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Which of these problems may occur because of the hybrid nature of the Shear Stress Transport model?

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Which of these problems may occur because of the hybrid nature of the Shear Stress Transport model?

(a) Non-linearity

(b) Inconsistency

(c) Numerical instability

(d) Inaccuracy

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The above asked question is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

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Right answer is (c) Numerical instability

The explanation: As the modelling equations vary from the converted k-ω model in the near-wall region to the standard k-ω model in the far away region, numerical instabilities may arise in the computed eddy viscosities.

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