Global ETD Search
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Showing 1 to 20 of 29 for “"Particle method"”.
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Vibrational states of odd nuclei by the quasi-particle method
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1964.
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Simulation of free-surface flows and development of an improved particle method
Undergoing development for decades, the mesh-free methods, both Smoothed Particle Hydrodynamics (SPH) and the Moving Particle Semi-implicit method (MPS), have become useful numerical tools for studying free-surface flows in various engineering problems. They are able to easily simulate complicated …
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A hybrid particle method for the kinetic treatment of magnetized plasma sheaths
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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A fast 3D particle method for simulations of buoyant and reacting flows
… areas related to three dimensional vortex methods and their application to multiphysics problems. The first is the solution of a generic scalar transport equation by advecting and diffusing the scalar gradient along a particle trajectory and onto a mesh, respectively, and recovering the …
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Unstructured grid simulations of shocks and detonations in two-phase flows
… of compressible two-phase flows containing inert particles. An existing conservative, monotonic compressible flow solver with an unstructured, adaptive mesh was used as the basis for code development. This flow solver incorporated the Finite Element Method-Flux Corrected Transport scheme, which …
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Slave particle study of the strongly correlated electrons
… to handle with these issues is the slave particle method. In the first part of this thesis, using a more general slave particle method we study the strongly correlated Hubbard model, whose ground state may represent a Fermi liquid state at two spatial dimensions. We study the phase diagram …
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Weighted particle variance reduction of Direct Simulation Monte Carlo for the Bhatnagar-Gross-Krook collision operator
… Monte Carlo (DSMC)-the prevalent stochastic particle method for high-speed rarefied gas flows-simulates the Boltzmann equation using distributions of representative particles. Although very efficient in producing samples of the distribution function, the slow convergence associated with …
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A comparative numerical study on the failure evolution at different simulation scales
… mesoscale, and macroscale. Recently, a particle method that is the material point method (MPM) has become a popular research topic at macroscale due to its advantage combining the Eulerian and Lagrangian descriptions. However, the MPM has not been evaluated in a systematic manner for the …
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Dynamic water quality modeling using cellular automata
… computers is dependent on the availability of methodologies capable of exploiting the new computing environment. The research presented here focused on a modeling approach, known as cellular automata (CA), which is characterized by a high degree of parallelism and is thus well suited to …
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An efficient multinomial sampling algorithm for spatially distributed stochastic particle simulations
This study develops a new particle-resolved method (PGM) for stochastically simulating the transport of particles by advection and diffusion processes. This particle-resolved method is based on a multinomial sampling algorithm which calculates the number of particles transferred between adjacent …
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Resolving bacteria with the coulter counter
Present methods of counting and sizing of bacteria arc usually tedious and often have low statistical validity. The objective of this thesis was to investigate the feasibility of counting and sizing of bacteria with the Coulter Counter and to evaluate orifices which were prepared in this …
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Stochastic methods for modeling hydrodynamics of dilute gases
… small scale sub-micron gas flows, continuum methods, i.e. Navier Stokes equations, no longer apply. Molecular Dynamics (MD) approaches are then more appropriate. For dilute gases, where particles travel in straight lines for the overwhelming majority of the time, MD methods are inefficient …
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Low variance methods for Monte Carlo simulation of phonon transport
… In this work, we focus on Monte Carlo methods for phonon transport, intended for studies in microscale heat transfer. After reviewing the theory of phonons, we use scientific literature to write a Monte Carlo code solving the Boltzmann Transport Equation for phonons. As a first …
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Efficient simulation of molecular gas transport for micro- and nanoscale applications
We describe and validate an efficient method for simulating the Boltzmann transport equation in regimes typically encountered in nanotechnology applications. These transport regimes are characterized by non-vanishing Knudsen numbers, preventing simple analyses based on the Navier-Stokes equations; …
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A Bayesian Approach to Estimating Background Flows from a Passive Scalar
… adapted to the problem. One is an adjoint method for computation of the gradient of the log likelihood, a key ingredient in many numerical methods. A second is a particle method that allows direct computation of point observations of the solute concentration, leveraging the structure of the …
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PREDICTING THE SENSITIVITY OF A BERYLLIUM/SCINTILLATOR FUSION NEUTRON DETECTOR COMBINING EXPERIMENTAL METHODS AND MONTE CARLO MODELS
For this work a methodology has been developed to predict the sensitivity of a beryllium/scintillator fusion neutron detector. Neutrons may be captured by the beryllium via the 9Be (n, α) 6He nuclear reaction, where the product nucleus, 6He, decays by beta emission. The beta particles can be …
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The interaction of fast neutrons with shielding and fusion blanket materials
… measured to test nuclear data and calculational methods for D - T fusion reactor neutronics. The neutron spectra measured were performed by an organic scintillator using a pulse shape discrimination technique based on a charge comparison method to reject the gamma rays counts. A computer …
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A detailed, stochastic population balance model for twin-screw wet granulation
… granulation using the stochastic weighted particle method. A number of new particle mechanisms are introduced and existing mechanisms augmented including immersion nucleation, coagulation, breakage, consolidation, liquid penetration, primary particle layering and transport. The model’s …
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Spray and Single Droplet Impingement on a Wall
… are derived and are subsequently solved using a particle method. It is shown that during the time where most of the film evolution takes place, the gravitational force and gas-induced shear stress are negligible. It is also shown that the thin film assumptions break down when a derived …
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Analysis of the smoothed particle hydrodynamics method for free-surface flows
Smoothed Particle Hydrodynamics (SPH) is a simple and attractive meshless Lagrangian particle method with applications in many fields such as astrophysics, hydrodynamics, magnetohydrodynamics, gas explosions, and granular flows that has demonstrated ability to simulate highly non-linear …
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