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If we are solving a k-ε model, the values of k and ε _________

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If we are solving a k-ε model, the values of k and ε _________

(a) are either specified or estimated at the inlet

(b) are either specified or estimated at the outlet

(c) need not be specified or estimated anywhere

(d) are not estimated

I have been asked this question in homework.

The query is from Boundary Conditions topic in chapter Boundary Conditions of Computational Fluid Dynamics

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Correct answer is (a) are either specified or estimated at the inlet

The best explanation: The most accurate solutions can be achieved only if k and ε are specified at the inlet boundary. However, if it is not possible to provide, CFD codes can estimate these values using a formula.

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