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 “"Conservation of mass"”.
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Investigating the Pedagogical Content Knowledge of Georgia 6-12 Science Teachers in Relation to Conservation of Mass
<p>The Law of Conservation of Matter is a crosscutting concept in science that has implications for all disciplines of science. Conservation of Matter concepts are interwoven into all middle school and high school science courses both within the Next Generation Science Standards (NGSS) and the …
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Toward Ideal Large -Eddy Simulation
… flux models are expressed as modifications of standard fourth-order schemes, so that numerical and subgrid effects are treated simultaneously. The LES obeys only a bulk conservation of mass, but it is shown that errors introduced by enforcing a second-order divergence-free condition are …
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The Effect of Shear Flow on Solidification Microstructures
… are performed to determine the effect of fluid flow near a solidifying interface on the temperature and concentration fields existing during solidification, and the changes wrought on the microstructure by those fields. The solidification interface position and speed are controlled by …
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A 3-dimensional H-adaptive algorithm for groundwater flow and contaminant transport
The simulation of contaminant transport through the subsurface is a very useful way to effectively design mitigation methods for cleanup and prevention of the deterioration of groundwater; The GWADAPT3 code is developed using the finite-element method and mesh adaptation to simulate groundwater …
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A unified approach to the formulation of non-consistent rod and beam mass matrices for improved finite element modal analysis
A criterion using rigid-body modes to verify the conservation of mass inertias is presented. Conservation of rod element mass guarantees convergence to the exact eigensolutions of a rod. Conservation of beam element mass guarantees convergence to the exact eigensolutions of a Bernoulli-Euler beam …
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Effect of Passive Clean Air Injection Into the Wake Region of a Moving Ground Vehicle
… a moving ground vehicle is responsible for 70% of the aerodynamic drag when the speed of 90km/h is achieved. The topic of wake region manipulation has been revisited multiple times and with varying techniques. When manipulating the flow utilizing a fully passive method, pressure drag can be …
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Numerical Framework for Simulating Multiphase Flows with Phase Change
The design of next generation internal combustion engines will require a more detailed understanding of the dynamics of fuel combustion. One way of studying this combustion process is through computational simulations of fuel injection, break-up and combustion processes. However, currently no …
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Numerical study on scaling effects and decoupled network-based simulation of gaseous explosion
… seeks to improve the prediction efficiency of gaseous explosions realized by numerical simulations in a full-scale underground network using a decoupled method. To provide quick predictions of overpressure distribution of methane explosions in underground airway networks, a two-section …
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Modelling of screw compressor plant operation under intermittent conditions
… Also, following demand, compressor plants often work intermittently with frequent starts and stops. This may cause premature wear, decrease of compressor performance and even failure, which might cost millions of pounds to industry in downtime. However, there is still a lack of published …
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Combustion oscillations in a ducted burner
… documented phenomenon. This is particularly true of the violent, low frequency combustion oscillation encountered in gas turbine reheat systems, commonly referred to as reheat buzz. This thesis describes an investigation, both experimental and theoretical, of oscillatory premixed propane-air …
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Hydrodynamics and freshwater diversion within Barataria Basin
… simulate estuarine processes. The equations for conservation of mass and momentum predict specific physical processes when forced by tidal and salinity variations at the open boundaries, wind forcing patterns, precipitation and evaporation over the model domain, and freshwater runoff as point …
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Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation
In this work, we first analyze the behavior of the acoustic wave from the theoretical point of view using a simplified 1-dimensional model. The model was developed based on the conservation of mass, the conservation of momentum, and the state equation; in addition, the fluid medium obeys Stokes …
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The numerical analysis of turbulent flow around off-shore structures
… the physical, mathematical and numerical basis of analysis work performed for predicting the flow around three-dimensional bluff body configurations. The flow has been treated as steady, incompressible, turbulent. The predictions were made using a two-equation turbulence model, solving transport …
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A multidomain spectral method for computational aeroacoustics
… sound propagation in, and radiation from, turbofan inlets. The physics of sound propagation is modeled by the system of partial differential equations that describe conservation of mass, momentum and energy in inviscid flows. The equations are solved numerically in the time domain as an initial …
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Analysis of a partial differential equation related to pressure-driven separations of binary liquids
Pressure-driven diffusion, in which a flux of species in a binary or multi-component fluid is driven by a pressure gradient, is known to be an important mechanism for effecting separations in a variety of chemical systems, including the separation of 238UF6 from 235UF6 in gas centrifuges, and in …
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A new parabolized Navier-Stokes scheme for hypersonic reentry flows
… the differential equations governing the conservation of mass, momentum and energy, and the algebraic equation of state for a perfect gas are solved simultaneously in a coupled manner. The idea is presented that by treating the governing equations in this manner (rather than eliminating …
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Optimization based nonlinear feedback control for pedestrian evacuation from a network of corridors
An organized evacuation of pedestrians entrapped in a building in emergencies such as those caused by fire, bomb blast, or intentional or unintentional release of toxins in the environment is of utmost importance. The focus of this study is on the development of a formal control methodology for an …
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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
… oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[P04]+[02]) are conserved in layers that are not in contact with the surface. A globally-consistent solution is obtained …
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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
… oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[PO 4]+[0 2]) are conserved in layers that are not in contact with the surface. A globally-consistent solution is …
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Evacuation Distributed Feedback Control and Abstraction
… evacuation dynamics are based on the laws of conservation of mass and momentum and are described by nonlinear hyperbolic partial differential equations. As such the system is distributed in nature. We address the design of feedback control for these models in a distributed setting where the …
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