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Modeling Turbulent Flows Introductory FLUENT Training

2006 ANSYS, Inc. All rights , Inc. ProprietaryModeling Turbulent FlowsModeling Turbulent FlowsIntroductory FLUENT TrainingIntroductory FLUENT Training6-2 2006 ANSYS, Inc. All rights , Inc. ProprietaryFluent User Services December 2006 What is turbulence ? Unsteady, irregular (aperiodic) motion in which transported quantities (mass, momentum, scalar species) fluctuate in time and spacezIdentifiable swirling patterns characterize Turbulent mixing (matter, momentum, energy, etc.) results Fluid properties and velocity exhibit random variationszStatistical averaging results in accountable, turbulence related transport characteristic allows for turbulence Modeling . Contains a wide range of Turbulent eddy sizes (scales spectrum).zThe size/velocity of large eddies is on the order of mean flow.

The k–ωTurbulence Models The k–ωfamily of turbulence models have gained popularity mainly because: zThe model equations do not contain terms which are undefined at the wall, i.e. they can be integrated to the wall without using wall functions. zThey are accurate and robust for a wide range of boundary layer flows with pressure gradient.

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