This chapter contains an overview of the resolution setup for various types of vehicles in ultraFluidX. These best practices have been derived using industry standard/public models, as well as client project experience. We are continuing efforts to improve upon our best practices and review them each release. For an overview on ultraFluidX and the requirements needed to run the solver, please refer to the Altair ultraFluidX 2021.1 User Guide.

The current guide includes:

  • Wind Tunnel Setup
    • Tunnel definition and floor boundary conditions
    • Domain size and blockage ratio
    • Inflow Mach number and run time
  • Refinement Strategy for Passenger Vehicles
    • Box refinement zones
    • Offset refinement zones
    • Custom refinement zones
    • Recommendations for certain boundary conditions
      • Wheels
      • Porous media
      • Belts and tunnel suction resolution
    • Considerations for specific vehicle types
      • Considerations for hatchbacks/compacts/estates
      • Considerations for sedans/coupes/fastbacks
      • Considerations for SUVs/pickup trucks/vans
  • Refinement Strategy for Commercial Heavy Trucks

The best practices presented in this chapter are vehicle-type-dependent. In the first sections, we will focus first on passenger cars, and then motorcycles and commercial trucks in separate sections. For passenger cars, we will make a note of what to do for sedan-like vehicles with a slanted roof, hatchback-like vehicles with a defined separation edge, and larger vehicles (SUVs, vans, and so on). For commercial trucks, we will make a note of different tractor design types (cab-over, long-nose) and how to handle them.