Question

The velocity of a free turbulent flow at any particular distance in the cross-stream direction is a function of ___________

(a) The ratio of the distance in the cross-stream direction from the centreline and half-width at that cross section

(b) The source velocity

(c) The cross-stream velocity of the source

(d) The velocity in the flow direction of the source

The question was posed to me during an interview.

Question is from Free and Wall Turbulence topic in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Correct option is (a) The ratio of the distance in the cross-stream direction from the centreline and half-width at that cross section

Easiest explanation: The velocity at any point in the cross-stream direction at a particular cross section depends on the ratio of the distance from the centreline and the half width of the cross-stream.