Salient features of USM3D Version 6.0

• Tetrahedral cell-centered, finite volume
  • Managable file sizes
  • Large-scale application efficiencies
• Full Navier-Stokes: includes all cross terms
• Thermodynamic models
  • perfect gas for AIR and CO₂
• Parallel processing
  • Parallel execution on multiple CPUs using decomposed zonal grid
  • Message passing through MPI
• Time integrations
  • Steady State (Implicit Point Gauss-Seidel & Explicit Runge-Kutta)
  • 2nd Order Time Stepping
    • Newton time stepping
    • Dual time stepping
• Upwind flux functions
  • Roe's Flux Difference Splitting (FDS)
  • Van Leer's Flux Vector Splitting (FVS)
  • AUSM scheme
  • HLLC scheme
  • MinMod and Superbee flux limiters and Eigenvalue limiter
• Turbulence Models
  • Spalart-Allmaras (SA) turbulence model
  • SA with Detached Eddy Simulation (SADES)
  • Menter Shear-Stress Transport (SST)
  • k-epsilon model
  • Algebraic Reynolds Stress Model (ARSM)
    • Girimaji nonlinear shear stress
    • Shi/Zu/Lumley nonlinear model
  • Transition tripping at prescribed locations
• Feature-based grid adaption (manual process)
• Overset Chimera grids (static and dynamic)*
  • integrated with DiRTlib by Dr. Ralph Noack, Univ. Alabama at Birmingham
• CDISC design within extracted sub-grid zones
• Grid motion
  • Solid-body or deforming grid motion
  • Special sinusoidal oscillation
  • Coupled with external motion controller
• Constant-rate rotational flow via. source terms that runs in steady-state
• Static aeroelastic coupling with NASTRAN*
• 6-Degree of Freedom (6DOF) capability*
  • Coupled with AEDC FDCADRE and SixDOF controller by Dr. Greg Power, AEDC
  • Trajectory integration
  • Store/stage separation
• Boundary conditions
  • Freestream inflow
  • Symmetry
  • Supersonic outflow
  • Characteristic inflow/outflow
  • Solid no-slip wall
  • Solid turbulent wall function
  • Solid tangency wall
  • Zonal boundary interface condition
  • Double-fringe overlapping tetrahedral grids
  • Periodic boundaries
  • Trailing-edge wake simulation
  • Propulsion systems
    • inlet with prescribed mass flow and swirl
    • jet exhaust with swirl
    • coupled jet exhaust with inlet
    • Actuator-disc propellor model with radial load variation
• Portable (Linux clusters, SGI, HP, IBM, Mac)

* Requires 3rd party software request

NASA Official Responsible For Content: Dr. Neal T. Frink
Site Curator: Dr. Neal T. Frink
Last Updated: August 8, 2003

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