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This paves the way for dropping in other LBM collision models.
As a side benefit the default momenta calulcation is now fully inlined where possible.
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No guarantee for correctness - I mostly fiddled this together in order
to use common nixpkgs python package functions for including boltzgen
in other shell environments.
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Still thinking how various collision models (BGK, MRT and so on) may be
nicely abstracted in this setting.
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It's time to extract the generator-part of my GPU LBM playground and turn it
into a nice reusable library. The goal is to produce a framework that can be
used to generate collision and streaming programs from symbolic descriptions.
i.e. it should be possible to select a LB model, the desired boundary
conditions as well as a data structure / streaming model and use this
information to automatically generate matching OpenCL / CUDA / C++
programs.
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