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Using k-ω model is difficult for ____________

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in Computational Fluid Dynamics by (118k points)
Using k-ω model is difficult for ____________

(a) free stream

(b) boundary layer flows

(c) jet flows

(d) mixing layer flows

I had been asked this question in an interview for internship.

This intriguing question originated from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

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Correct option is (a) free stream

To elaborate: The k-ω model is sensitive to the free stream specified values. The value of ω in the free stream is zero. But, if this is set to zero, the eddy viscosity becomes infinity or indeterminate. So, a small non-zero value is specified and the whole problem becomes dependent on this non-zero value. The k-ε model does not have this problem.

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