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 28 for “"Turbulence kinetic energy"”.
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Reynolds stress measurements downstream of a turbine cascade
… be taken with solution for mean velocities and turbulence quantities by least-squares fitting procedures was developed. This measurement technique was verified in a fully-developed turbulent pipe flow; the results show the accuracy of the probe when used in an end-flow orientation at various …
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Generation of Downstream Vorticity Through the Use of Modified Trailing Edge Configurations
… mixing in the flow will reduce the levels of turbulence kinetic energy observed downstream of the blade trailing edge. Thus, this project seeks to identify which passive techniques of imparting streamwise vorticity are most effective at improving the flow characteristics responsible for some …
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A Basic Three-Dimensional Turbulent Boundary Layer Experiment To Test Second-Moment Closure Models
… showed three dimensionality, but exhibited high turbulence intensities in the outer layer. Profiles off the test section centerline are highly three dimensional with multiple peaks in the normal stress profiles. The flow also reaches a state where all the normal stresses have equal magnitudes …
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The Effects of Free Stream Turbulence on the Flow Field through a Compressor Cascade
… made to reveal the effects of grid generated turbulence on this flow. The data set is unique in that not only does it give a comparison of elevated free stream turbulence effects, but also documents the developing flow through the blade row of a compressor cascade with tip leakage. …
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Numerical Simulation of a Liquid Jet Atomization and Break-Up Using ANSYS-CFX 12.0
… number, JetA Liquid Average Velocity and the turbulence kinetic energy.</p>
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Computations of nonreacting flameholder flows with a zonal grid method
… the flow pattern. The predicted streamlines, the turbulence kinetic energy K, and the reverse mass flow rate are presented.
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An experimental investigation of the turbulent flow in a closed compound channel
… indicating that this might be an area of high turbulence production. The distributions of all Reynolds stresses across the cross-section are reported. The Reynolds stress distributions show peak values near the interface corner region and small values near the center-line and on the axes of …
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Comparative Analysis of Serrated Trailing Edge Designs on Idealized Aircraft Engine Fan Blades for Noise Reduction
… These showed that the mean streamwise velocity, turbulence kinetic energy and turbulence kinetic energy production in the tip leakage region were nearly the same for all four serrated blades as well as the baseline. The vorticity in this region was a more dependent on the serration shape and as a …
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Energetics and similarity theory in the wave-affected atmospheric boundary layer
… of the production and consumption terms of the turbulence kinetic energy (TKE) budget equation using observational data. This data is from two periods, each containing two months of continuous observations collected at the Woods Hole Oceanographic Institution’s (WHOI) Buzzards Bay Air-Sea …
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A turbulence model for steady and unsteady boundary layers in strong pressure gradients
A new turbulence model designed for two-dimensional, steady and unsteady boundary layers in strong adverse pressure gradients is described. The model is developed in a rational way based on an understanding of the flow physics obtained from recent experimental observations. The turbulent shear …
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The numerical analysis of turbulent flow around off-shore structures
… The predictions were made using a two-equation turbulence model, solving transport equations for turbulence kinetic energy K and the turbulence dissipation rate ε, in addition to the partial differential equations for the conservation of mass and momentum. The program used was the well tested …
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Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
… also increases the velocity up to 47.7% and turbulence kinetic energy up to 62.4% in the mixing chamber. In comparison between MCJ plate (P5) and swirl, P5 produces 33.8% lower backpressure but produces higher flame temperature at 4.3%. The result indicates that the MCJ plates are more …
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A Novel Multiblock Immersed Boundary Method Enabling High Order Large Eddy Simulation Of Pathological And Medical Device Hemodynamics
… order numerics together with a scale resolving turbulence model such as large eddy simulation (LES). This in turn limits one to use a structured fluid flow solver on which complex, branching arterial domains that are typical in the human blood circulatory system could not be handled. To overcome …
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Trait-based approaches to marine microbial ecology
… Chapter 4, I investigated how small-scale fluid turbulence affects phytoplankton nutrient uptake rates and community structure in an idealized resource competition model. The flux of nutrients to the cell and nutrient uptake are enhanced by turbulence, particularly for big cells in turbulent …
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Data Analysis of an Unsteady Cavitating Flow on a Venturi-type Profile
… from the instabilities suggests a transfer of energy from the largest scales, fluctuating mean flow, to the smaller scales such as cloud cavitation and Kelvin-Helmholtz (KH) instability. It is demonstrated that the POD decorrelation of length scales yields inherently quasi-periodic time …
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Near-inertial internal Poincare waves in Lake Michigan: Seasonal variability and effects on lateral dispersion and turbulent mixing
… internal Poincaré waves is not only an energy source for vertical mixing in the thermocline and mixed layer, but also enhances horizontal dispersion via an unsteady shear flow dispersion mechanism. The Poincaré waves are found to enhance greatly lateral dispersion for times less than the …
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Jet Noise Control by Adjoint-Based Optimization
… terms (body forces, mass sources, and internal energy sources) with compact support near the ""splitter plate."" The noise to be reduced is defined by a space-time integral of the mean square pressure fluctuations on a line parallel to the mixing layer in the acoustic field of the low-speed …
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Finite element solution of the Navier-Stokes equations for 3-D turbulent free shear flows
A half-equation model of turbulence has been developed to described the eddy viscosity distribution of two and three-dimensional turbulent free shear flows. The model is derived by integrating the parabolized transport equation for the turbulence kinetic energy over the cross section of the flow. …
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… flow. The presence of bubbles also increases the turbulence level. The global structure of the flow proved to be sensitive to the void fraction. The present RANS simulations predict this behavior, but different turbulence models give different spreading rates. There is a significant difference in …
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Direct numerical simulation of droplet-laden isotropic turbulence
Interaction of liquid droplets with turbulence is important in numerous applications ranging from rain formation to oil spills to spray combustion. The physical mechanisms of droplet-turbulence interaction are largely unknown, especially when compared to that of solid particles. Compared to solid …
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