Question

The Smagorinsky-Lilly (Sub-Grid-Scale) SGS model uses ___________

(a) Boussinesq hypothesis and Prandtl mixing length model

(b) Prandtl mixing length model and k-ε model

(c) k-ε model and k-ω model

(d) k-ω model and Boussinesq hypothesis

This question was posed to me in an online interview.

Query is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

The correct answer is (a) Boussinesq hypothesis and Prandtl mixing length model

To elaborate: The Smagorinsky-Lilly (Sub-Grid-Scale) SGS model is built on the Prandtl mixing length model and models the SGS eddy viscosities. It uses the Boussinesq hypothesis to assume the effects of the SGS eddies.