Transcription of Modeling Turbulent Flows Introductory FLUENT Training
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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. Large eddies derive energy from the mean flowzEnergy is transferred from larger eddies to smaller eddies In the smallest eddies, Turbulent energy is converted to internal energy by viscous 2006 ANSYS, Inc.
LES is applicable to all combustion models in FLUENT Basic statistical tools are available: Time averaged and RMS values of solution variables, built-in fast Fourier transform (FFT).
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