Using Image Processing: An Educational Approach

2011 ◽  
Author(s):  
Arman Molki ◽  
Lyes Khezzar ◽  
Afshin Goharzadeh
Keyword(s):  
Image Processing ◽  
Free Surface ◽  
Flow Behavior ◽  
Air Entrainment ◽  
Experimental Setup ◽  
Water Mixture ◽  
Educational Approach ◽  
Image Processing Techniques ◽  
Processing Techniques

This paper outlines a proposed experimental setup and image processing techniques using MATLAB for the characterization of the average dynamic behavior of the air/water mixture under the free surface of water penetrated by a plunging jet. The proposed setup focuses on the dynamics of air entrainment below the free surface and the identification of the major regimes related to the entrainment process of bubbles in water, namely: (a) no-entrainment, (b) incipient entrainment, (c) intermittent entrainment, and (d) continuous entrainment. The experimental setup allows students to observe the flow behavior below the free liquid surface and determine the penetration depth of the bubble plumes using image processing techniques in MATLAB. The focal point of the experiment is image analysis for qualitative and quantitative characterization of the bubble plume.

scholarly journals <i>Preface</i> "Nonlinear processes in oceanic and atmospheric flows"

2010 ◽  
Vol 17 (3) ◽  
pp. 283-285
Author(s):  
A. M. Mancho ◽  
S. Wiggins ◽  
A. Turiel ◽  
E. Hernández-García ◽  
C. López ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Southern Oscillation ◽  
Statistical Properties ◽  
Nonlinear Phenomena ◽  
Special Issue ◽  
Nonlinear Processes ◽  
Multidisciplinary Collaboration ◽  
Atmospheric Processes ◽  
Atmospheric Flows

Abstract. Nonlinear phenomena are essential ingredients in many oceanic and atmospheric processes, and successful understanding of them benefits from multidisciplinary collaboration between oceanographers, meteorologists, physicists and mathematicians. The present Special Issue on "Nonlinear Processes in Oceanic and Atmospheric Flows" contains selected contributions from attendants to the workshop which, in the above spirit, was held in Castro Urdiales, Spain, in July 2008. Here we summarize the Special Issue contributions, which include papers on the characterization of ocean transport in the Lagrangian and in the Eulerian frameworks, generation and variability of jets and waves, interactions of fluid flow with plankton dynamics or heavy drops, scaling in meteorological fields, and statistical properties of El Niño Southern Oscillation.

Strongly Nonlinear Phenomena in Extreme Waves

2015 ◽  
Author(s):  
Alessandro Iafrati ◽  
Francesco Vita ◽  
Alessandro Toffoli ◽  
Alberto Alberello
Keyword(s):  
Free Surface ◽  
Modulational Instability ◽  
Numerical Approach ◽  
Nonlinear Phenomena ◽  
Surface Dynamics ◽  
Extreme Waves ◽  
Strongly Nonlinear ◽  
Free Surface Waves ◽  
Steep Waves ◽  
Free Surface Dynamics

In this paper the breaking of steep free surface waves is investigated by a two-fluid numerical approach. The study is focused at providing estimates of the energy dissipation and the variations to the spectrum associated to the breaking process. The simulations make available a highly refined description of the flow in both air and water which is also important for the estimates of load in severe conditions. Two different approaches are used to produce steep waves. A first approach exploits the classical Benjamin-Feir instability which generates extreme waves through the modulational instability process. In a second application a more realistic, narrow-banded, JONSWAP spectrum is used. Results are presented in terms of free surface dynamics and energy, separated in kinetic and potential components. The changes operated by the breaking occurrence on the spectrum are also discussed.

scholarly journals Characterization of a micro-hydrokinetic turbine in close proximity to the free surface

2015 ◽  
Vol 110 ◽  
pp. 270-280 ◽  
Author(s):  
Jacob Riglin ◽  
W. Chris Schleicher ◽  
I-Han Liu ◽  
Alparslan Oztekin
Keyword(s):  
Free Surface ◽  
Hydrokinetic Turbine ◽  
Close Proximity

Experimental Characterization of Air-Entrainment in a Plunging Water Jet System Using Particle Image Velocimetry (PIV)

2010 ◽  
Author(s):  
Xiaoliang Qu ◽  
Afshin Goharzadeh ◽  
Lyes Khezzar ◽  
Arman Molki
Keyword(s):  
Particle Image Velocimetry ◽  
Free Surface ◽  
Particle Image ◽  
Air Entrainment ◽  
Water Jet ◽  
Experimental Characterization ◽  
Free Jet ◽  
Image Velocimetry ◽  
Plunging Water Jet

This paper presents a detailed experimental study of a plunging jet on a free liquid surface. An experimental characterization facility is designed and constructed for generating a vertical round water jet impinging on a free surface of a pool. The experimental analysis focuses on the jet penetration depth, its relation to impact velocity Vj and free jet length Lj. Present results are compared with previous studies. The flowmap for four different regimes, in terms of impact jet velocity is obtained. The details of the two-dimensional velocity field below the pool liquid free surface under a no-entrainment regime, is obtained using Particle Image Velocimetry (PIV) and reveals the entrainment behavior of the impinging jet flow below the interface.

Characterization of finitely generated groups by types

2018 ◽  
Vol 28 (08) ◽  
pp. 1613-1632 ◽  
Author(s):  
A. G. Myasnikov ◽  
N. S. Romanovskii
Keyword(s):  
Free Surface ◽  
Nilpotent Group ◽  
Solvable Groups ◽  
Polycyclic Group ◽  
Finitely Generated ◽  
Finitely Generated Groups ◽  
Burnside Groups ◽  
Text Types ◽  
Rigid Group

In this paper we show that all finitely generated nilpotent, metabelian, polycyclic, and rigid (hence free solvable) groups [Formula: see text] are fully characterized in the class of all groups by the set [Formula: see text] of types realized in [Formula: see text]. Furthermore, it turns out that these groups [Formula: see text] are fully characterized already by some particular rather restricted fragments of the types from [Formula: see text]. In particular, every finitely generated nilpotent group is completely defined by its [Formula: see text]-types, while a finitely generated rigid group is completely defined by its [Formula: see text]-types, and a finitely generated metabelian or polycyclic group is completely defined by its [Formula: see text]-types. We have similar results for some non-solvable groups: free, surface, and free Burnside groups, though they mostly serve as illustrations of general techniques or provide some counterexamples.

scholarly journals Characterization of 3C-SiC Films Grown on 4H- and 6H-SiC Substrate Mesas during Step-Free Surface Hetero-Epitaxy

2003 ◽  
Vol 433-436 ◽  
pp. 213-216 ◽  
Author(s):  
Philip G. Neudeck ◽  
J. Anthony Powell ◽  
David J. Spry ◽  
Andrew J. Trunek ◽  
X. Huang ◽  
...  
Keyword(s):  
Free Surface ◽  
Sic Films
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