Rocstar GEN2'5 Goals

1
Rocstar GEN2.5 Goals

• Perform detailed, fully coupled simulations of
  solid propellant rockets
• Employ science-based physical models
• Develop general-purpose multiphysics simulation
  tool
• Allow non-matching descretizations
• Adapt to changing geometries
• Leverage cutting-edge CS infrastructure
• Minimize changes needed to incorporate existing
  physics applications
• Facilitate spatial and temporal coupling
• Maximize parallel performance

2
GEN2.5 Components

• Structural Mechanics
• Rocfrac explicit, cracks
• Rocsolid implicit
• ALE formulation
• Large deformations

• Fluid Dynamics
• Rocflo structured
• Rocflu unstructured
• Explicit, ALE formulation
• Unsteady, compressible, viscous, turbulence,
  particles, smoke, radiation

3
GEN2.5 Architecture
4
Explicit Time Stepping Scheme
tn1
burn rate
traction
Dtn
Dtf
surface motion, mass flux
pressure, temperature
Dts
tn
Solid
Comb.
Fluid

• Execution 1) all solid, 2) all fluid, 3) all
  combustion
• Updated interface data passed via Roccom/Rocface
• Predictor/corrector scheme repeats same time step
  using improved estimates of interface quantities

5
Rocstar GEN2.5 Scalability
6
Flexible Inhibitor with Turbulence

• Inhibitors can protrude into fluid domain
• Rubber ring controls burning in joint slots
  between propellant segments
• Motion of inhibitor affects vortex shedding
  frequency
• Science
• Turbulent flow downstream enhances burn rate
• Perturbations may drive instability

Slot
Slot