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Showing 1 to 20 of 238 for “"PIC"”.
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PIC 18F452 implementation of digital filters
… hopes to explore the computational limits of the PIC18f452 chip by encompassing the designing and implementation of two types of filters for the PIC 18F452 microcontroller. The main purpose of this research is to implement a floating-point least mean square (LMS) error adaptive filter and its …
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Hybrid-PIC modeling of Hall thruster plumes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
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A Homegrown DSMC-PIC Model for Electric Propulsion
… charged particles and make SINATRA a DSMC-PIC hybrid. The electric potential is calculated through a 7-point 3D stencil on the mesh nodes and solved with a Gauss-Seidel solver. It is validated through test cases of charged particles to demonstrate the accuracy and capabilities of the model. …
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Fully-kinetic PIC simulations for Hall-effect thrusters
… used the fully-kinetic particle-in-cell (PIC) model. Although much more computationally expensive than the fluid codes, the full-PIC codes allowed for non-equilibrated thruster regions and did not rely on Maxwellian distributions. However, these simulations suffered for two main reasons. …
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Hall truster plume simulation using a hybrid-PIC algorithm
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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PIC simulation of a ceramic-lined Hall-effect thruster
A full Particle-In-Cell code, written by James Szabo [23], was used to model a 50W TAL and 3kW SPT thruster. This code treats single and double ions, neutrals and electrons as particles, moved forward by a leapfrog algorithm at each timestep, matching the lowest of the plasma and the cyclotron …
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Plan de comunicación interna para la empresa logística PerúInterCargo (PIC)
PeruInterCargo (PIC) is one of the three most important logistics operators in Peru and has more than 40 years of service. PIC currently faces the lack of commitment from the leaders of each team with respect to the organizational culture and the consequent loss of talent. This paper proposes to …
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Hybrid-PIC modeling and electrostatic probe survey of Hall thrusters
… thrusters, an evolved hybrid particle-in-cell (PIC) numerical model was developed. A set of quasi-one-dimensional fluid equations are used for electrons, and a particle-tracking Boltzmann solver is used for the heavy species. The two solutions are linked by charge neutrality. A novel statistical …
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Development of a Parallel Electrostatic PIC Code for Modeling Electric Propulsion
… System X, ranked 7th. DRACO, the Virginia Tech PIC module to Coliseum, was modified with parallel algorithms to create a full parallel PIC code. A parallel solver was added to DRACO. It uses a Gauss-Seidel method with SOR acceleration on a Red-Black checkerboard scheme. Timing results were …
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Nonlinear Evolution of Mirror Instability in the Earth's Magnetosheath in PIC Simulations
<p>Mirror modes are large amplitude non-propagating structures frequently observed in the magnetosheath and they are generated in space plasma environments with proton temperature anisotropy of larger than one. The proton temperature anisotropy also drives the proton cyclotron instability which has …
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PIC simulation of SPT Hall thrusters : high power operation and wall effects
The fully kinetic Hall Thruster simulation built by [1] and used by [2] is further refined and used to obtain results for the P5 SPT Hall thruster at 3kw and 5kw operation. Performance data agree well with experiments [3], although very low values of anomalous diffusivity must be used for …
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CHAOS: A multi-GPU PIC-DSMC solver for modeling gas and plasma flows
… three-dimensional, multi-GPU, Particle-in-cell (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 …
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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.
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Implementing a Rib Fracture Management Pathway and PIC Scoring Tool to Reduce ICU Readmissions
… pathway, Pain, Inspiratory Capacity, and Cough (PIC) score board, patient and family handout, timeline and educational plan for staff was created using power point presentations, handouts and visual aids. Currently, actions in the timeline are up to date and the revised educational plan will be …
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Advances in fully-kinetic PIC simulations of near-vacuum Hall thruster and other plasma systems
… used the fully-kinetic particle-in-cell (PIC) model. Although much more computationally expensive than the fluid codes, the full-PIC codes allowed for non-equilibrated thruster regions and did not rely on Maxwellian distributions. However, these simulations suffered for two main reasons. …
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Development of the DRACO ES-PIC code and Fully-Kinetic Simulation of Ion Beam Neutralization
… (ES) code which uses the particle-in-cell (PIC) formulation to track plasma particles through a computational domain, and operates within the Air Force COLISEUM framework. The particles are tracked on a non-standard mesh, which combines the benefits of a Cartesian mesh with the …
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Response Of Plasma Facing Components In Tokamaks Due To Intense Energy Deposition Using Particle-In-Cell(pic) Methods
… the chamber far from where it was originally picked. The modeling of off-normal events such as Disruptions and ELMs requires the simultaneous solution of three main problems along time: a) the heat transfer in the plasma facing component b) the interaction of the produced vapor from the …
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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)
… 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 time to …
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