Sounds like you've been doing some homework.
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CAUTION:
In automotive work, CFD is required to 'solve' the entire flow domain, not only the near-field around the vehicle, but also the far-field up to 2-meters away, in all directions, except underneath. This is where the computing penalty rears it's ugly head.
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This is where I think OpenVDB shows benefit.
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https://github.com › AcademySoftwareFoundation › openvdb
GitHub - AcademySoftwareFoundation/openvdb: OpenVDB - Sparse volume ...
OpenVDB is an open source C++ library comprising a novel hierarchical data structure and a large suite of tools for the efficient storage and manipulation of sparse volumetric data discretized on three-dimensional grids. It was developed by DreamWorks Animation for use in volumetric applications typically encountered in feature film production.
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