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The only CFD that will 'solve' an automobile completely is the 3D, Full Navier-Stokes Equations for viscous flows, plus a turbulence model.
The billions of cells required are presented in a spherical-coordinate system, with the vehicle at the 'center of the universe.'...
Cartesian grids can't do it.
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That's what I'm saying. With OpenVDB more distance cells are 'larger'. Each volex can have
n attributes attached and available for computation.
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Point Clouds and Tools
OpenVDB can natively store point data within its hierarchy using PointDataGrids. These grids can store the points with attributes directly in the VDB Grid. Points are spatially-organized into VDB voxels to provide faster access and a greater opportunity for data compression compared with linear point arrays.
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https://www.openvdb.org/about/
'CFD' encompasses the algorithmic pseudocode to implement Botlzman or Navier-Stokes [whichever] and the the dataspace where the computation takes place. Open VDB offers the latter.