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 45 for “"Direct simulation Monte Carlo"”.
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Direct simulation Monte Carlo (DSMC) in micro flows
… field in the past few decades. Particle-based direct simulation Monte Carlo (DSMC) method can be applied to micro flows simulation in a wide Kn range. The objective of this thesis is to develop the DSMC algorithm and apply it to study micro flows. In present work, the algorithm of DSMC suitable …
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On the Gap-Tooth direct simulation Monte Carlo method
… and evaluates Gap-tooth DSMC (GT-DSMC), a direct Monte Carlo simulation procedure for dilute gases combined with the Gap-tooth method of Gear, Li, and Kevrekidis. The latter was proposed as a means of reducing the computational cost of microscopic (e.g. molecular) simulation methods using …
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Modeling reactive rarefied flows in Chemical Vapor Infiltration using Direct Simulation Monte Carlo
… and surface chemistry during CVI. We use the Direct Simulation Monte Carlo method to simulate gas flow and chemical reactions around the fibers. Simulations span Knudsen numbers 0.001–20 and temperatures 1000–1600 K (near‑continuum to free‑molecular). As rarefaction increases, deposition rate …
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Assessment of high-fidelity collision models in the direct simulation Monte Carlo method
<p>Advances in computer technology over the decades has allowed for more complex physics to be modeled in the DSMC method. Beginning with the first paper on DSMC in 1963, 30,000 collision events per hour were simulated using a simple hard sphere model. Today, more than 10 billion collision events …
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Advances in an open-source direct simulation Monte Carlo technique for hypersonic rarefied gas flows
… technique is called dsmcFoam and is based on the direct simulation Monte Carlo technique. As a result of the author's work dsmcFoam has become more efficient and accurate. Benchmark studies of the standard dsmcFoam solver will be presented before introducing the main advances. The results of the …
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Weighted particle variance reduction of Direct Simulation Monte Carlo for the Bhatnagar-Gross-Krook collision operator
Direct Simulation 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 …
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Development of a high-fidelity thermochemical model for the O2+O system using direct simulation Monte Carlo
… The particle-based computational method, direct simulation Monte Carlo(DSMC), has been widely used for the hypersonic study. However, due to the lack of detailed information about particles’ collision, the developed DSMC chemical models in the past are usually with the assumption that the …
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Chemical vapor deposition modeling using direct simulation Monte Carlo with non-linear chemistry and level set profile evolution
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Modeling gap closure within vaporizing transmission lines of pulsed power machines using particle-in-cell direct simulation Monte Carlo (PIC-DSMC)
… resolve the temporal and spatial grids and run a simulation to completion for a full-scale problem given these parameters due to limitations in computational resources. To approach the full problem, however, the above numerical methods were first tested on a steady-state, fully resolved problem, …
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Isothermal helium flow measurements twrough a rectangular channel for a Wide Knudsen range
… was also compared to computer models using the Direct Simulation Monte Carlo method.
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Stochastic methods for modeling hydrodynamics of dilute gases
… gases is a stochastic particle method known as Direct Simulation Monte Carlo (DSMC). In DSMC the motion and collision of particles are decoupled to increase computational efficiency. The purpose of this thesis is to evaluate a variant of the DSMC algorithm, in which particles have discrete …
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Mesh-free modeling of spatially inhomogeneous aerosols in arbitrary geometries
… models. This dissertation investigates using the Direct Simulation Monte Carlo (DSMC) method for spatially inhomogeneous aerosol modeling. To do so, a mesh-free DSMC alternative was used that takes advantage of Euclidian distance in its clustering algorithm. Deposition, coagulation, and …
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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
… 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 statistical …
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Simulation of multiple-component charged aerosol evolution
… when more realistic problems are considered. The direct simulation Monte Carlo (DSMC) technique is capable of simulating aerosol evolution reducing simplifications in the implementation of the aerosol GDE. In this work we present a DSMC program for the simulation of multi-component polydisperse …
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Deterministic numerical simulation of the Boltzmann and kinetic model equations for classical and quantum dilute gases
… from the Boltzmann equation, the numerical simulation of the Boltzmann equation is indispensable in the study of moderately and highly rarefied gas. We aim to develop an accurate and efficient deterministic numerical method to solve the Boltzmann equation. The fast spectral method [1], …
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Computational modeling of expanded plasma plumes in vacuum and in a tank
… Oh in 1997. He developed a Particle-in-Cell and Direct Simulation Monte Carlo (PIC-DSMC) algorithm to model the expansion of a plasma plume from a Hall thruster into a vacuum. In his work he implemented a plasma-surface interaction model which determined erosion rates on surfaces made of quartz, …
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Efficient numerical methods for solving the Boltzmann equation for small scale flows
… 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 cost of …
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Efficient simulation of molecular gas transport for micro- and nanoscale applications
… make the traditional particle methods like the direct simulation Monte Carlo (DSMC) computationally inefficient. By considering only the deviation from equilibrium, the low-variance particle method introduced herein, simulates molecular gas transport in near-equilibrium regimes with drastically …
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