Troops: I have responded with grades for PE 6 submitted. By and large work was well done - some was exceptionally complete. It is obvious that many of you do not know how to non-dimensionalize the NS PDE system, and also are rusty with vector calculus Those not submitting this exercise earned a score of 0/8. Hopefully you learned something about fluid mechanics and turbulence from this exercise ! The archive is open. AJB