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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 81 for “"Source term"”.
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Conditional source-term estimation methods for turbulent reacting flows
Conditional Source-term Estimation (CSE) methods are used to obtain chemical closure in turbulent combustion simulation. A Laminar Flamelet Decomposition (LFD) and then a Trajectory Generated Low-Dimensional Manifold (TGLDM) method are combined with CSE in Reynolds-Averaged Navier Stokes (RANS) …
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Comparative Analysis of Source Term Removal at Cook Nuclear Plant
… data to demonstrate the improvements in source term removal. Significant source term improvement was observed during the Unit 2, Cycle 18 refueling outage due to successive uses for the specialty resin after full core replacement after 6 cycles, major high source term piping removal in …
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Coupling source term, mineral reactivity and flow in radionuclide transport
… in a granite host rock is optimal for the long-term isolation of the radionuclides. The waste glass was found to play a significant role in the overall performance of the near field. This study features a new method for estimating the surface area of reacted glass powder more accurately than the …
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The Chornobyl [sic] accident revisited--source term analysis and reconstruction of events during the active phase
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Numerical Models for Scour and Liquefaction Around Object Under Currents and Waves
… of pore pressure is modeled as the effect of the source term in the storage equation. Corrections to the solutions in the literature are provided. For deep soil condition, an asymptotic solution is proposed to estimate the pore pressure. A numerical model is also developed to solve the …
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Experimental analysis and modeling of transient dissolution of RDX through mass transfer processes
… mobile-immobile sorption, and a mass transfer source term. Numerical code was developed and this model simulated the following: (1) flow rate, (2) initial mass loading, (3) particle size and (4) field oil. The simulation model results verified laboratory experiments provided by Phelan et. al. …
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Theory of nonequilibrium transport based on a class of chaotic fluctuations
… of an inhomogeneous Smoluchowski equation with a source term. The source term is identified to be associated with the statistical asymmetry of the chaotic fluctuations. In particular, the theory has enabled us to give a quantitative account for various nonequilibrium phenomena, such as: the …
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Exclusions Zones for Small Modular Reactors
… estimate the radius of the exclusion zone, by determining the distance at which the dose is at or slightly below the permitted dose to a member of the public. The method first estimates the quantity and type of radioactive materials available for release to the environment following a nuclear …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury concentrations (source term) and varying environmental …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury concentrations (source term) and varying environmental …
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Effective action approach to quantum phase transitions in bosonic lattices
… the Hamiltonian of interest a symmetry breaking source term. Using time-dependent perturbation theory, I then expand the grand-canonical free energy as a double power series in both the tunneling and the source term. From here, an order parameter field is introduced, and the underlying effective …
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A study of solute transport of radiolysis products in crud and its effects on crud growth on PWR fuel pin
… mass transport and chemical interactions as the source term, which make the problem non-linear. A Monte Carlo technique is adopted to simulate the behavior of the different species. The direct application of this study to nuclear engineering research is to aid in the design of reactors with …
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Multiphysics modeling of activity transport and evolution of CRUD and steam generator oxides in pressurized water reactors
… evolution in the primary coolant loop, a crud source term and activity transport code that can predict the concentration of active isotopes in a primary loop over time and plant operating parameters was developed, implementing mechanistic models for soluble corrosion product dissolution and …
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Radionuclide dose assessment of groundwater migrating from the Benham Events, Nts: A solute flux approach
… Site. This investigation utilized a radiologic source term generated from publicly available data and consists of forty-two radionuclides that may be present in sufficient quantities to pose a potential human health risk at the source. To avoid the complex near-cavity chemistry (e.g. solubility …
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Characterization of Radiation Fields and Dose Assessment From Fuels Manufacturing For Advanced Fuel Cycles
… Of particular concern is the increase in gamma source term from the daughter products in RepU and the mixed neutron and gamma fields introduced by MA recycle. In the interest of keeping the glovebox worker's radiation dose as low as reasonable achievable (ALARA), dose rates were calculated for …
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Tritium production analysis and management strategies for a Fluoride-salt-cooled high-temperature test reactor (FHTR)
… of nuclear systems, 2) to estimate the tritium source term in the FHTR using the ORIGEN-S computer code, and 3) to propose a tritium management strategy for the FHTR. A review of existing nuclear systems shows that tritium is the primary radionuclide in liquid and gaseous tritium release. Light …
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Dynamic Homogenization Of Linear Waves In Periodic Media And Origami-Inspired Structures
… an effective field equation with homogenized source term is formulated (via projection onto the dominant Bloch eigenstate) to obtain the leading- and second-order approximations of both macroscopic, i.e. “mean”, and microscopic wave motion. When the activated spectral neighborhood features …
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Autoignition and emission characteristics of gaseous fuel direct-injection compression-ignition combustion
… model, which incorporated the Conditional Source-term Estimation(CSE) method for the closure of the chemical source term and the Trajectory Generated Low-Dimensional Manifold (TGLDM) method for the reduction of detailed chemistry, was applied to predict the OH distribution in a combusting …
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Finite volume schemes for hyperbolic-parabolic systems : error estimates
… includes in particular the Euler system with a source term, the compressible Navier--Stokes system and the Friedrichs' system. The error estimates are valid for smooth solutions. In addition, in the case of the Friedrichs' system they hold also for solutions with jumps.
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Multidimensional dynamic compression system modeling
… of upwind flux, flux difference splitting with source term treatment, FDSS, was developed for the model. A two-dimensional axisymmetric model was developed to allow post-stall modeling of split flowpath systems such as turbofans. This model was an entirely new concept. Additionally, a …
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