Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 188 for “"mean velocity"”.
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Mean velocity and turbulence measurements of flow around a 6:1 prolate spheroid
… and near wake regions along the leeward side. Mean velocity flow field measurements, at α = 10∘ and 15∘ , and at Re = 1.3 x 10⁶ (U<sub>re</sub>= 15.2 mls) and 4.0x 10⁶ (Ure=45.7 m/s), were obtained at four axial locations along the afterbody. Boundary layer profiles and Reynolds shear stress …
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Conditionally Analyzed Mean Velocity and Turbulence Measurements in a Plume-Induced Boundary Layer Separated Flowfield
The shock-induced separation process was found to dramatically increase the streamwise and transverse Reynolds normal stresses (which both peak near reattachment), the primary shear stress, and the normal stress anisotropy. The shock-separated shear layer consists of only a single layer with a …
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Energy transfer from wind to waves
… from the Phillips model, for which the mean velocity profile over water surface is important. The analytical model of Phillips using logarithmic form of the mean velocity profile has not been successful. In the present study, two different mean velocity profile models have been used. One …
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A three-dimensional turbulent boundary layer upstream and around a junction vortex flow
… of wall static pressure, wall shear stress, mean velocity, and Reynolds stress tensor field are reported at several stations in the three-dimensional turbulent boundary layer region. Documentation of the flow edge conditions is provided as well as upstream initial conditions along a plane …
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An experimental investigation of the turbulent flow in a closed compound channel
… made for a single channel Reynolds number. All mean velocity components were calculated and are reported. The mean velocity field results are in good agreement with results reported for similar geometries. The vector plots and the axial vorticity distribution reveal the existence of secondary …
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Experiments on turbulent flows in rough pipes: spectral scaling laws and the spectral link
… energy spectra and the attendant turbulent mean velocity profile in a pipe flow, we establish new scaling laws for the turbulent energy spectra of pipe flows. These new scaling laws— an inner scaling law and an outer scaling law—differ from the scaling laws that were predicated on Townsend’s …
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An experimental study of a three-dimensional pressure-driven turbulent boundary layer
… sitting on a flat plate. The nominal reference velocity of the flow is 27 m/sec and the Reynolds number based on the momentum thickness at 0.75 chord upstream of the body on the centerline of the tunnel is ≃ 5936. The data presented include time-mean static pressure, skin friction magnitude and …
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Effects of surface roughness on the flow characteristics in a turbulent boundary layer
… applications that require understanding of the mean velocity and turbulence in the immediate vicinity of the roughness elements. This thesis reports the effects of surface roughness on the flow characteristics in a turbulent boundary layer. Both experimental and numerical investigations are used …
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Computational Analysis of Internal Coral Hydrodynamics
… physiological processes depend on the local velocity field, local concentration gradients of nutrients and waste, and the turbulent stresses developed on and above the coral surface. Though the large-scale hydrodynamics over coral reefs are well studied, the interior hydrodynamics, between …
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The diode array velocimeter
… laser beam for its probe. The DAV measures velocity within a seeded, transparent medium by timing the passage of a seed particle’s image across an array of PIN photodiodes. This prototype device can measure one component of mean velocity as well as one component of time-averaged turbulence …
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Point Doppler velocimetry measurements in circular jets
… accuracy and repeatability and to reduce mean velocity offset. Most importantly, the original iodine cells have been replaced by vapor-limited iodine cells that are not influenced by room temperature variations. PDV is a non-intrusive laser based flow measurement technique with …
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The Effects of Curvature on Turbulent Boundary Layers Over a 3D Bump Geometry: An Experimental Study Using BeVERLI Hill
… characteristics. The study examines the mean velocity, Reynolds shear stresses, pressure gradient, turbulence intensity, and pressure coefficient variations in relation to the bump curvature. The results are consistent with prior studies on the destabilizing influence of concave curvature …
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Measurements of the structure of urban-type boundary layers
… over the cube surface. It was found that mean velocity variation in the span at a height of 50% of the boundary layer thickness could exceed ±5%. Further testing was conducted at locations far enough downstream to minimise the amplitude of the variation. Time-averaged mean velocity and …
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A Model Study of the Hydraulics Related to Fish Passage Through Embedded Culverts
… conditions, which included flow depths and velocity distributions, for at-grade and embedded culverts. A physical hydraulic model study was conducted in the Hydrotechnical Laboratory of the Department of Civil and Geological Engineering at the University of Saskatchewan. A culvert with a …
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Modeling of flow in impeller stirred tanks using computational fluids dynamics
… the predicted turbulent quantities than on the mean velocity components. For the mean velocity components, reasonable agreement with the experimental data was observed even on relatively coarse grids. The choice of discretization scheme was found to have significant effect on the predicted …
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Agricultural spray droplet dispersion in turbulent windflow
… as matching the full-scale logarithmic man velocity profile with suitable surface roughness parameters. A general calculation scheme is presented for spacing horizontal flat plates to simulate weakly-sheared mean velocity profiles. Adequate full-scale matching of logarithmic mean velocity …
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Near-wall similarity in two- and three-dimensional turbulent boundary layers
Static pressure, mean velocity, indirect wall shear from Preston tubes, direct wall shear using a two-dimensional (single line of action) floating element device, and direct wall shear measurements from an omnidirectional floating element capable of simultaneously determining magnitude and …
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Statistical Stability and Fast Transient Growth in Wall-Bounded Turbulence
… their interactions rely on the knowledge of the mean velocity profile and include linear models such as modal stability analysis and transient growth calculation. With a purpose to better the understanding of the relationship between the mean flow and the background turbulence structures, this …
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Nonlinear wave interactions in supersonic wind generated waves
… a model that accounts for the viscosity and the mean velocity profiles of the liquid and the gas, body forces, surface tension, compressibility and thermal conductivity of the gas, and nonlinear effects. The main achievement of the present study is an improved method for analyzing wave stability …
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A virtual flow meter to develop velocity-index ratings and evaluate the effect of flow disturbances on these ratings
… a stage-discharge rating is not unique and a velocity-index rating is often developed. A velocity-index rating relates the mean velocity of the channel and an index-velocity calculated by averaging velocities measured at defined locations and sampling intervals. The application of velocity …
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