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Large turbulent eddies extract energy from the mean flow by this process.

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in Computational Fluid Dynamics by (118k points)
Large turbulent eddies extract energy from the mean flow by this process.

(a) Energy decomposition

(b) Eddy extracting

(c) Vortex stretching

(d) Substantial variation

I got this question in an online interview.

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

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Right choice is (c) Vortex stretching

The best I can explain: Vortex stretching is the lengthening of vortices with a corresponding increase in the component of vorticity in the stretching direction. This vortex stretching is responsible for the largest turbulent eddies to interact with the mean flow and extract energy from them.

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