[PDF] Top 20 Turbulent structures in smooth and rough open channel flows: effect of depth

... on open channel flow turbulence has been conducted intensively only since the 1970s because of the development of the velocity measurement techniques such as hot-film anemometry, laser Doppler velocimetry ... See full document

... with smooth and rough ...the rough marble ...stress, turbulent intensities and Reynolds shear stress were also considered in their ...the depth of ...the channel was 10 ... See full document

... the channel and the adjoining ground-water ...the channel is higher than the adjoining ground-water level, seepage flow is called ...the channel is lower than the adjoining ground-water level, ... See full document

... of turbulent flow over the rough bed of an open ...the channel bed. The depth of flow has been taken as four times the diameter of the spheres and the Reynolds number has been chosen so ... See full document

... a turbulent channel flow act to resist the motion of a fluid is the central concern of fluvial ...flow structures in a variety of fluvial processes [Adrian and Marusic, 2012; Venditti et ...the ... See full document

... the rough bed turbulent flows (Cheng, 2007) in ...the smooth and rough bed turbulent flow velocity profiles can be reflected by the index m in ...more rough bed condition ... See full document

... the effect of viscous forces relative to inertial forces acting on a ...is turbulent . A turbulent flow is characterised by irregularities or disturbances, which lead to the formation of eddies, ... See full document

... for smooth and rough surfaces, ...uniform open channel flow data reported by Roussinova et ...examined effect of the channel aspect ratio on different smooth open ... See full document

... which the air–water interface was located, i.e. when the logical pixel value changed from zero to unity. Fourthly, a 31-pixel wide median filter was applied to remove small fluctuations associated with noise generated by ... See full document

... flow structures in order to obtain better representation of the streamwise flow velocity and shear stress profiles even using a particle resolution that is lower than the actual turbulence ...the channel ... See full document

... end depth ratio as ...of open channel to study the effect of slope and ...rectangular channel for various slopes and bed ...of channel slope and the second requiring both ... See full document

... and turbulent flows are in a good agreement with that of the original 2-D advection-diffusion ...maximum depth-averaged concentra- tion along the ...maximum depth-averaged concentration for ... See full document

... the effect of roughness transition in wall-bounded flows is attributed to Antonia and Luxton [3, ...of rough-smooth and smooth-rough wall transition, using Preston tube ... See full document

... between smooth and rough surface conditions, hence taking advantage of the fact that the wall model operates point-wise across wall surfaces, and so changes in the outer flow can be viewed as a natural ... See full document

... the depth due to the fact that the predicted and measured gradients have different signs near the water ...of turbulent eddies is signi fi - cantly restricted by the ... See full document

... examines turbulent structures of a rough bed open-channel flow in the context of deterministic ...for smooth-bed boundary ...the smooth and rough-bed layer ... See full document

... river flows around the world are turbulent and the channel beds are often composed of large-scale, potentially mobile, rough elements such as sand and gravel particles, the study of ... See full document

... 1995; Sreenivasan and Antonia, 1997), in this century, it is however established that the applications of the phenomenological theory provide a simple, but scientific, framework to seek the scaling laws of rough ... See full document

... In the flow condition where the mean surface velocity was slower than 0.23 m/s, the free surface was dominated by patterns moving at a velocity close to the mean surface velocity. These patterns may be explained by the ... See full document

... of turbulent flows in computational fluid ...simulationof turbulent flows have also progressed ...of turbulent flow in rivers is less developed and mostlystays on the level of ... See full document