Roy,
The article is interesting, even though I cannot follow the math. It seems to improve on CFD calculations in the Knudsen layer between liquid and vapor layers near walls beyond the slip-flow regime. I am not sure what all that means, but it sounds like it could have application to explaining the humidity dependency that I may have found when the temperature gets close to the dewpoint temparature.
I am sure that Jari is not working in that area, but he may eventually get into it once he has got the broad outline of the rear-facing step worked out.
Jari, check out the link below.
Best regards,
Jim
greatly improves the near-wall accuracy of the Navier-Stokes-Fourier
equations, well beyond the slip-flow regime.