Basic structure

OpenFOAM, a collection of C++ header files and libraries, allows for many customization for a CFD analysis. The files, are usually strutured in three directories as 0, constant and system.

1. 0 folder includes the settings for the initial and boundary conditions for the flow that is analysed.

2. The files in constant directory defines the material properties of the fluid used for the simulation. The mesh also gets stored in this directory by the sub-directory polyMesh here.

3. The system folder includes codes to control various setttings of the simulation.

   1. system/blockMeshDict controls the mesher blockMesh.

   2. system/decomposeParDict controls the mesh for a parallel run within the code.

   3. system/controlDict controls the simulation paramters such as, solver, endTime, writeInterval etc.

   4. system/fvSolution controls the iterative pressure-velocity coupling setting.

   5. system/fvSchemes controls the numerical scheme within the solver.

4. The solver runs in the following order.

This may of course vary depending on application and solver requirements, but the chain of editing the files would remain roughly in the order mentioned above.