Mapping of velocity flow fields using the laser-two-focus technique

1989 ◽  
Author(s):  
H. Selbach
Keyword(s):  
Flow Fields ◽  
Velocity Flow

Temperature and velocity flow fields measurements using ultrasonic computer tomography

1998 ◽  
Vol 33 (5-6) ◽  
pp. 395-403 ◽  
Author(s):  
P. Beckord ◽  
G. Höfelmann ◽  
H. O. Luck ◽  
D. Franken
Keyword(s):  
Computer Tomography ◽  
Flow Fields ◽  
Velocity Flow

Reconstruction of temperature and velocity flow fields of aerosols

1992 ◽  
Vol 23 ◽  
pp. 51-54 ◽  
Author(s):  
G. Höfelmann ◽  
H.O. Luck ◽  
P. Beckord
Keyword(s):  
Flow Fields ◽  
Velocity Flow

Tsunami Bore Impingement onto a Vertical Column

2009 ◽  
Vol 4 (6) ◽  
pp. 391-403 ◽  
Author(s):  
Halldor Arnason ◽  
◽  
Catherine Petroff ◽  
Harry Yeh ◽  
◽  
...  
Keyword(s):  
Cross Sections ◽  
Water Surface ◽  
Numerical Models ◽  
Laboratory Data ◽  
Flow Fields ◽  
Laser Doppler Velocimeter ◽  
Vertical Column ◽  
Image Velocimetry ◽  
Velocity Flow ◽  
Temporal And Spatial

In a laboratory wave tank, bores were generated by dam-break: by lifting a gate that initially separated quiescent shallow water from a volume of impounded water. The study was motivated by the problem of tsunami-structure interaction and sought to further the understanding of interactions between the bore-like flow of a broken tsunami wave and structures of different cross sections. Experiments were designed to observe the structure’s effect on the bore as well as the bore’s effect on the structure. This comprehensive study used highly repeatable experiments to measure water-surface variations, velocity flow fields, and forces exerted by bores on vertically erected columns. The temporal and spatial variations of the water-surface elevations were quantified with a Laser-Induced Fluorescence (LIF) technique; velocity flow fields were recorded with a combination of Laser Doppler Velocimeter (LDV) and Digital Particle Image Velocimetry (DPIV); forces on the columns were measured with a miniature load-cell transducer. The laboratory data obtained in the study are available for validating numerical models that predict forces on structures in unsteady flows.

Numerical Simulation of Different Turbulence Models in a Compact Return Diffuser

2015 ◽  
Author(s):  
Ling Zhou ◽  
Tao Lang ◽  
Weidong Shi
Keyword(s):  
Numerical Simulation ◽  
Particle Image ◽  
Turbulence Models ◽  
Detailed Comparison ◽  
Flow Fields ◽  
Test Rig ◽  
Main Method ◽  
Piv Measurements ◽  
Image Velocimetry ◽  
Velocity Flow

CFD have been became the main method to study the pump inner flow patterns. It is important to understand the differences and features of the different turbulence models. In this paper, the velocity flow fields in a compact return diffuser under multi-conditions are studied by CFD and PIV measurements. In the numerical simulation, three turbulence models are used to solve the steady flow filed using high-quality fine structured grids, which are including SST k-ω model, DES model and SST k-ω model with low-Re corrections. A special test rig is designed to carry out the 2D Particle Image Velocimetry (PIV) measurements, and the PIV results are used to validate the CFD results. The detailed comparison between different turbulence models and PIV results is performed. Velocity flow fields in the diffuser middle section are compared and analyzed under different flow rates. SST k-ω model with low-Re correction give a better results comparing to DES and SST k-ω model, especially have a good predication about the vortex core position under strong part-loading conditions.

1696: Velocity-Flow Plots Using Doppler Ultrasonogrpahy: Urodinamic Evaluation on Prostatic Enlargement

2004 ◽  
Vol 171 (4S) ◽  
pp. 448-448
Author(s):  
Hideo Ozawa ◽  
Hiroyuki Nose ◽  
Katsutoshi Uematsu ◽  
Teruhiko Yokoyama ◽  
Hiromi Kumon
Keyword(s):  
Velocity Flow ◽  
Prostatic Enlargement
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