About

USimHScolor For modeling complex flows for hypersonic flight in applications such as hypersonic flight, scram jet design, and reentry vehicles.

 

USim RAMC re-entry vehicle simulation

USim for Hypersonics examples and documentation demonstrating Navier-Stokes equations, including reaction chemistry, as well as accelerators for time-integration of chemistry, viscous, and conductivity operators, reduce your learning curve and ensure faster results.

 

Features

  • Navier-Stokes viscosity and thermal conductivity with anisotropic viscous coefficients
  • Reaction Chemistry
  • Accelerators for time-integration of chemistry, viscous, and conductivity operators
  • Multi temperature compressible flow
  • Multiple Species
  • Real Gas Equation of State
  • General Equation of State

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 Radio Communication Blackout Animations

USim Radio Communication Blackout simulation animations:

7 Species Simulation

The first USim Radio Communication Blackout simulation shows 7 species (including ionization) reacting flow at 7650m/s over a cylinder at 61 km altitude. This is a 2D simulation.

In the 7 Species simulation, an electromagnetic plane wave with 0.5 GHz frequency is excited at the left boundary, reflecting off of the plasma layer, which forms as a result of the flow over the cylinder. The simulation demonstrates radio communication blackout, which is a phenomena that occurs during re-entry, and coupling between a high speed reacting flow and a full electromagnetic simulation inside USim.

Electric Field in the Y Direction from Shockwave

Near "equilibrium" in the reacting flow simulation, Maxwell's equations are turned on along with multi-fluid electromagnetic algorithms and the time step drops to resolve the speed of light. The algorithm steps over the plasma frequency. In this simulation the electric field in the Y direction is plotted. It is observed that the field does not pass through the regions of high electron density, illustrating radio communication blackout.

Electric Field in the X Direction from Shockwave

The electric field in the X direction is created due to reflection off of the plasma layer. This video shows the x component of the electric field.

 
Formation of NO

This simulation shows the formation of NO as a result of the shockwave over the cylinder. NO number density is plotted in MKS units. In the process electrons are also formed during the ionization of NO.

 

RAMC Reentry Module Simulation

The second USim Radio Communication Blackout simulation (USim RAMC Reentry Module simulation), shows electromagnetic wave propagation through the plasma layer on RAMC reentry module. This simulation was performed for the flight conditions: 61 km altitude, Mach 23 at 15° angle of attack.

RAMC Reentry Module Simulation

This simulation shows the plasma density distribution and EM wave propagation around the RAMC reentry module. The peak density of the plasma is observed near the stagnation region of the nose cap, where highest temperatures exist. The EM wave shown in the animation with red and blue contours, corresponding to positive and negative amplitudes, propagates uninterrupted until it reaches the plasma layer of RAMC. The wave is then reflected by plasma as shown in the XY and XZ cut planes. The EM wave reflects when the plasma frequency reaches the EM wave frequency.

 
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