About

USimHEDPcolor For modeling complex lab plasmas in applications such as magnetic reconnection, plasma liner experiments, and plasma accelerators.

 

USim simulation of merging plasma jets

USim for High Energy Density Plasmas examples and documentation, demonstrating independent evolution of ions and electrons, coupling of ions, electron fluids, and electromagnetic fields, as well as general equation of state for ions and electrons, reduce your learning curve and ensure faster results.

 

Features

  • Gas Dynamic Magnetohydrodynamics
  • Separate evolutions for ions and electrons
    • Densities
    • Velocities
    • Temperatures
  • Anisotropic temperatures for ions and electrons
  • General Equation of State
  • Full Maxwell’s Equations

 

Questions? Contact us.

 

 

Example Simulations Included

 

Images

USim flow over forward facing step density simulation
Flow Over Forward-facing Step Density

Density distribution for a simulation of compressible, supersonic flow over a forward-facing step using an unstructured mesh in USim for Basic Simulations.


USim magnetic reconnection simulation

Magnetic Reconnection

Simulation of the GEM challenge problem using the two-fluid capability of USim for High Energy Density Plasmas.


USim Rayleigh Taylor instability simulation

Rayleigh-Taylor Instability

Density distribution at the end of the linear growth stage for a simulation of the Rayleigh-Taylor instability using USim for Basic Simulations.

 
USim flow over forward facing step mach number simulation
Flow Over Forward-facing Step Mach Number

Flow mach number for a simulation of compressible, supersonic flow over a forward-facing step using an unstructured mesh in USim for Basic Simulations.

 

USim merging plasma jets simulation

Merging Plasma Jets

Simulation of merging plasma jets for the Plasma Liner Experiment using USim for High Energy Density Plasmas.


USim supersonic flow over cylinder simulation

Supersonic Flow Over Cylinder

Simulation of laminar supersonic flow over a cylinder, showing the formation of bow shock and the final steady wake, using USim for HyperSonics.

 
USim kelvin helmholtz instability simulation
Kelvin-Helmholtz Instability

Density distribution at the end of the linear growth stage for a simulation of the transonic Kelvin-Helmholtz instability using USim for Basic Simulations.

 

USim RAMC re-entry vehicle simulation

RAMC Reentry Vehicle

Simulation of a RAMC reentry vehicle, including 7 species chemical reactions, using USim for HyperSonics.


USim unstable plasma Z-pinch simulation

Unstable Plasma z-Pinch

Density distribution in the non-linear phase of an unstable plasma z-Pinch using USim for Basic Simulations.

 

 

USim GEM Reconnection Challenge Animations

Geospace Environment Modeling (GEM) Reconnection Challenge

The Magnetic Reconnection Challenge

The Geospace Environment Modeling Reconnection Challenge (GEM Reconnection Challenge) is a classic simulation described in:

Birn, J., Drake, J. F., Shay, M. A., Rogers, B. N., Denton, R. E., Hesse, M., ... & Pritchett, P. L. (2001). Geospace Environmental Modeling (GEM) Magnetic Reconnection Challenge. Journal of Geophysical Research: Space Physics (1978–2012), 106(A3), 3715-3719. DOI: 10.1029

The goal of that work was to produce a benchmark for plasma codes to compare with for the simulation of magnetic reconnection.

The Simulations

In these simulations USim was used to solve this problem using a semi-implicit two-fluid algorithm with diffusion based electric field divergence cleaning. The MUSCL type scheme was run on a 1024X512 cell grid with 200 frames between time 0 and 400 ion cyclotron times. The electron to ion mass ratio was 1/25. The simulation is taken from a standard example in USim run at high resolution. The model used includes full Maxwell's equations and full fluid equations for the electrons (including separate electron and ion density) so it should not be confused with Hall MHD which has less physics.

Geospace Environment Modeling (GEM) Reconnection Challenge Animations

Electron Z Current Density

This simulation shows the evolution of electron Z current density (out of the plane current density).

Ion Z Current Density

This simulation shows the evolution of ion Z current density (out of the plane current density).

Electron Velocity in the X Direction

This simulation shows the evolution of the electron velocity in the x direction.

 
 
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