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 42 for “"Turbulent transport"”.
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Turbulent transport of inertial aerosols
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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A numerical investigation of collisionality and turbulent transport
An investigation of collisionality's role in turbulent transport in magnetized plasma using the GS2 gyrokinetic simulation software is presented. The investigation consists of three parts, conducted by way of numerical modeling: 1) input calibration using the conditions and results of a reference …
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The applicability of stochastic turbulent transport models in strongly non-homogeneous and non-stationary flows
… of the direct-pdf method for the modeling of turbulent-transport processes inside reciprocating engines. The research can be divided in two phases.
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The design, fabrication, and testing of a wind tunnel for the study of the turbulent transport of aerosols
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Turbulent Angular Momentum Transport in Weakly-Ionized Accretion Disks
… will destabilize a disk and result in a vigorous turbulent transport of angular momentum has revolutionized the field. Much of accretion disk research now focuses on understanding the implications of this mechanism for astrophysical observations. At the same time, the success of this mechanism …
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Fluctuating Velocity-Pressure Field Structure in a Round Jet Turbulent Mixing Region
An experimental study of turbulent mixing has been conducted to provide detailed insight regarding the turbulent transport processes, especially those involving pressure. The investigation was conducted in the mixing region of a 6.35 cm diameter, isothermal, stationary jet having an exit velocity …
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Extension of gyrokinetics to transport time scales
… improved our theoretical understanding of turbulent transport in fusion devices. Most gyrokinetic models in use are [sigma]f simulations in which the slowly varying radial profiles of density and temperature are assumed to be constant for turbulence saturation times, and only the turbulent …
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Experimental data analysis techniques for validation of Tokamak impurity transport simulations
… new techniques for analyzing data from impurity transport experiments in magnetically confined plasmas, with specific applications to the Alcator C-Mod tokamak. The objective in developing these new techniques is to improve the quality of the experimental results used to test simulations of …
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Computational and experimental study of trailing vortices
… in terms of vorticity and stream function. Turbulent transport was modeled through the turbulent kinetic energy and the Prandtl-Kolmogorov hypothesis to give an eddy viscosity. The experimental results showed that the effects of Reynolds number are significant for vortex formation in the …
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Inferring ocean circulation during the Last Glacial Maximum and last deglaciation using data and models
… to constrain the ocean’s role in storing and transporting heat, salt, and other tracers during this time, with implications for understanding how the modern ocean works and how it might change in the future. • By combining a kinematic ocean model with “upstream” and “downstream” deglacial …
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Inferring ocean circulation during the last glacial maximum and last deglaciation using data and models
… to constrain the ocean's role in storing and transporting heat, salt, and other tracers during this time, with implications for understanding how the modem ocean works and how it might change in the future. -- By combining a kinematic ocean model with "upstream" and "downstream" deglacial …
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Numerical modeling and simulation of compressible reacting turbulent shear layers
… modeling and simulation of compressible reacting turbulent shear layers are considered. In the numerical modeling portion of this work, improved turbulent transport models for compressible shear layers are presented and validated with detailed experimental data. The new compressible models are …
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Numerical simulation of mixing processes in two-dimensional channel flows
… in the numerical simulation of laminar and turbulent transport phenomena. More knowledge in this field is needed to improve predictions of heat and mass transfer processes in a variety of technical fields.</p> <p>In this work a new computationally efficient transport model is developed. It …
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Transport processes in a direct numerical simulation of turbulent channel flow
… time-dependent, three-dimensional turbulent flow in a channel is used to investigate turbulent transport processes. Detailed properties of the turbulent velocity field are presented. Three different transport processes are explored using this extensive data base. The first is the …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of suspended sediment, temperature, and salinity induced stratification on the vertical turbulent …
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Experimental study of turbulent heat transport in Alcator C-Mod
The comprehensive analysis was performed to study turbulent transport in Alcator CMod plasmas in this thesis. A new Correlation Electron Cyclotron Emission (CECE) diagnostic was designed and installed as a part of this thesis work. Using this diagnostic, we measured local T fluctuations in r/a >/~ …
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Numerical Modeling of Turbulent Combustion and Flame Spread
… important aspects of numerical modeling of turbulent combustion and flame spread. The developed models include a pyrolysis model for charring and non-charring solid materials, a fast narrow band radiation property evaluation model (FASTNB) and a turbulence model for buoyant flow and flame. …
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Electric fields and transport in optimized stellarators
… minimal flow damping, which may lead to reduced turbulent transport. Quasi-isodynamic plasmas can have vanishing bootstrap current, implying less variation in the magnetic configuration as the pressure changes and also implying greater stability. Analytical expressions for neoclassical transport …
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New mixing-length model for numerical solution of turbulent supersonic flows
… a new parameter S which is introduced in the new turbulent transport formula. The new parameter S acts like an effective turbulent Schmidt Number for mixtures of gases or a turbulent Prandtl Number for a homogeneous gas. The new turbulent model and Prandtl’s original model are both applied to six …
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Experimental investigation of non-uniform flow past propellers
… direction. The results of the mean and turbulent flow under the non-uniform flow condition are documented and discussed in detail. The 3-D non-uniform inflow caused the location of the maximum thrust to be shifted from . 7R, previously found for uniform inflow for the same propeller, to …
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