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 137 for “"Turbulent kinetic energy"”.
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Assessment of RANS Turbulence Models for Hypersonic Flat Plates
… interest examined include velocity, temperature, turbulent kinetic energy, modeled turbulent kinetic energy budget terms, eddy viscosity, Reynolds stresses, heat fluxes, wall skin friction, wall heat transfer, and Reynolds analogy factor. Generally, the SA model performs better than the SST model …
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Near Wall Behavior of Vortical Flow around the Tip of an Axial Pump Rotor Blade
… from an experimental study of three-dimensional turbulent tip gap flow in a linear cascade wind tunnel with 3.3% chord tip clearance with and without moving endwall simulation. Experimental measurements have been completed in Virginia Tech low speed linear cascade wind tunnel. A 24" access …
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Geometry modification effects on a junction vortex flow
… the spatial distribution of the fluctuating flow turbulent kinetic energy. The distribution was integrated to give a measure of the turbulent kinetic energy content of the flow region where the largest fluctuations were seen in real-time smoke visualizations. The wire signal was also used for …
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Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
… (CBLAST-Low). Observations were made of turbulent fluxes, turbulent kinetic energy, and the length scales of flux-carrying and energy-containing eddies in the ocean surface boundary layer. A new technique was developed to separate wave and turbulent motions spectrally, using ideas for …
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Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
… (CBLAST-Low). Observations were made of turbulent fluxes, turbulent kinetic energy, and the length scales of flux-carrying and energy-containing eddies in the ocean surface boundary layer. A new technique was developed to separate wave and turbulent motions spectrally, using ideas for …
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Cross-plane stereo-PIV measurements of a turbulent boundary layer over highly irregular roughness
The characteristics of a turbulent boundary layer overlying a complex roughness topography were explored with stereo particle-image velocimetry measurements in the wall-normal--spanwise plane. The roughness under consideration was replicated from a turbine blade damaged by deposition of foreign …
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Oceanic mixed layer entrainment zone dynamics
… The role of entrainment shear production of turbulent kinetic energy is investigated by comparing model results that include the new entrainment zone with observations at Ocean Weather Station Papa in the North Pacific and with model predictions that do not include the new entrainment zone …
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LES of pulsatile flow in the models of arterial stenosis and aneurysm
… channel to gain insight of the transition-to-turbulent blood flow due to the arterial stenosis and aneurysm. In the stenosed model, a cosine shape stenosis is placed at the upper wall of a 3D channel which reduces the cross-sectional area, whereas the aneurysm which is also placed at the upper …
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An Experimental Investigation Into the Effect of Plasma on the Flow Features of an Axisymmetric Jet
The plasma did influence the mean and turbulent velocity profiles of the jets tested - allowing the jet core to penetrate further downstream. Large scale structure tracking indicated an increase in convective velocity of up to 5%. Heating of the shear layer by the plasma field was believed to bias …
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The computer modelling and experimental study of confined jet mixing with application to jet pump design
… analysis, a theoretical investigation on turbulent confined jet mixing in a non-uniform axisymmetric duct typically used in jet pumps and ejectors has been undertaken. A so-called Prandtl-Kolmogorov two-equation turbulence model, with turbulent kinetic energy k and turbulent energy …
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Experimental and numerical investigations of the off-design flow physics in a supersonic through-flow fan cascade
The turbulent character of the supersonic wake of a linear cascade of fan airfoils has been studied experimentally using a two-component Laser Doppler Anemometer. The cascade was tested in the Virginia Polytechnic Institute and State University intermittent wind tunnel facility, where the …
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Mechanisms of turbulent mixing in the Continental Shelf bottom boundary layer
… water flows. In this thesis, the problem of turbulent mixing in the coastal bottom boundary layer is investigated with a unique set of field measurements of velocity and sound speed that span a significant fraction of the boundary layer obtained over a six-week long period in the late summer …
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Mechanisms of turbulent mixing in the Continental Shelf bottom boundary layer
… water flows. In this thesis, the problem of turbulent mixing in the coastal bottom boundary layer is investigated with a unique set of field measurements of velocity and sound speed that span a significant fraction of the boundary layer obtained over a six-week long period in the late summer …
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Design and Simulation of a Towed Underwater Vehicle
… of velocity can be used to compute the turbulent kinetic energy dissipation rate. Fluid velocity can be measured using a five-beam acoustic Doppler current profiler (VADCP). The VADCP needs to maintain a tilt-free attitude so the turbulent kinetic energy dissipation rate can be …
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Mixed convection in laminar/turbulent separated backward-facing step flows
… transfer results for two-dimensional laminar/turbulent flow in a duct with a backward-facing step are reported. The two walls forming the duct are maintained at uniform but different temperatures. The straight wall is maintained at the inlet air temperature, while the downstream section of the …
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Computation of Reynolds stresses in axisymmetric vortices and jets using a second order closure model
… results show that the vortex core is free from turbulent shear stresses. The turbulent kinetic energy is also found to be relatively weak within the core region. The overshoot of the circulation is found to be 5% of the circulation at infinity over a wide range of Reynolds numbers. The effects …
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Modeling of Compressibility Effects in Turbulent Boundary Layers
… approach, extended incompressible models for the turbulent kinetic energy equation and the Reynolds stress transport equation were derived. It was found that most of the thermal compressibility effects are due directly to density fluctuations. The only exceptions are the thermal contribution to …
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Direct Numerical Simulation of Turbulence in a Model Solid Rocket Motor
… transport and dissipation in the resolved scale turbulent kinetic energy equation are similar to those observed in turbulent channel flows.
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Prediction of the hydrodynamics in stirred tank reactors
… which includes the mean velocities and the turbulent kinetic energy. The analysis also involves ascertaining the stability of the model via the moment convergence approach.
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Velocity moment analysis on oscillatory flow above self-formed vortex ripples
… mean velocities, root-mean-square speeds, turbulent kinetic energy, Reynolds shear stress, and higher order velocity moments including skewness factors, flatness factors, and turbulent diffusion factors were studied for nine different Reynolds numbers. The study on phase-averaged skewness …
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