If n is the spatial coordinate, in the outlet or symmetry boundaries, which of these following is correct for a k-ε model?
(a) \(\frac{\partial k}{\partial n}=0; \frac{\partial\varepsilon}{\partial n}=0\)
(b) \(\frac{\partial^2 k}{\partial n^2}=0; \frac{\partial\varepsilon}{\partial n}=0\)
(c) \(\frac{\partial k}{\partial n}=0; \frac{\partial^2 \varepsilon}{\partial n^2}=0\)
(d) \(\frac{\partial ^2 k}{\partial n^2}=0; \frac{\partial^2 \varepsilon}{\partial n^2}=0\)
This question was addressed to me in an interview for internship.
Asked question is from Turbulence Modelling in section Turbulence Modelling of Computational Fluid Dynamics