Separate HTML for Basic Foil 34 Turbulence Modeling and the Nature of Reynolds Averaging in Continuum Physics

Basic HTML version of Foils prepared 10 November 1995

Foil 34 Turbulence Modeling and the Nature of Reynolds Averaging in Continuum Physics

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox

Note: We have already averaged to get Navier-Stokes. There we used "fundamental physics" and 10-8 cm basic dL. ( actually this "fundamental average" averages over quantum effects over length scales of 10-13 cm )

So Reynolds averaging is a "new average"

The Reynolds averaged equations need TURBULENCE MODELING done by mix of the theoretical analysis and experimental observations.

The Reynolds Averaging Procedure at its simplest gives back the Navier-Stokes Equations with changed parameters (such as viscosity) and additional external force terms. These are estimated by turbulence modelling. The most sophisticated treatments add one or two additional differential equations to be solved.