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12.19.5 Differential Viscosity Modification

In the RNG turbulence model in FLUENT, you have an option to use a differential formula for effective viscosity $\mu_{\rm eff}$ (Equation  12.4-6) to account for low-Reynolds-number effects. To enable this option, turn on Differential Viscosity Model under RNG Options in the Viscous Model panel.

(This option will not appear unless you have activated the RNG $k$- $\epsilon$ model.)

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