Guideline for reasonable k-eps boundary-conditions?
does a reasonable guideline for setting k, eps, nut, nutilda boundary-conditions related to the given problem? (e.g. zeroGradient, fixedValue, if fixed, what quantitative value, etc.). What types of BC can be used, anyway for pipe-flow, free-stream convection, etc?
I would be nice to have a guideline to have a reasonable start before exploring the solution sensitivity to the given BC.
For external flows there is an informative paper by Spalart:
Philippe R. Spalart, Christopher L. Rumsey:
Effective Inflow Conditions for Turbulence Models in Aerodynamic Calculations, AIAA Journal vol. 45, no. 10, 2007
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