scholarly journals Fuzzy Performance between Surface Fitting and Energy Distribution in Turbulence Runner

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Zhongwei Liang ◽  
Xiaochu Liu ◽  
Bangyan Ye ◽  
Richard Kars Brauwer
Keyword(s):  
Kinetic Energy ◽  
Energy Distribution ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Surface Fitting ◽  
Turbulence Kinetic Energy ◽  
Kinetic Energy Distribution ◽  
Turbulence Energy ◽  
Fuzzy Evaluation ◽  
Performance Results

Because the application of surface fitting algorithms exerts a considerable fuzzy influence on the mathematical features of kinetic energy distribution, their relation mechanism in different external conditional parameters must be quantitatively analyzed. Through determining the kinetic energy value of each selected representative position coordinate point by calculating kinetic energy parameters, several typical algorithms of complicated surface fitting are applied for constructing microkinetic energy distribution surface models in the objective turbulence runner with those obtained kinetic energy values. On the base of calculating the newly proposed mathematical features, we construct fuzzy evaluation data sequence and present a new three-dimensional fuzzy quantitative evaluation method; then the value change tendencies of kinetic energy distribution surface features can be clearly quantified, and the fuzzy performance mechanism discipline between the performance results of surface fitting algorithms, the spatial features of turbulence kinetic energy distribution surface, and their respective environmental parameter conditions can be quantitatively analyzed in detail, which results in the acquirement of final conclusions concerning the inherent turbulence kinetic energy distribution performance mechanism and its mathematical relation. A further turbulence energy quantitative study can be ensured.

Numerical Analysis of the Influence of Different-Shaped Square Cylinders on Water Flow

2012 ◽  
Vol 614-615 ◽  
pp. 604-607
Author(s):  
Jie Gu ◽  
Xiao Li Wang ◽  
Wei Chen ◽  
Xin Qin ◽  
Dan Qing Ma ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Energy Distribution ◽  
Turbulent Kinetic Energy ◽  
Water Flow ◽  
Turbulence Kinetic Energy ◽  
Kinetic Energy Distribution ◽  
Distribution Area ◽  
Square Cylinder ◽  
Square Cylinders ◽  
Contour Lines

A 3D numerical model was performed to simulate the different cases of the water flow across different-shaped square cylinders. Figures of streamlines and turbulent kinetic energy contour lines in different cases were obtained. Through the comparison of streamlines, the areas of strong turbulent kinetic energy and the strongest turbulent kinetic energy nucleus, the results indicated that,(i) two symmetrical vortexes were formed behind the regular quadrilateral square cylinder and the “⊥”-shaped square cylinder ,respectively, and the former were bigger than the latter .While the flow crossed the “±”-shaped square cylinder without forming vortex.(ii) When water flowed around different-shaped square cylinders, from the regular quadrilateral one, the “⊥”-shaped one to the “±”-shaped one, successively, the strong turbulent kinetic energy distribution area, in which turbulence kinetic energy value was above 18,gradually increased; while the strongest turbulence kinetic energy nucleus, whose value of turbulence kinetic energy was the largest among turbulence kinetic energy nucleuses in the strong turbulent kinetic energy distribution area, moved forward gradually and its area was smaller and smaller.

Osborne Reynolds: Energy Methods in Transition and Loss Production: A Centennial Perspective

1995 ◽  
Vol 117 (1) ◽  
pp. 142-153 ◽  
Author(s):  
J. Moore ◽  
J. G. Moore
Keyword(s):  
Kinetic Energy ◽  
Turbulent Flows ◽  
Three Dimensional ◽  
Boundary Layer Transition ◽  
Turbulence Energy ◽  
Energy Methods ◽  
Layer Transition ◽  
Energy Balance Method ◽  
European Working ◽  
Transition Modeling

Osborne Reynolds’ developments of the concepts of Reynolds averaging, turbulence stresses, and equations for mean kinetic energy and turbulence energy are viewed in the light of 100 years of subsequent flow research. Attempts to use the Reynolds energy-balance method to calculate the lower critical Reynolds number for pipe and channel flows are reviewed. The modern use of turbulence-energy methods for boundary layer transition modeling is discussed, and a current European Working Group effort to evaluate and develop such methods is described. The possibility of applying these methods to calculate transition in pipe, channel, and sink flows is demonstrated using a one-equation, q-L, turbulence model. Recent work using the equation for the kinetic energy of mean motion to gain understanding of loss production mechanisms in three-dimensional turbulent flows is also discussed.

Kinetic energy distribution of ions in the laser ablation of copper targets

1998 ◽  
Vol 127-129 ◽  
pp. 953-958 ◽  
Author(s):  
S Amoruso ◽  
V Berardi ◽  
R Bruzzese ◽  
N Spinelli ◽  
X Wang
Keyword(s):  
Laser Ablation ◽  
Kinetic Energy ◽  
Energy Distribution ◽  
Kinetic Energy Distribution

scholarly journals Non-thermal laser-induced desorption of metal atoms with bimodal kinetic energy distribution

1996 ◽  
Vol 63 (4) ◽  
pp. 315-320 ◽  
Author(s):  
T. Götz ◽  
M. Bergt ◽  
W. Hoheisel ◽  
F. Träger ◽  
M. Stuke
Keyword(s):  
Kinetic Energy ◽  
Energy Distribution ◽  
Kinetic Energy Distribution ◽  
Metal Atoms
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