Stereoscopic PIV measurements and numerical simulation of turbulent flow of liquid passing through rectangular apertures in a narrow annulus: influence of aperture shape on velocity field

2015 ◽  
Author(s):  
Yuri Perelstein ◽  
Ephraim J. Gutmark
Keyword(s):  
Numerical Simulation ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Piv Measurements ◽  
Stereoscopic Piv

Distortion of line and surface elements in model turbulent flows

1991 ◽  
Vol 225 ◽  
pp. 529-543 ◽  
Author(s):  
I. T. Drummond ◽  
W. Münch
Keyword(s):  
Numerical Simulation ◽  
Simple Model ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Time Evolution ◽  
Turbulent Flows ◽  
Principal Curvature ◽  
Line Element ◽  
Surface Patch ◽  
Exponential Rate

Material lines and surfaces transported in a random velocity field undergo bending and stretching. In this paper we investigate the time evolution of curvature in line and surface elements both analytically and by numerical simulation for a simple model turbulence. Our analysis is close to that of Pope (1988) for the evolution of curvature in surface elements. We show that the equation governing the evolution of curvature in a line element is very similar to that governing the evolution of the principal curvature in a surface patch. We investigate the circumstances in which the effect of straining fluctuations is to cause the exponential rate of growth of curvature discovered by Pope et al. (1989). Our simulation confirms that the presence of helicity in the turbulent flow results in the development of a non-vanishing mean torsion in a line element. The results of the simulation also suggest that the generation of curvature tends to occur in regions different from those associated with rapid stretching. The generation of torsion, however, is found not to be correlated with either bending or stretching.

Numerical Simulation of MHD Turbulent Flow in a Rectangular Channel with Three-Surface-Coated Multi Layers

2010 ◽  
Vol 37 (5) ◽  
pp. 447-457
Author(s):  
Mitsuhiro Aoyagi ◽  
Hidetoshi Hashizume ◽  
Kazuhisa Yuki ◽  
Satoshi Ito ◽  
Takeo Muroga
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flow ◽  
Rectangular Channel

NUMERICAL SIMULATION OF THE PRESSURE AND DRAG FORCES AROUND THE AHMED BODY UNDER TURBULENT FLOW

2020 ◽  
Author(s):  
Jalusa Maria da Silva Ferrari ◽  
Luciano Noleto ◽  
jhon goulart ◽  
Fábio Kayser
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flow ◽  
Drag Forces ◽  
Ahmed Body

Simulation and Modeling of Turbulent Flows

1996 ◽  
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flow ◽  
Turbulent Flows ◽  
Simulation And Modeling ◽  
Simulation Techniques ◽  
Rational Development ◽  
Group Methods ◽  
Turbulent Closure ◽  
The Subject ◽  
Renormalization Group Methods

This book provides students and researchers in fluid engineering with an up-to-date overview of turbulent flow research in the areas of simulation and modeling. A key element of the book is the systematic, rational development of turbulence closure models and related aspects of modern turbulent flow theory and prediction. Starting with a review of the spectral dynamics of homogenous and inhomogeneous turbulent flows, succeeding chapters deal with numerical simulation techniques, renormalization group methods and turbulent closure modeling. Each chapter is authored by recognized leaders in their respective fields, and each provides a thorough and cohesive treatment of the subject.

Numerical simulation of turbulent flow and forced heat transfer of water/CuO nanofluid inside a horizontal dimpled fin

2019 ◽  
Vol 139 (6) ◽  
pp. 3711-3724
Author(s):  
Farzad Pourfattah ◽  
Omid Ali Akbari ◽  
Vahid Jafrian ◽  
Davood Toghraie ◽  
Elnaz Pourfattah
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Turbulent Flow

scholarly journals Direct Numerical Simulation of Turbulent Flow in a Wavy Channel.

1998 ◽  
Vol 41 (2) ◽  
pp. 447-453 ◽  
Author(s):  
Takashi OHTA ◽  
Yutaka MIYAKE ◽  
Takeo KAJISHIMA
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Wavy Channel

scholarly journals Stereoscopic PIV measurements using low-cost action cameras

2021 ◽  
Vol 62 (3) ◽  
Author(s):  
Theo Käufer ◽  
Jörg König ◽  
Christian Cierpka
Keyword(s):  
Continuous Wave ◽  
Low Cost ◽  
Frame Rate ◽  
Processing Scheme ◽  
Piv Measurements ◽  
Stereoscopic Piv ◽  
Cost Action ◽  
Image Velocimetry ◽  
Frequency Generator ◽  
Educational Applications

Abstract Recently, large progress was made in the development towards low-cost PIV (Particle Image Velocimetry) for industrial and educational applications. This paper presents the use of two low-cost action cameras for stereoscopic planar PIV. A continuous wave laser or alternatively an LED was used for illumination and pulsed by a frequency generator. A slight detuning of the light pulsation and camera frame rate minimizes systematic errors by the rolling shutter effect and allows for the synchronization of both cameras by postprocessing without the need of hardware synchronization. The setup was successfully qualified on a rotating particle pattern in a planar and stereoscopic configuration as well as on the jet of an aquarium pump. Since action cameras are intended to be used at outdoor activities, they are small, very robust and work autarkic. In conjunction with the synchronization and image pre-processing scheme presented herein, those cameras enable stereoscopic PIV in harsh environments and even on moving experiments. Graphic abstract

Novel Environment Enables PIV Measurements of Turbulent Flow around and within Complex Topographies

2020 ◽  
Vol 146 (5) ◽  
pp. 04020033
Author(s):  
Gianluca Blois ◽  
Nathaniel R. Bristow ◽  
Taehoon Kim ◽  
James L. Best ◽  
Kenneth T. Christensen
Keyword(s):  
Turbulent Flow ◽  
Piv Measurements ◽  
Novel Environment

Numerical simulation of reciprocating turbulent flow in a plane channel

2009 ◽  
Vol 21 (9) ◽  
pp. 095106 ◽  
Author(s):  
Massimiliano Di Liberto ◽  
Michele Ciofalo
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flow ◽  
Plane Channel
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