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.
Results
Showing 1 to 20 of 50 for “"DSMC"”.
-
DSMC modeling of micromechanical devices
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
-
Direct simulation Monte Carlo (DSMC) in micro flows
… 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 for micro flows is developed …
-
A Homegrown DSMC-PIC Model for Electric Propulsion
… to model the flow. A good solution is to use the DSMC method, which uses a combination of particle modeling and statistical methods for modeling the simulated molecules. A DSMC simulation known as SINATRA has been developed with the goal to model electric propulsion plumes. SINATRA uses an octree …
-
Development of an AMR Octree DSMC approach for shock dominated flows
… three-dimensional direct simulation Monte Carlo (DSMC) program are described. The code employs an Octree based adaptive mesh refinement (AMR) that gives flexibility in capturing multi-scale physics. It is coupled with a robust cut-cell algorithm to incorporate complex triangulated geometries. With …
-
Consistent treatment of transport properties of weakly-ionized gas mixtures in DSMC
The direct simulation Monte Carlo (DSMC) is a probabilistic, particle-based computational technique, that is widely used for solving rarefied and highly non-equilibrium flows. The transport properties in DSMC are obtained as a result of the transport of mass, momentum and energy during binary …
-
An excursion with the Boltzmann equation at low speeds : variance-reduced DSMC
… 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 estimating hydrodynamic properties. Unfortunately, in cases where the …
-
CHAOS: A multi-GPU PIC-DSMC solver for modeling gas and plasma flows
… (PIC)-direct simulation Monte Carlo (DSMC) solver called Cuda-based Hybrid Approach for Octree Simulations (CHAOS) that is presented in this work. This computational tool has been applied to candidate PICA-like TPS materials that consist of an irregular porous network of fibers to …
-
Computational modeling of expanding plasma plumes in space using a PIC-DSMC algorithm
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
Simulation of Rarefied Flows in MEMS Devices by Atomistic and Multiscale Methods
… with such analysis, multiscale coupling of DSMC with the continuum models for fluid flow is studied. The Schwarz alternating method is utilized for coupling, and the continuum equations are solved using the finite cloud method. The agreement of the coupled method with DSMC is shown and the …
-
Multi-scale particle transport modeling: Kinetic high-fidelity DSMC approaches and system-scale Eulerian-Lagrangian simulations for high-speed flows
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
-
On the Gap-Tooth direct simulation Monte Carlo method
This thesis develops 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 …
-
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 …
-
Stochastic methods for modeling hydrodynamics of dilute gases
… 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 velocities. The most important …
-
Modeling gap closure within vaporizing transmission lines of pulsed power machines using particle-in-cell direct simulation Monte Carlo (PIC-DSMC)
… for modeling gap closure within an overall DSMC-PIC approach. Gap closure is a difficult computational problem due to massive gradients in density and electrostatic properties, extreme regime (relativistic electrons), and highly nonequilibrium characteristics. It is very challenging this …
-
Analysis of gas-solid multiphase flow systems in extreme flight environments using a one-way coupled DSMC-Lagrangian overlay-based computational framework
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
-
Development of a high-fidelity thermochemical model for the O2+O system using direct simulation Monte Carlo
… 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 rotational and vibrational …
-
Efficient numerical methods for solving the Boltzmann equation for small scale flows
… 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 DSMC (for a given signal to noise ratio) increases rapidly …
-
Modelling of satellite control thruster plumes
… (c) the Direct Simulation Monte Carlo method (DSMC). The first two methods are derived from continuum equations whilst the third adopts a discrete particle approach.<br/>Several DSMC schemes exist for treating the collisional behaviour of the gas, and it was unclear which would be best suited …
-
Assessment of high-fidelity collision models in the direct simulation Monte Carlo method
… 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 can be simulated per hour for the same problem. Many new and …
Page 1 of 3