In this tutorial we implement the k-epsilon turbulence model in openFoam, with the pisoFoam application. The mesh is of a 2D flow through 2 parallel plates, with a square cylinder in the middle of the flow domain.
See github.com/meinarsve/CFDwOpen... to access the case files, and PDF-document explaining the relevant theory.
Feel free to post any questions in the comments, and I will try to answer to the best of my effort.