Introductory FLUENT Notes Fluent User Services cente ANSYS LUENT v6. 3 December 2006 wwfluentusers. com FLUENT Large eddy simulation Large Eddy Simulation (LEs LES has been most successful for high-end applications where the rans models fail to meet the needs. For example Combustion Mixing External Aerodynamics(flows around bluff bodies) Implementations in FLUENt Subgrid scale(SGs) turbulent models Smagorinsky-Lilly model Wall-Adapting Local Eddy-Viscosity WALE Dynamic Smagorinsky-Lilly model Dynamic Kinetic Energy Transport Detached eddy simulation(DES)model 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) Before running LES, consult guidelines in theBest Practices For LES (containing advice for meshing, subgrid model, numerics, BCs, and more) C 2006 ANSYS. nc All ANSYS, Inc. Proprietar© 2006 ANSYS, Inc. All rights reserved. 6-14 ANSYS, Inc. Proprietary Fluent User Services Center www.fluentusers.com Introductory FLUENT Notes FLUENT v6.3 December 2006 Large Eddy Simulationn ◆ Large Eddy Simulation (LES) ⚫ LES has been most successful for high-end applications where the RANS models fail to meet the needs. For example: ◼ Combustion ◼ Mixing ◼ External Aerodynamics (flows around bluff bodies) ◆ Implementations in FLUENT: ⚫ Subgrid scale (SGS) turbulent models: ◼ Smagorinsky-Lilly model ◼ Wall-Adapting Local Eddy-Viscosity (WALE) ◼ Dynamic Smagorinsky-Lilly model ◼ Dynamic Kinetic Energy Transport ⚫ Detached eddy simulation (DES) model ◆ 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). ◆ Before running LES, consult guidelines in the “Best Practices For LES” (containing advice for meshing, subgrid model, numerics, BCs, and more)