Question

The Shear Stress Transport model is a hybrid of _________

(a) the standard k-ε model and the k-ω model

(b) the standard k-ε model and the RNG k-ε model

(c) the realizable k-ε model and the RNG k-ε model

(d) the realizable k-ε model and the k-ω model

The question was asked in an interview for internship.

Asked question is from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Right answer is (a) the standard k-ε model and the k-ω model

For explanation I would say: For boundary layers with adverse pressure gradients, the standard k-ε model does not perform well. To overcome this problem, the other models were devised. But, those are sensitive to the arbitrary constants used. So, the Shear Stress Transport model combines the standard k-ε model and the k-ω model to get the advantages of both.