Basic HTML version of Foils prepared 10 November 1995

Foil 33 Length scales and Averaging used in the Reynolds Averaged Equations or Reynolds Equation

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox
Very small length scales dL are present in "turbulent regions" maybe need to resolve a size
dL ~ 10-3L
If dL covered by 10 grid points then leads to 104 grid points in each linear dimension L which is impossible
So "average" over fine length scales (~10-3 cm) and write a new set of macroscopic equations.

© on Tue Oct 7 1997