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Showing 1 to 20 of 25 for “"particle simulation"”.
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Particle simulation of laser-produced plasmas on the basis of analytic magnetohydrodynamic solutions
… of the hot electron transport problem, a particle simulation code is developed based on an analytic self-similar model of the laser-produced plasma that includes the self-generated magnetic field. The code is thus capable of predicting various time-dependent transport properties of a …
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Simulation of Multi-Layer-Liquid Sloshing Effects on Vessel Motions by Using Moving Particle Simulation
… programs. For the sloshing program, Moving Particle Simulation (MPS), which is based on the Lagrangian approach, is used. This sloshing program is validated through comparisons with corresponding experimental results both qualitatively and quantitatively. This validated MPS method has been …
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Vorticity structure and evolution in a transverse jet with new algorithms for scalable particle simulation
… We develop a massively parallel 3-D vortex simulation of a high-momentum transverse jet at large Reynolds number, featuring a discrete filament representation of the vorticity field with local mesh refinement to capture stretching and folding and hair-pin removal to regularize the formation …
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Arcing on high voltage solar arrays in low earth orbit : theory and computer particle simulation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Modeling reactive rarefied systems using a novel quasi-particle Boltzmann solver
… this work is to build up the capability of Quasi-Particle Simulation (QuiPS), a novel flow solver, such that it can adequately model the rarefied portion of an atmospheric reentry trajectory. Direct Simulation Monte Carlo (DSMC) is the conventional solver for such conditions, but struggles to …
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Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas
… A three-dimensional Immersed Finite Element Particle-In-Cell (IFE-PIC) method is developed to model surface charging involving complex boundary conditions. This method extends the previous IFE-PIC algorithm to explicitly include charge deposition on a dielectric surface for charging …
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Investigation of efficient geometric shape algorithms for numerical simulation of discrete particle systems
The efficiency of a discrete particle simulation implementation relies on several factors, including the geometric representation, contact resolution, and neighbor-sorting algorithm used. The focus here is on the first two of this list: the geometric representation and the corresponding contact …
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Efficient particle methods for solving the Boltzmann equation
A new particle simulation method for solving the Boltzmann equation is presented and tested. This method holds a significant computational efficiency advantage for low-signal flows compared to traditional particle methods such as the Direct Simulation Monte Carlo (DSMC). More specifically, the …
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Runge-Kutta Discontinuous Galerkin method for the Boltzmann equation
… Boltzmann solution method is a stochastic particle simulation scheme known as Direct Simulation Monte Carlo (DSMC). Unfortunately, DSMC is not very effective in low speed flows (typical of small scale devices of interest) because of the high statistical uncertainty associated with the …
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Performance Analysis of a Binary-Tree-Based Algorithm for Computing Spatial Distance Histograms
… environment is made up of composition of small particles. Hence, particle simulation is an important tool in many scientific and engineering research fields to simulate the real life processes of the environment. Because of the enormous amount of data in such simulations, data management, …
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Charged Particle Optics Simulations and Optimizations for Miniature Mass and Energy Spectrometers
<p>Computer simulation and modeling is a powerful tool for the analysis of physical systems; in this work we consider the use of computer modeling and optimization in improving the focusing properties of a variety of charged particle optics systems. The combined use of several software packages and …
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Instability Studies on a Spherical Inertial Electrostatic Confinement
… etc. For this purpose, a perturbative (deltaf) particle simulation techniques for a kinetic analysis is applied to simulate completely the dynamic evolution of perturbed Vlasov-Poisson equations and, in addition, to achieve much more accurate simulations of the nonlinear dynamics using less …
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Efficient numerical methods for solving the Boltzmann equation for small scale flows
… method for solving the Boltzmann equation is a particle simulation method known as direct simulation Monte Carlo (DSMC). DSMC is very efficient for high-speed (more generally, high signal) flows; unfortunately, due to the statistical sampling used to obtain hydrodynamic fields, the computational …
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Deriving and verifying a general granular locomotion scaling law
… modeling these interactions requires discrete particle simulation methods, such as the Discrete Element Method (DEM), a process that is prohibitively computationally intensive for large systems. The difficulty of modeling granular materials has posed great difficulty for design engineers, …
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CAD-Based Geometry Representations for Monte Carlo Fusion Neutronics Methods and CSG vs. DAGMC Performance Tradeoffs in OpenMC
… geometries in OpenMC is analyzed by evaluating particle simulation rates and memory usage across four progressively complex fusion-like models. Performance results reflect positively on DAGMC transport, but areas of future work are identified for more comprehensive results. From the lens of …
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Table-driven quadtree traversal algorithms
… algorithm for a quadtree (or octtree) of moving particles. Particle simulations have had the long-standing problem of calculating the interactions among n particles. It takes O(n2) time for direct computation of all the interactions between n particles. Greengard [Gree87, Carr87] has devised a …
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Parallel simulation of particle dynamics with application to micropolar peridynamic lattice modeling of reinforced concrete Structures
… we will explain a general purpose parallel particle dynamics code (pdQ2). We describe the re-architecting of pdQ (the MD/PD code that was developed in [Sakhavand 2011]) as pdQ2. pdQ2 is completely non-domain-specific in that user files are clearly separated from non-user files and no #ifdefs …
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MAGNETISATION REVERSAL STUDIES OF PARTICULATE RECORDING MEDIA.
… investigation of the reversal mechanism of particles within the media have been made. The particle systems investigated comprised three audio y-Fe203 tapes, three audio Cr02 tapes and a video metal particle tape. An absolute measure of the interaction effects within particulate tapes has …
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A novel algorithm for creating density dependent, coarse-grained models for the simulation of surfactant systems
Large-scale simulations of solvated molecules that treat the solvent explicitly are very computationally expensive, and as a result work has been done on modifying the potentials to treat solvent implicitly. Implicit solvation is well-known in Brownian Dynamics of dilute solutions, but offers …
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An excursion with the Boltzmann equation at low speeds : variance-reduced DSMC
… is most efficiently solved using a stochastic particle simulation method known as direct simulation Monte Carlo (DSMC). The latter is a simple and versatile simulation method which is very efficient in producing samples of the single particle distribution function which can be used for …
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