Search results for "velocity profiles."

showing 3 items of 3 documents

Large Eddy Simulations of Rough Turbulent Channel Flows Bounded by Irregular Roughness: Advances Toward a Universal Roughness Correlation

2020

The downward shift of the mean velocity profile in the logarithmic region, known as roughness function, $$\Delta U^+$$ , is the major macroscopic effect of roughness in wall bounded flows. This speed decrease, which is strictly linked to the friction Reynolds number and the geometrical properties which define the roughness pattern such as roughness height, density, shape parameters, has been deeply investigated in the past decades. Among the geometrical parameters, the effective slope (ES) seems to be suitable to estimate the roughness function at fixed friction Reynolds number, Re $$_{\tau }$$ . In the present work, the effects of several geometrical parameters on the roughness function, i…

FrictionLogarithmGeneral Chemical EngineeringGeometryGeneral Physics and AstronomyTurbulent channel flows Large eddy simulation02 engineering and technologySurface finishMacroscopic effects01 natural sciencesReynolds numberSettore ICAR/01 - Idraulica010305 fluids & plasmasRoot mean squaresymbols.namesakeSinusoidal functions0203 mechanical engineering0103 physical sciencesPhysical and Theoretical ChemistryChannel flowEffective slopePhysicsRoughness correlationTurbulenceMathematical analysisReynolds numberTexturesMean velocity profilesRoughnessOpen-channel flowWall flow Geometrical property020303 mechanical engineering & transportsAmplitudeLESLogarithmic regionsMean absolute deviationssymbolsLarge eddy simulationFlow, Turbulence and Combustion
researchProduct

Flow Resistance in Step-Pool Rills

2017

Rills evolve morphologically, and the adjustment of rill channel geometry to flow affects the relationships among velocity, discharge, and slope. The resistance to flow in step-pool rills is mainly due to form-induced mechanisms and, in comparison, grain resistance is of minor significance. Previous studies on rill flow resistance have been performed exclusively for grainresistance conditions and use a stream flow equation. In this study, a new flow resistance equation, deduced by applying dimensional analysis and self-similarity theory, was applied to rill flow in step-pool channels. First, the incomplete self-similarity hypothesis was used for establishing a power flow velocity profile wh…

Flow resistanceMorphology (linguistics)010504 meteorology & atmospheric sciences0208 environmental biotechnologySoil Science02 engineering and technologySTREAMSMechanics01 natural sciences020801 environmental engineeringFlow (mathematics)Dimensional analysis Flow resistance equations Friction factors Resistance equations Self-similarities Theoretical approach Theoretical expression Velocity profilesStream flowSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeology0105 earth and related environmental sciencesVadose Zone Journal
researchProduct

ADCP velocity profiles analisys in the Castellammare gulf

2009

Velocity profiles have been collected in three points within the Castellammare gulf at around 1500 m far from the coastline. This area is characterized by the presence of an aquaculture farm that positioned 5 floating cages in this zone. The impact of this activity on the environment strictly depends on the currents and water exchange. The general aim of this research is the characterization of the circulation characteristics of this area. The analysis of the free surface oscillations shows the typical behaviour of tide forcing, with high minima and maxima during the night, due to the higher moon attraction during these hours compared with the morning hours. A prevalent current direction fr…

Coastal measuregulf currentAcoustic Doppler ProfileSicilyvelocity profiles.
researchProduct