[PDF] Top 20 On Coherent Structures of Turbulent Open-channel Flow Above a Rough Bed

On Coherent Structures of Turbulent Open-channel Flow Above a Rough Bed

... sweep and ejection events [15, 16]. In early 2000s, following studies indicated that sweep and ejection events are part of a larger coherent structures which could be called hairpin vortex [11, 17]. In ... See full document

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Smooth and Rough Wall Open Channel Flow Including Effects of Seepage and Ice Cover

... seepage flow through boundaries due to the difference between water levels in the channel and the adjoining ground-water ...the channel is higher than the adjoining ground-water level, seepage ... See full document

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Numerical simulation of flow over a rough bed

... 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 ... See full document

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SPH modelling of depth-limited turbulent open channel flows over rough boundaries

... the rough bed boundary is another important influence factor ...the turbulent stress which is mainly due to the spatial filtering has been lost by the standard eddy- viscosity model (with Smagorinsky ... See full document

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Analysis of Flow Resistance for Different Bed Materials with Varying Discharge Experimentally in Open Channels

... different bed roughness in open channel ...measured bed roughness in natural channels. In 2002 Yen B. C. found that the flow in open channel is effected by the wall ... See full document

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Incompressible SPH simulation of open channel flow over smooth bed

... the above analysis, the ISPH computed velocity profiles for three different flow depths are fitted to the semi-analytical results for the rough bed turbulent flows (Cheng, 2007) in ... See full document

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SPHysics simulation of laboratory shallow free surface turbulent flows over a rough bed

... of turbulent shallow open channel flow is never completely flat, since it is disturbed by the underlying turbulent flow structures and advecting capillary-gravity ... See full document

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Turbulent structures in smooth and rough open channel flows: effect of depth

... backward flow which represents the ejection event (labeled Q2) and a forward flow with positive streamwise fluctuations being moved towards the wall which represents the sweep event (labeled ...sweeps ... See full document

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Doppler spectra of airborne ultrasound forward scattered by the rough surface of open channel turbulent water flows

... the rough dynamic surface of an open channel turbulent ...the flow near the ...in open channel turbulent flows over a rough bed is ...of open ... See full document

14

The Experimental and Numerical Approch of Two- phase Flows by a Wall Jets on Rough Beds in Open Channel Flow

... simulating flow through a river. They included the large-scale bed roughness using a boundary-fitted mesh and also used a two-point wall function ...the flow moved from the smoother sand bed ... See full document

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FLOW CHARACTERISTICS AND TURBULENT STRUCTURE BEHIND OF MULTI VENTS WATER STRUCTURES IN THE EXPANSION ZONE IN SLOPING CHANNEL

... The experiments were carried out in a rectangular open channel that is 8.0m long, 0.3m width and 0.5m height with glass wall 6 mm thick and a steel plate bed Fig.1 shows layout of the test facility. ... See full document

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Computational fluid dynamics in the assessment of patients' postoperative status after glottis-widening surgery

... Material and methods. Surface measurements of the glottic space were made during maximum ad- duction of the vocal folds. Additionally, the following spirometric parameters were determined: forced vital capacity (FVC), ... See full document

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Investigating mode competition and three-dimensional features from two-dimensional velocity fields in an open cavity flow by modal decompositions

... driven open cavity flows are known to exhibit strong self-sustained os- cillations of the ...incompressible open cavity flow, in a regime of mode ...the flow, it fails at identifying the ... See full document

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Modelling of Bed Roughness with variations in Flow Parameters

... The Flow Resistance In A Flume With Artificial Emergent Vegetation”, Larhyss Journal, ISSN 1112-3680, ...Using Flow Measurements Collected in Vegetated Waterways”, Open Journal of Modern Hydrology, ... See full document

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Influence of bed roughness in open channel

... by bed roughness. Besides, influence of bed roughness has more effect at steeper slope, although the study was done in ...smooth bed surface also affects the differences between Q theory and Q ... See full document

6

Two Point Statistics of Coherent Structure in Turbulent Flow

... the coherent structures (CS) based on two-point correlations and their applications, with a focus on the interpretation of sta- tistic CS and their ...in turbulent flow. The CS is one of ... See full document

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Wavelet analysis of the turbulent flow over the very rough surface

... that structures evolves within the transition from a laminar to a turbulent flow due to a presence of an instability ...The structures are created thanks to a tiny three-dimensional ... See full document

9

Coherent structures in the breakdown bubble of a vortex flow

... Helical structures downstream of the breakdown-bubble of the Grabowski vortex profile at Reynolds numbers Re ≤ 500 have been extensively studied through stability analysis in the ...low-frequency coherent ... See full document

17

Particle-Interaction Effects in Turbulent Channel Flow

... for turbulent channel flows particle positions close to a wall correlate with instantaneous regions of low velocity along the streamwise direction, avoiding regions of high velocity, with the former defined ... See full document

7

Large eddy simulation of turbulent flow over a rough surface

... separated. Above the height z/D = ...linear above Z/D = ...the turbulent intensities at z/D = 0.8 are not small. We consider the flow below ... See full document

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