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Webinar High-Fidelity, High-Speed CFD

Land-Speed Record Attempt Uses High-Fidelity, High-Speed CFD

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[29 Apr 2015] In 1963, Craig Breedlove set the world land-speed record in the Spirit of America, a record that he would later reclaim several more times in the next two years. Fifty years later, Breedlove has decided that it is time to bring the title back to America. In a new team led by Breedlove, the Spirit of America is being revived with the goal of once again claiming a new world record for land-speed vehicles.

Historically, land-speed vehicles were shaped by rule of thumb aerodynamics. However in the 50 years since the first turbojet vehicle officially set a land-speed record, computational fluid dynamics (CFD) has matured to a point where it can be inexpensively used to help simulate performance characteristics on such vehicles. One of the largest initial hurdles for Breedlove and his team has been quickly analyzing new designs with limited resources. To that end, TotalSim agreed to help with the preliminary CFD analysis given a restricted budget. The key to success for both parties was generating inexpensive accurate results.

Leveraging Pointwise, TotalSim generated a hybrid grid, balancing mesh generation time and solution accuracy. Pointwise's structured and unstructured meshing techniques coupled with T-Rex (anisotropic tetrahedral extrusion) were used to generate layers of unstructured hexahedra and prisms, helping to reduce the overall cell count and improve grid quality. Additionally, TotalSim was able to exploit the flexibility of Pointwise and manually adapt the grid to help resolve shock structures and more accurately predict vehicle performance.

Discover how to:

  • Simplify a complex geometry using layers for organization
  • Resolve areas of high curvature using structured meshing techniques
  • Automatically generate contiguous viscous layers of unstructured hexahedra and prisms
  • Effortlessly add local refinement to an existing volume mesh to improve solution accuracy
  • Rapidly assess high-speed vehicle performance on a limited budget



Prisms and hexahedral elements coexisting in the same grid

Using the latest version of T-Rex, prisms and hexahedral elements can coexist in the same grid. Note the near-field hybrid block matches point-for-point the outer structured block. The inset image displays the pressure contours on the surface of the vehicle as it operates at transonic speeds.

Surface shear stress contours operating at transonic speeds

A viscous CFD solution on the Spirit of America illustrating the surface shear stress contours operating at transonic speeds. Solved with CFD++.

Watertight hybrid surface mesh

A watertight hybrid surface mesh was created consisting of both structured and unstructured domains. T-Rex was used to march layers of prisms and unstructured hexahedra to form the viscous region of the grid followed by tetrahedra in the near-field block.

Description Format File Name File Size [MB]
Webinar Video File WMV Pointwise-Webinar-Land-Speed-Record-Attempt-with-CFD.wmv 29