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Which of these is the simplest type of turbulent flows?

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Which of these is the simplest type of turbulent flows?

(a) Homogeneous anisotropic turbulence

(b) Incompressible turbulent flows

(c) Homogeneous isotropic turbulence

(d) Compressible turbulent flows

I have been asked this question in homework.

My doubt is from Direct Numerical Solution for Turbulent Models topic in section Turbulence Modelling of Computational Fluid Dynamics

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The correct answer is (c) Homogeneous isotropic turbulence

The best I can explain: The homogeneous isotropic turbulence is the simplest model of turbulence problems. It just needs a uniform grid to simulate the flow. However, the number of grids depends upon the Reynolds number of the flow.

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