OpenFOAM-6/tutorials/multiphase/interFoam/ras/waterChannel

- This case uses blockMesh and extrudeMesh to create a channel geometry.
  - See Allrun script to generate geometry.
- The case is set up to run with interFoam.
- For running with LTSInterFoam, an alternative set of main files from
  system directory (controlDict, etc) are included in LTSInterFoam
  subdirectory to replace the existing files set up for interFoam.