Abstract
The implementation of the finite volume mesh can follow many directions whether in the definition of the mesh fields, the storing of the variables, or even in determining the connectivity relations. This chapter aims at outlining the design decisions that shape the implementation of two CFD codes, uFVM an educational unstructured Finite Volume code and OpenFOAM® an industrial-strength open source code. The two codes are thus presented, initially in terms of their data structure and memory management schemes, and then in terms of how cases are setup. Finally the format of the system of equations generated by each of the two codes are detailed. The reader will notice that while uFVM shares many of the implementation details with OpenFOAM®, its simplicity allows for the use of simpler implementation techniques and data structure.
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