scholarly journals A scalar imaging velocimetry technique for fully resolved four‐dimensional vector velocity field measurements in turbulent flows

1992 ◽  
Vol 4 (10) ◽  
pp. 2191-2206 ◽  
Author(s):  
Werner J. A. Dahm ◽  
Lester K. Su ◽  
Kenneth B. Southerland
Keyword(s):  
Velocity Field ◽  
Turbulent Flows ◽  
Field Measurements ◽  
Dimensional Vector ◽  
Vector Velocity ◽  
Vector Velocity Field

scholarly journals Wave mixing in a system of moving coaxial cylinders

2019 ◽  
Vol 486 (1) ◽  
pp. 30-33
Author(s):  
R. F. Ganiev ◽  
D. L. Reviznikov ◽  
T. Yu. Sukharev ◽  
L. E. Ukrainskii
Keyword(s):  
Computer Simulation ◽  
Velocity Field ◽  
Flow Field ◽  
Singular Points ◽  
Wave Mixing ◽  
Coaxial Cylinders ◽  
Laboratory Bench ◽  
Vector Velocity ◽  
Vector Velocity Field

The results of computer simulation of mixing in a system of moving coaxial cylinders are presented. Detailed spatial-temporal pictures of the processes occurring were obtained and the main structures in the flow field were determined. Based on the analysis of the singular points of the vector velocity field of the liquid, a method for profiling the rotor is proposed. Introduced dimensionless quantities, the use of which allows the transition from laboratory bench installations to real production devices.

scholarly journals Results analysis of the tests and certification of near-airfield meteorological radar complex

2020 ◽  
Vol 23 (1) ◽  
pp. 28-40
Author(s):  
K. I. Galaeva
Keyword(s):  
Velocity Field ◽  
Meteorological Data ◽  
A Priori ◽  
Radar Data ◽  
Sources Of Information ◽  
Movement Vector ◽  
Vector Velocity ◽  
Meteorological Radar ◽  
Characteristic Features ◽  
Vector Velocity Field

The article presents the tasks, characteristic features, tactical and technical characteristics, the possible location and scope of the near-airfield meteorological radar complex. The analysis is made of the comparison of meteorological radar data from the near-airfield meteorological radar complex with reliable sources of meteorological information obtained during preliminary, acceptance, certification tests. The features of carrying out during the validation tests of meteorological radar data of the near-airfield meteorological radar complex are described, namely: dangerous meteorological phenomena (showers of different intensities, thunderstorms with a probability of 30-70%, 71-90%, > 90%, hail of varying degrees of intensity, squall of different intensities), velocity and direction of movement of cloud formations, vector velocity field. Examples of comparing the data of the near-airfield meteorological radar complex with data from a priori reliable sources of information are shown in the form of maps, graphs and tables. It is shown that the data of the near-airfield meteorological radar complex were obtained during testing and certification covering the warm and cold periods of the year, the sample size is statistically significant (except for the sample to assess the vector velocity field from data of aircraft and radar due to the spatial-temporal features comparing data from the two indicated information sources). It was established that the near-airfield meteorological radar complex provides acceptable in accordance with the requirements the construction quality of meteorological phenomena maps, the vector velocity field and the estimation of the cloud formations movement vector. The article illustrates the results of the statistical analysis of the data of the near-airfield meteorological radar complex, obtained personally by the author of the article. Analysis of meteorological data of the near-airfield meteorological radar complex was carried out with the aim of further exploitation of the near-airfield meteorological radar complex.

Comments on the reconnexion rate of magnetic fields

1973 ◽  
Vol 9 (1) ◽  
pp. 49-63 ◽  
Author(s):  
E. N. Parker
Keyword(s):  
Velocity Field ◽  
Magnetic Fields ◽  
Turbulent Flows ◽  
Similarity Solutions ◽  
Neutral Point ◽  
Solar Photosphere ◽  
Complete Field ◽  
Fluid Equations ◽  
The Galaxy

The reconnexion rate of magnetic fields is crucial in understanding the fields found in turbulent flows in the solar photosphere and in the galaxy, and in flare phenomena. This paper examines the behaviour of magnetic fields in the neighbourhood of an X-type neutral point. The treatment is kinematical, specifying the velocity field v and constructing solutions to the hydromagnetic equation for B. The calculations demonstrate that the reconnexion rate is controlled by the diffusion in the near neighbourhood of the neutral point, and is not arbitrarily large, as has been suggested by similarity solutions of the complete field and fluid equations for vanishing diffusion

Assessment of Certainty of Ventilation Processes Mathematical Modeling

2015 ◽  
Vol 725-726 ◽  
pp. 1255-1260
Author(s):  
Tamara Daciuk ◽  
Vera Ulyasheva
Keyword(s):  
Mathematical Modeling ◽  
Turbulent Flows ◽  
Turbulence Models ◽  
Field Measurements ◽  
Heat Emission ◽  
Emission Sources ◽  
Wide Range ◽  
Calculation Results ◽  
Definition Of ◽  
Semiempirical Models

Numerical experiment has been successfully used during recent 10-15 years to solve a wide range of thermal and hydrogasodynamic tasks. Application of mathematical modeling used to design the ventilation systems for production premises characterized by heat emission may be considered to be an effective method to obtain reasonable solutions. Results of calculation performed with numerical solution of ventilation tasks depend on turbulence model selection. Currently a large number of different turbulence models used to calculate turbulent flows are known. Testing and definition of applicability limits for semiempirical models of turbulence should be considered to be a preliminary stage of calculation. This article presents results of test calculations pertaining to thermal air process modeling in premises characterized by presence of heat emission sources performed with employment of different models of turbulence. Besides, analysis of calculation results and comparison with field measurements data are presented.

Velocity field measurements of a laminar thermal

1979 ◽  
Vol 22 (6) ◽  
pp. 1044 ◽  
Author(s):  
D. J. Shlien ◽  
A. Brosh
Keyword(s):  
Velocity Field ◽  
Field Measurements
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