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Which of these is correct when the turbulent Prandtl number is unity?

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in Computational Fluid Dynamics by (118k points)
Which of these is correct when the turbulent Prandtl number is unity?

(a) Turbulent diffusivity is zero

(b) Turbulent viscosity is zero

(c) The flow becomes laminar

(d) The velocity and temperature profiles are identical

The question was asked in exam.

This intriguing question originated from Turbulent Schmidt Number in portion Turbulence Modelling of Computational Fluid Dynamics

1 Answer

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The correct answer is:

(d) The velocity and temperature profiles are identical

When the turbulent Prandtl number is unity, the turbulent diffusivity of momentum and heat are equal. This results in identical velocity and temperature profiles in the flow.

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