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When k and ε values are not available, for inlet boundary conditions, they are ____________

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When k and ε values are not available, for inlet boundary conditions, they are ____________

(a) obtained from turbulence intensity

(b) assumed to be zero

(c) assumed to be unity

(d) obtained from Reynolds number

The question was posed to me in an international level competition.

My doubt is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

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The correct answer is (a) obtained from turbulence intensity

Explanation: At the inlet boundary conditions, the k and ε values must be specified for the k-ε model. In most of the industrial CFD applications, these values will not be known. So, they are obtained from the turbulence intensity and the characteristic length of the model.

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