SG2218 â 2012 Turbulence models for CFD SG2218 â 2012 ... - KTH

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Example – stagnation flow

Flow around a wing profile – leading edge

• Turbulence kinetic energy shown

• Std. Eddy-viscosity models – excessive production of K

• Cured by ”SST”

Std. k-

SST k-

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Modelling of production Exact: Model: • Strain rate dependency – Exact – linear dependency: – Model – quadratic dependency: • What is the consequence – No problem in equilibrium flows – Stagnation flows: turbulence overpredicted -> e.g. heat transfer in stagnation regions – Separated flows: turbulence overpredicted -> separation size typically underpredicted • How to improve: Menter SST – Limit turbulence viscosity

Example – stagnation flow Flow around a wing profile – leading edge • Turbulence kinetic energy shown • Std. Eddy-viscosity models – excessive production of K • Cured by ”SST” Std. k- SST k-

Page 1 and 2: SG2218 - 2012 Turbulence models for
Page 3 and 4: The K - model
Page 5 and 6: The K - model - problems Unphysica
Page 7: Turbulent boundary layer
Page 11 and 12: Rotating turbulent channel Increasi
Page 13 and 14: Reynolds stress models (RST or DRSM

SG2218 â 2012 Turbulence models for CFD SG2218 â 2012 ... - KTH

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