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 46 for “"scalings"”.
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Characterization of a turbulence bifurcation underlying L-mode confinement transitions on Alcator C-Mod
Empirical energy confinement scalings play a crucial role in the design of tokamak fusion reactors, measuring how quickly energy is transported by turbulence from the fusion-producing core to conduction loss at the edge. Unfortunately, experiments often exhibit discontinuous changes in scaling …
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Fluid Dynamics and Surface Pressure Fluctuations of Two-Dimensional Turbulent Boundary Layers Over Densely Distributed Surface Roughness
… experimental uncertainty. Traditional inner wall scalings, outer wall scalings, and roughness scalings were not able to collapse surface pressure fluctuation spectra for the various rough wall surfaces tested. However, the data do collapse for individual geometries based on Reynolds number. This …
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Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum
… From the results, the inner and outer variable scalings were unable to collapse the noise generated by all velocities and roughness sizes. The changing spectral shapes of noise generated by rough surfaces with significantly varying wavenumber spectra make it impossible to scale the produced …
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Residual overturning circulation and its connection to Southern Ocean dynamics
… show that the basin width, in combination with scalings for the overturning circulation make the overturning relatively weaker in the wider basin, priming it for a convection shut down.
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Keller-Segel-Type Models and Kinetic Equations for Interacting Particles: Long-Time Asymptotic Analysis
… of the initial models are preserved via these scalings. Firstly, we consider two scaling approaches (parabolic and grazing collision limits) that can be used to reduce a class of non-local kinetic 1D and 2D models to simpler models existing in the literature. Secondly, we investigate how some …
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High level thermochemical and spectroscopic computations for molecules relevant to combustion and the atmosphere
… numerous individual calculations whose cost and scalings vary widely. Conducting such tedious procedures manually can easily introduce errors. Here, a multifunctional code called EXATHERM was developed. A first generation with fixed procedures was implemented as a proof of principle and then a …
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Concentrated Gauss Curvature in Shape-Programmed Shells
… of conical shells, exhibiting unexpected scalings and holding broad implications within and beyond shape programming.
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Pressure Fluctuations in a High-Reynolds-Number Turbulent Boundary Layer over Rough Surfaces of Different Configurations
… the mean boundary layer velocity. Both these scalings appear more robust than the previously proposed scalings for the low frequency region and are able to scale the pressure spectra of all the data to within 3.5-dB. In addition, it was proven that the high frequency shear friction velocity …
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Heating of solid matter via laser generated electrons
… In the first investigation, simple analytical scalings of target temperatures with laser-target parameters, I L , λ L , n i , produced by the Spitzer resistivity and a prescriptive low temperature for Ohmic heating were compared using a 3D Hybrid-PIC code. Results showed that the scalings from …
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Spacetime damage-based cohesive model for elastodynamic fracture with dynamic contact
… The analysis demonstrates that the velocity scalings implied by the spatial and temporal coordinate scalings and by the scalings of the material properties must be identical to obtain a self-similar scaling of an elastodynamic process. The use of differential forms reveals intrinsic structure …
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Numerical simulation of fluid flow through porous media using the immersed boundary method
… collapses onto the monodisperse data with proper scalings, and the monodisperse data can be then fitted with a universal prediction curve. The effect of the Reynolds numbers in the inertial flow regime has also been studied. The inertial effect at moderate Reynolds numbers can be correlated …
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Linear and nonlinear stratified spindown over sloping topography
… which leads to the formation of a jet. Scalings are presented for the upwelling strength, the length scale over which it occurs, and the timescale for jet formation. The results are applied to the Middle Atlantic Bight shelfbreak.
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Linear and nonlinear stratified spindown over sloping topography
… which leads to the formation of a jet. Scalings are presented for the upwelling strength, the length scale over which it occurs, and the timescale for jet formation. The results are applied to the Middle Atlantic Bight shelfbreak.
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Wheel design optimization for locomotion in granular beds using resistive force theory
… locomotors in the same granular media. These scalings are experimentally confirmed with wheel pairs of various shapes and sizes under many driving conditions in a common sand bed. How the relations may be derived alternatively by assuming Coulombic yielding and how the relations can be …
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Coronal magnetic energy release by current sheet reconnection
… forms develop from general initial conditions. Scalings with resistivity of the associated current structures are also investigated. Most of the analytic work so far has revolved around single null magnetic configurations. Chapter 6 focuses on reconnection solutions in the presence of multiple …
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Shortest paths, Markov chains, matrix scaling and beyond : improved algorithms through the lens of continuous optimization
… running times. In particular, if the optimal scalings/balancings have polynomially bounded condition numbers, our algorithms run in nearly-linear time. Beyond that, we leverage and extend tools from convex geometry in order to design an algorithm for online pricing with nearly-optimal regret. …
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Faster algorithms for matrix scaling and balancing via convex optimization
… largest and the smallest entries of the optimal scalings. This implies that our algorithms run in nearly-linear time whenever K is quasi-polynomial, which includes, in particular, the case of strictly positive matrices. We complement our results by providing a separate algorithm that uses an …
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When an eddy encounters shelf-slope topography
… their vertical structures are rationalized and scalings derived for their cross-isobath scales; for example, the extent to which the eddy influences the shelf. A recipe for estimating cross-isobath transports based on eddy surface properties is put forward. Finally, the findings are tested …
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Magneto-centrifugal Wind with Applications to Astrophysical Accretion Disks
… flow returned to the wind at order 0.01. Radial scalings in a constant Q disk are worked out.
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Shear flow instabilities in viscoelastic fluids
… is close to the center-line. We analyse the scalings and show that it results from a change in the boundary layer structure of the Couette instability. The growth rates can be large, and the wavespeed can be faster than the base flow advection. We are unable to simplify the equations …
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