1.1 Flow equations

• Three-dimensional, compressible Reynolds-Averaged Navier–Stokes (RANS) equations
• Conservation of mass, momentum and total energy in integral form
• Steady and quasi-unsteady time-marching solutions

1.2 Turbulence modeling

• Standard two-equation k–ε turbulence model for attached and mildly separated flows
• Effective viscosity formulation for closure of Reynolds stresses
• Wall functions for practical engineering Reynolds numbers

1.3 Additional solvers

• Laminar Navier–Stokes solver (for low-Re applications and method verification)
• Compressible inviscid (Euler) solver for quick preliminary analysis

2.1 Cartesian grid framework

• Structured, body-independent Cartesian volume grid
• Automatic domain generation around the imported STL geometry
• User control over domain extents and grid resolution

2.2 HIST methodology Proprietary

• Hanley Innovations Surface Treatment (HIST) algorithm for representing solid boundaries
• Flow solution computed in volume cells while the geometry is represented implicitly
• Suitable for complex geometries (aircraft, UAVs, rockets, hydrofoils, etc.) without manual surface meshing

2.3 Grid resolution & cell counts

• Typical engineering cases: ~0.4 to 2 million cells for external aerodynamics
• Refinement near the body and regions of strong gradients
• Automatic grid generation motivated by SameDayCFD: setup in minutes, not days

3.1 Spatial discretization

• Finite-volume formulation on a Cartesian grid
• Flux-vector splitting scheme for robust capture of shocks and expansion waves
• Upwind-biased discretization for convective terms

3.2 Temporal discretization

• Time-marching approach to reach steady or quasi-steady solutions
• Local time-stepping to accelerate convergence where appropriate
• Monitoring of global coefficients (CL, CD, CM) to determine convergence

3.3 Parallel execution

• Shared-memory parallelism using multiple cores on a single Windows machine
• Performance scales with number of cores and available RAM

4.1 Mach number & flow regimes

• Subsonic, transonic and supersonic flows
• Typical external-aerodynamics Mach range from low subsonic up to M ≈ 5 (recommended)

4.2 Angles & attitudes

• Angle of attack from 0° to high-incidence / post-stall conditions (case-dependent)
• Crossflow / sideslip angle from 0° to 360° for stability-type analyses

4.3 Actuator disk modeling

• Up to 100 actuator disks to represent propellers, fans, jets or rocket plumes
• Disks specified by location, orientation and imposed momentum source
• Useful for studying propulsion–airframe interaction without resolving blade geometry

4.4 Rotational and stability-type effects

• Surface rotation capability for quasi-steady stability-derivative studies
• Rotations about arbitrary axes to mimic pitch, roll or yaw motions
• Useful for estimating aerodynamic damping and control effectiveness

5.1 External aerodynamics

• Far-field boundaries based on free-stream conditions (Mach, pressure, temperature, flow direction)
• Solid surfaces treated as no-slip, adiabatic walls for viscous RANS solutions
• Symmetry planes available for appropriate configurations

5.2 Domain extents

• Cartesian domain automatically generated around imported geometry
• User can adjust domain size to reflect specific wind-tunnel or free-flight conditions

6.1 Geometry input

• STL file input from:
  • NASA OpenVSP
  • Common CAD packages via STL export
• Built-in parametric wing and surface tools for certain configurations

6.2 Quantities of interest

• Global aerodynamic coefficients:
  • Lift, drag, side force
  • Pitching, rolling and yawing moments
  • CL, CD, CY, Cm, Cl, Cn
• Component force and moment breakdowns for user-defined surfaces

6.3 Field and surface data

• Pressure, Mach number, velocity, density and temperature on:
  • STL surfaces (contour plots)
  • Cartesian slices (constant x, y or z planes)
• Line plots of Cp and other variables along user-selected cuts (e.g., wing stations)
• Streamline visualization colored by pressure, Mach or other variables

6.4 Data export

• Export of surface and volume data for external visualization (e.g., ParaView workflow)
• Export of tabulated force, moment and coefficient histories for reports or spreadsheets

7.1 Operating system & hardware

• Microsoft Windows 7, 10 or 11
• Desktop, laptop or compatible tablet
• Multiple cores recommended for faster turnaround
• Memory requirements depend on grid size; more RAM allows larger cases

7.2 Licensing options

• 3-month subscription
• 1-year subscription
• Perpetual licence

For current pricing and purchase links, please see the main Stallion 3D product page.

7.3 Support & consulting

• Technical support by email and phone
• Custom training, consulting and project-specific studies available

📞 Call or text (352) 653-0875 or email hanley@hanleyinnovations.com to discuss specific technical requirements or validation needs.