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Which of these terms represent the burst of turbulent activity to the outer region?

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Which of these terms represent the burst of turbulent activity to the outer region?

(a) Crisis

(b) Intermittency

(c) Turbulent burst

(d) Turbulent jumps

The question was posed to me by my school principal while I was bunking the class.

Question is taken from Free and Wall Turbulence in division Turbulence Modelling of Computational Fluid Dynamics

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The correct choice is (b) Intermittency

The best explanation: Intermittency is the irregular alteration of phases. In turbulent flows, it is seen in the irregular alteration between the turbulent and non-turbulent region of jet flow. Intermittency represents the burst of turbulent activity to the surrounding region.

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