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What are the shortcomings of DNS?

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What are the shortcomings of DNS?

(a) Possible for low Reynolds number

(b) Low scale resolution

(c) Time consuming

(d) Possible for high Reynolds number

This question was posed to me in an interview.

My query is from Turbulence Modelling topic in portion Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics

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Correct option is (a) Possible for low Reynolds number

Explanation: The DNS solves the time – dependent Navier’s Stokes equation by resolving eddies of all scales for a sufficient time before reaching statistical equilibrium. The only shortcoming is that DNS is only applicable for low Reynolds number flow which has simple geometry.

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