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 11 of 11 for “"Ring dynamics"”.
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Ring Dynamics in the Western Gulf of Mexico
… interaction of a recently-formed Loop Current ring and a fossil ring is studied using observations and a two-layered eddy-resolving general circulation model of the Gulf of Mexico. This interaction is investigated by following the evolution of volume, energy, potential vorticity, angular …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… engine friction reduction. Piston and piston rings contribute approximately half of the total engine friction and are therefore central to friction reduction efforts. The most common method to reduce mechanical losses from piston rings has been to lower ring tension, the normal force providing …
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Study of Vortex Ring Dynamics in the Nonlinear Schrödinger Equation Utilizing GPU-Accelerated High-Order Compact Numerical Integrators
<p>We numerically study the dynamics and interactions of vortex rings in the nonlinear Schrödinger equation (NLSE). Single ring dynamics for both bright and dark vortex rings are explored including their traverse velocity, stability, and perturbations resulting in quadrupole oscillations. …
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A coupled model for ring dynamics, gas flow, and oil flow through the ring grooves in IC engines
Oil flows through ring/groove interface play a critical role in oil transport among different regions the piston ring pack of internal combustion engines. This thesis work is intended to improve the understanding and modeling capability on this important oil transport mechanism for better analysis …
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Fast modeling of multi-phase mixture transport in piston/ring/liner system via GAN-augmented progressive modeling
… mechanical and physical processes including ring dynamics, gas flow, oil redistribution and multi-phase transport to paint a detailed picture of the global lubrication environment in the piston/ring/liner system. The main contributions of this thesis can be summarized as the following: 1) …
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Experimental Investigation of the Blowby Effect on the Three-Piece Oil Control Ring and Subsequent Oil Transport in Transient Engine Working Conditions
… well as deteriorate the aftertreatment system. During transient engine operations, an increase of OE can be introduced but some of the mechanisms remained unclear. Thus, a throughout understanding of oil transport in the ring pack is needed to improve engine design. In this work, an optical engine …
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Modeling the performance of the piston ring-pack with consideration of non-axisymmetric characteristics of the power cylinder system in internal combustion engines
The performance of the piston ring-pack is directly associated with the friction, oil consumption, wear, and blow-by in internal combustion engines. Because of non-axisymmetric characteristics of the power cylinder system, the performance of a ring varies along its circumference. Investigating …
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Modeling the effect of boron on microdefect formation
… analysis of the Oxidation Induced Stacking Fault Ring (OSF-Ring) which is known to correspond to a neutral region where the concentrations of the self-interstitials and vacancies are essentially in balance. The dynamics of the OSF-Ring with changes in crystal growth operating conditions, crystal …
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A numerical study of laminar to turbulent evolution and free-surface interaction of a vortex ring
… was used to study various aspects of vortex ring evolution and interaction with a free surface. An investigation of a single unbounded vortex ring at various Reynolds numbers and core thicknesses showed qualitative differences between the evolution of thin- and thick-core rings, leading to a …
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Piston ring pack design effects on production spark ignition engine oil consumption : a simulation analysis
… an engine's total oil consumption is the piston ring-pack. As a result, optimization of the ring pack is becoming more important for engine manufacturers and lubricant suppliers. This leads to current efforts to control the oil transport and flow through the ring pack. Decreasing the amount of …
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Numerical simulation of the flow in model skeletal muscle ventricles
… candidate SMV configurations. Research on the dynamics of the flow inside model SMVs has been carried out on physical and numerical models with the objective of aialysing the effect of the size and shape of the ventricle and inlet/outlet orientation of the duct. Due to the physiological limit …