Introduction to Vlasov Solvers

A simple 1D-1V Vlasov code for two-stream instability is developed. The code is based on a splitting scheme proposed by Cheng and Knorr in 1975.

Multigrid Solver

The Multigrid scheme for accelerating convergence of iterative matrix solvers is explained and demonstrated with a one-dimensional Python code.

Handling Surfaces: Line Triangle Intersection Example

This article presents an algorithm for performing particle-surface impact checks using a mixed triangular-quadrilateral mesh with warped and overlapping elements.

Starfish DSMC Tutorial: Supersonic Jet and Argon Diffusion

This tutorial shows you how setup a DSMC simulation using Starfish. We model expansion of an atmospheric pressure gas to a low pressure reservoir and also compute self-diffusion coefficient of argon.

Vorticity – Stream Function Formulation for Axisymmetric Flow

Vorticity - Stream Function formulation for incompressible Navier Stokes equation is developed and demonstrated with Python code for flow in a cylindrical cavity. More complex geometry from a Java code is also shown.

Fun with Raspberry Pi – plasma simulation code performance

Raspberry Pi 3 Model B is a $40 credit card sized computer with 1.2GHz CPU and 1Gb of RAM. But before buying bunch of the boards to build a small MPI cluster, I wanted to see how the performance compares to a typical PC.

Free molecular flow in a cylindrical pipe – with multithreading

In this blog post we develop a multi-threaded C++ program for computing molecular transmission through a cylinder of a varying length. The results are compared against tabulated data of Clausing.

Brief Intro to GPU PIC with CUDA

This post shows how to develop a PIC plasma simulation code that uses NVIDIA CUDA to perform computations on the graphics card (GPU). Even without any optimization, the GPU version runs almost twice as fast as the CPU version for a large number of pa...

3D Viewer

WebGL-based interactive 3D plotter for surface mesh files in Paraview's .vtu or .vtp formats

Particulate Contamination Transport on Orbiting Satellites

Particulates launched from an orbiting object may intersect the satellite on a future orbit and cause contamination of surfaces beyond the line of sight of the originating surface. This post describes a simply Python code that was developed to model ...

CTSP Molecular Contamination Modeling Validation

Summary of CTSP molecular contamination modeling validation effort to date

Finite Element Particle in Cell (FEM-PIC)

Example Finite Element Particle in Cell code for flow of ions past a charged sphere on an unstructured mesh

Advanced PIC Course Debrief

Some observations and lessons learned from the Advanced PIC course. Were you a student? I would love to get your feedback!

QCM Analyzer

Interactive on-line analyzer of Quartz Crystal Microbalance (QCM) log files. The analyzer can visualize multiple channels, automatically compute smoothed delta-deltas, and lets you interactively analyze TGA data.

Detailed Surface Model

New detailed model was developed for the space-surface interface. Instead of using sticking coefficients, the model uses residence time to determine if a molecule "sticks". Adsorbed molecules are added to a surface layer and objects can also contain ...

Particle In Cell Method in Cylindrical Coordinates

Details of implementing plasma simulations with the Particle In Cell Method in cylindrical coordinates. We develop a simulation of a simplistic ion gun.