Using k-ω model is difficult for ____________(a) free stream(b) boundary layer flows(c) jet flows(d) mixing layer flowsI 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

Using k-ω model is difficult for ____________(a) free stream(b) bound

1.	Using k-ω model is difficult for ____________(a) free stream(b) boundary layer flows(c) jet flows(d) mixing layer flowsI 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
Answer» 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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