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To close the RANS equations, we need _____________

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in Computational Fluid Dynamics by (118k points)
To close the RANS equations, we need _____________

(a) Incompressible flow model

(b) DNS method

(c) Turbulence models

(d) SGS model

This question was addressed to me during a job interview.

The query is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

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The correct choice is (c) Turbulence models

To explain I would say: It is impossible to derive a closed set of RANS equations. So, some approximations in the flow model are done. These approximations are called the turbulence model. This usually means prescribing the Reynolds stresses and turbulent scalar flux in terms of the mean flow quantities.

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