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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 40 for “"Free surfaces"”.
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Numerical Solutions of Nonlinear Potential Flows With Free Surfaces
Made available in DSpace on 2014-12-14T04:42:01Z (GMT). No. of bitstreams: 1 7708911.pdf: 2205365 bytes, checksum: 4acfe8e0516e97bcd3ac34f83c640efa (MD5) Previous issue date: 1976
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Biolocomotion near free surfaces in Stokes flows : mechanism of swimming and optimization
… a striking ability to "crawl" beneath the free surface. By modeling the foot of the snail as undergoing a simple sinusoidal motion, we apply lubrication approximations for small deformations to rationalize this peculiar mode of transport and its dependency on surface tension. Inspired by …
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An Experimental Investigation of Spanwise Vortices Interacting with Solid and Free Surfaces
… fields due to flow interaction with sharp solid surfaces. Such vortices generate significant disturbances in the flow and affect its further development. In this dissertation attention is focused on the interaction of vortices with solid or free liquid/air surfaces. We examine vortices with their …
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The effect of AC magnetic fields on liquid-metal free surfaces in industrialMHD
In this thesis we investigate free-surface instabilities which occur in various industrial processes involving liquid metal. Specifically, we examine a number of simple problems with a view to developing a plausible theoretical description based on MHD. Of particular interest is the behaviour of …
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Modeling of three-dimensional viscoelastic flows with free surfaces using a finite element method
… creeping flow of a Giesekus fluid with free surfaces at infinite capillary number. The code is an extension of the parallel methods developed by Caola et al. from two- to three-dimensional flows, a restructured and improved version of the three-dimensional code of Phillips based on the …
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Propagation of Leaky Waves in Free Surfaces and Grating Structures on (100)-Cut Gallium-Arsenide
… met by first understanding wave propagation in free-surface GaAs and subsequently exploring a buried bimetallic electrode structure which will present minimum velocity and impedance perturbations to the wave. In this way, the free-surface diffraction theory may be used to accurately describe …
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On the stability of plane viscoelastic shear flows in the limit of infinite Weissenberg and Reynolds numbers
… bounded by walls as well as flows bounded by free surfaces. In the inviscid, nonelastic case all the flows we study are unstable for free surfaces. In the case of wall bounded flow, there are instabilities in the shear layer and Bickley jet flows. In all cases, the effect of elasticity is to …
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Finite element solution of interface and free surface three-dimensional fluid flow problems using flow-condition-based interpolation
… for a highly accurate simulation scheme of free surface flows is emphasized in various industrial and scientific applications. To obtain an accurate response prediction, mass conservation must be satisfied. Due to a continuously moving fluid domain, however, it is a challenge to maintain the …
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Free surface dynamics in shallow turbulent flows.
… aimed to understand the processes that govern free surface behaviour in depth-limited turbulent flows. Experimental data has shown that the turbulence properties at a point near the free surface relate directly to the properties of the free surface pattern. This would suggest a direct linkage …
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Liquid metal brushes for homopolar devices
… with a strong applied magnetic field and with a free surface beyond each moving end of the gap. The radial and axial velocities in the secondary flow are reduced by a strong axial or radial magnetic field. For a sufficiently strong field, the azimuthal momentum transport by the secondary flow can …
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Tensile Stress and Thermal Growth Effects on Grain Boundary Motion in Nanocrystalline Nickel
… in 5 nm3 nc-Ni specimens, half of which contain free surfaces, while the other half have periodic boundary conditions. Grain boundary sliding (GBS) and grain rotation are the deformation mechanisms exhibited by the nc-Ni specimens, in contrast to dislocation-mediated deformation mechanisms found …
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Pulseback cleaning of panel bed filter for treating a liquid
… liquid and granular material was investigated. Free surfaces of quartz sand for the entry of water were provided by vertical support louvers. A pulseback technique was used to rid the liquid entry surface of the sand. The pulseback consisted of a reverse transient flow of liquid across the panel …
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Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus
… in turn have microvilli and microridges on their free surfaces. The highest incidence of macroridges occurs in the expanded yolk sac and pericardial s ac re ions and the epidermal surface area is at its greatest in embryos 6,8mm long. Thereafter the macroridges gradually disappear and the …
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Methods for the direct simulation of nanoscale film breakup and contact angles
… investigates direct simulation of fluids with free surfaces and contact lines, with a focus on capturing nanoscale physics in a continuum based computational framework. Free surfaces and contact lines have long presented some of the most challenging problems in computational fluid dynamics. …
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Atomistic simulation of defect structure in Nb-Ti-Al
… anti-phase boundaries, twins, pseudo-twins, free surfaces and dislocations. An estimation of the ductility of these intermetallics was made using both the Rice and ZCT ductility criteria. Comparison of the criteria with values for other B2 intermetallics leads to the conclusion that the …
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Engineered surfaces for enhanced control of electrochemical bubbles
… a novel approach to rationally design the surfaces of electrochemical electrodes to move towards 'bubble-free' surfaces for a variety of applications..
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Sources of thermally generated vacancies in single-crystal and polycrystalline gold
… For example Barnes (1960) has shown that the free surfaces and grain boundaries in copper are excellent sources of thermally generated vacancies, though he found no definitive evidence for dislocation climb. In view of the existing situation an investigation was undertaken to study vacancy …
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Modelo numérico de efeitos hidrodinâmicos em escoamentos internos e externos
… force is extrapolated to the instantaneous free surface. The time domain method was evaluated in a simple case of a box shape under transversal and longitudinal waves, analyzing the roll, heave and pitch motion amplitudes. The other method was a particles method based on the Euler equations, …
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Computational design of interfaces : mitigating He damage in nuclear fusion applications
… themselves. Thus, channels that terminate at free surfaces may enable controlled He removal via outgassing, thereby averting He-induced damage. In this thesis, computational methods are developed for identifying promising interfaces that give rise to He channels and for modeling He network …
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Ceramic interfaces and their radiation response
… first study examined whether grain boundaries or free surfaces are a more effective defect sink. Free surfaces were observed to be a better defect sink when compared to grain boundaries. The second study examined the effect of radiation on nanoparticles under various radiation temperatures and …
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