Flow structure and bed deformation around a sphere on movable bed

2014 ◽  
pp. 1499-1507 ◽  
Author(s):  
A Tominaga
Keyword(s):  
Flow Structure ◽  
Bed Deformation ◽  
Movable Bed

Étude des efforts hydrodynamiques sur un fond mobile en aval d'un dissipateur d'énergie de type auge

2005 ◽  
Vol 32 (2) ◽  
pp. 400-412
Author(s):  
A El Amri ◽  
J -L Verrette
Keyword(s):  
Pressure Fluctuation ◽  
Initial Phase ◽  
Solid Model ◽  
Bed Deformation ◽  
Measuring Devices ◽  
Energy Dissipater ◽  
Specific Behaviour ◽  
Movable Bed ◽  
Fluctuation Energy

The continuous scour of an erodible bed downstream a roller bucket energy dissipater makes it difficult to quantify the efforts applied on the bed. An astute technique allows the measurement of these efforts for various stages of scour and facilitates a better comprehension of the interaction between these efforts and the scour downstream. This technique consists in measuring the bed profile (downstream the dissipater) as a function of time and reproducing scoured profiles using a solid model (concrete) that allows the setting of the measuring devices. The analysis of the efforts has shown that as soon as the scour starts, a small bed deformation induces important changes in the pressure and in the pressure fluctuation distributions in the vicinity of the structure. As erosion goes on, the efforts vary slightly and the distributions remain unchanged. The behaviour of the efforts regarding the erosive process could be interpreted by the nature of scour phenomenon, which develops strongly during the initial phase, and by the specific behaviour of the zone in the vicinity of the bucket, which evolves rapidly and stabilizes quickly.Key words: hydrodynamic efforts, pressure, pressure fluctuation, energy dissipater, roller bucket, movable bed.

Similarity Laws of Distorted Model with a Movable Bed and its Validity

2011 ◽  
Vol 383-390 ◽  
pp. 4413-4423
Author(s):  
Bing Qian Wei ◽  
Hong Yun Xun ◽  
Rong Ge Xiao ◽  
Wen Qiang Meng
Keyword(s):  
Bed Load ◽  
Bed Deformation ◽  
Deformation Equation ◽  
Bed Form ◽  
Load Transport ◽  
Bed Load Transport ◽  
Dimensional Equation ◽  
Movable Bed ◽  
Distorted Model ◽  
Similarity Laws

The theoretical backing of the similarity laws obtained from dual dimensionless parameters of the bed-form classification diagram is given by solving the equations of similarity conditions which is obtained from 1-Dimensional equation of motion, continuity equation, bed deformation equation and the formula of bed load transport. Secondly, the validity of the similarity laws is confirmed by comparing the bed form of distorted model experiment with that of undistorted model experiments performed by Hokkaido Development Bureau (H.D.B.). And also the fact that the height of bar in a gentle curved river channel can be estimated by the result of distorted model of straight flume is found.

FLOW STRUCTURE AND HEAT TRANSFER IN MULTIPLE IMPINGING JETS

2016 ◽  
Vol 47 (4) ◽  
pp. 359-382 ◽  
Author(s):  
Nabil Kharoua ◽  
Lyes Khezzar ◽  
Zoubir Nemouchi
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Impinging Jets
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