Modeling Turbulent Flows. What is Turbulence?. Unsteady, irregular (aperiodic) motion in which transported quantities (mass, momentum, scalar species) fluctuate in time and space Identifiable swirling patterns characterizes turbulent eddies.
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along a surface
L = x, D, Dh, etc.
around an obstacle
Other factors such as free-stream turbulence, surface conditions, and disturbances may cause earlier transition to turbulent flow.
tRANS Modeling - Ensemble Averaging
n identifies the ‘sample’ ID
whereare the Reynolds Stresses.
Direct Numerical Simulation
in FLUENT 6
u+Modeling the Near-Wall Region
inner layerNear-Wall Modeling Options
whereStandard and Non-Equilibrium Wall Functions
Inviscid, Laminar, or Turbulent
Turbulence Model options
Near Wall Treatments
Additional Turbulence options