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Which of these scientists introduced turbulent viscosity?

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Which of these scientists introduced turbulent viscosity?

(a) Kolmogorov

(b) Smagorinsky

(c) Prandtl

(d) Boussinesq

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My doubt is from Turbulent Viscosity in division Turbulence Modelling of Computational Fluid Dynamics

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Correct answer is (d) Boussinesq

To explain I would say: Boussinesq introduced the concept of eddy viscosity or turbulent viscosity in turbulent flows. Boussinesq equated the turbulent stresses to the mean flow. Here, the new constant of proportionality called the turbulent viscosity was introduced.

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