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This is the Gracht 2D Lattice Boltzmann Solver project ("gracht")
This project is hosted by SourceForge.net. The project team describes it as:
Gracht is a open source 2D Lattice Boltzmann (BGK) fluid flow solver written in C. Gracht is meant to be a code that is easy to learn, well documented, and supported for the purpose of teaching and as a platform for sharing ideas.
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