•Characterization of Turbulent Flows
•From Navier-Stokes
Equations to Reynolds-Averaged Navier-Stokes (RANS) Models
•Reynolds Stress Tensor and the Closure
Problem
•Turbulence Kinetic Energy (k)
Equation
•Eddy Viscosity Models (EVM)
•Reynolds Stress Model
•Near-wall Treatments Options and Mesh
Requirement
•Inlet Boundary Conditions
•Summary: Turbulence Modeling Guidelines
•Appendix
•Inherently unsteady, three dimensional and aperiodic swirling motions (fluctuations) resulting in enhancement of
mixing, heat transfer and shear.
•
•Instantaneous fluctuations are random
(unpredictable) both in space and in time. But statistical averaging
of turbulence fluctuations results in accountable transport mechanisms
•
•Wide range of length scales (vortices or
eddies) exist in all turbulent flows (from very small to very large).
•
Very sensitive to (or dependent on) initial
conditions. 
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