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Direct Numerical Simulation of turbulent flows become difficult because of ____________

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in Computational Fluid Dynamics by (118k points)
Direct Numerical Simulation of turbulent flows become difficult because of ____________

(a) Viscosity scales

(b) Time and length scales

(c) Energy scales

(d) Velocity scales

I have been asked this question in an international level competition.

My question is based upon Turbulence Modelling topic in section Turbulence Modelling of Computational Fluid Dynamics

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Correct choice is (b) Time and length scales

To elaborate: High fluctuation in turbulent flows result in a broad range of length and time scales. This makes the Direct Numerical Simulation (DNS) of turbulent flows difficult. It imposes a limitation to the DNS method.

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