EXPERIMENTAL STUDY OF DRIFT OBJECTS USING SPATIOTEMPORAL DATA UNDER COMPLEX VELOCITY FIELD

2020 ◽  
Vol 76 (2) ◽  
pp. I_313-I_318
Author(s):  
Yu CHIDA ◽  
Nobuki FUKUI ◽  
Nobuhito MORI ◽  
Tomohiro YASUDA ◽  
Takashi YAMAMOTO
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Spatiotemporal Data ◽  
Complex Velocity

The Effect of Longitudinal Core Flow on Trailing Vortex Stability

2014 ◽  
Author(s):  
Amir Allaf-Akbari ◽  
A. Gordon L. Holloway ◽  
Joseph Hall
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Kinetic Energy ◽  
Vortex Core ◽  
Vortex Generator ◽  
Core Flow ◽  
Vortex Stability ◽  
Vorticity Distribution ◽  
Air Jet ◽  
Jet Velocities

The current experimental study investigates the effect of longitudinal core flow on the formation and structure of a trailing vortex. The vortex is generated using four airfoils connected to a central hub through which a jet flow is added to the vortex core. Time averaged vorticity, circumferential velocity, and turbulent kinetic energy are studied. The statistics of vortex wandering are identified and corrections applied to the vorticity distribution. The vortex generator used in this study was built on the basis of the design described by Beninati et al. [1]. It uses four NACA0012 airfoils connected to a central hub. The wings orientation can be adjusted such that each contributes to a strong trailing vortex on the center of the test section. The vortex generator also had the capability to deliver an air jet directed longitudinally through a hole in the hub at the joint of the airfoils. Tests were done without the jet and with the air jet at jet velocities of 10 and 20 m/s. Planar PIV was used to measure the velocity field in the vicinity of the vortex core. The measurements were taken at 3 chords behind the vortex generator.

scholarly journals Adaptive regridding in 3D reflection tomography

1997 ◽  
Vol 40 (1) ◽  
Author(s):  
G. Böhm ◽  
G. Rossi ◽  
A. Vesnaver
Keyword(s):  
Velocity Field ◽  
A Priori ◽  
A Priori Information ◽  
Complex Velocity ◽  
Variable Resolution ◽  
Fitting Procedure ◽  
Voronoi Polygons ◽  
Fully Automatic ◽  
Priori Information ◽  
Reflection Tomography

3D reflection tomography allows the macro-model of complex geological structures to be reconstructed. In the usual approach, the spatial distribution of the velocity field is discretized by regular grids. This choice simplifies the development of the related software, but introduces two serious drawbacks: various domains of the model may be poorly covered, and a relevant mismatch between the grid and a complex velocity field may occur. So the tomographic inversion becomes unstable, unreliable and necessarily blurred. In this paper we introduce an algorithm to adapt the grid to the available ray paths and to the velocity field in sequence: so we get irregular grids with a locally variable resolution. We can guide the grid fitting procedure interactively, if we are going to introduce some geological a priori information; otherwise, we define a fully automatic approach, which exploits the Delauny triangles and Voronoi polygons.

An Experimental Study of the Velocity Field during Filling of an Ingot Mould

2003 ◽  
Vol 74 (7) ◽  
pp. 423-430 ◽  
Author(s):  
Robert Eriksson ◽  
Anders Tilliander ◽  
Lage Jonsson ◽  
Pär Jönsson
Keyword(s):  
Experimental Study ◽  
Velocity Field

Hydraulics of offset baffle culvert fishways

1988 ◽  
Vol 15 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation

This paper presents the results of an experimental study on the hydraulics of culverts with offset baffles to pass fish. Using analytical considerations and experimental observations, a flow equation has been developed between the discharge, diameter, depth, and slope for a culvert fish way with the standard offset baffle system. The velocity field at the slot has also been evaluated. Some further experiments were performed to assess the effect of baffle spacing and height on the hydraulics of the culvert fishway. Key words: culverts, fishways, baffles, hydraulics, open-channel flow, turbulent flow.

EXPERIMENTAL STUDY OF THE VELOCITY FIELD IN SOLITARY WATER WAVES

2012 ◽  
Vol 19 (sup1) ◽  
pp. 23-33 ◽  
Author(s):  
HUNG-CHU HSU ◽  
YANG-YIH CHEN ◽  
CHU-YU LIN ◽  
CHIA-YAN CHENG
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Water Waves

Experimental study of the velocity field in Rayleigh-Bénard convection

1978 ◽  
Vol 85 (4) ◽  
pp. 641-653 ◽  
Author(s):  
M. Dubois ◽  
P. Bergé
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Local Velocity ◽  
Velocity Measurements ◽  
Bénard Convection ◽  
Benard Convection ◽  
Theoretical Predictions ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Velocity Mode

Local velocity measurements performed in a convecting layer of fluid show that the velocity field can be described by a dominant fundamental velocity mode mixed with an increasing proportion of second and third harmonics as ε, the reduced distance to the convective thresholdRc, is increased from 0 to ∼ 10. The spatial and thermal dependences of the amplitudes of these different modes are reported and compared with theoretical predictions.

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