hey Camoesas!

in the routine you posted, yPlusTherm, yPlus where the linear and the log law intersect, is calculated with the help of Newton's method. the function "f" is the difference of the linear function (laminar sub-layer) and the log-function which becomes zero for ypt = yPlusTherm.

VSMALL is a very small number mostly used in the denominator of a quotient to avoid a division by zero.

hope that helps!

cheers,
aram

HI Aram!

Thanks for your fast Reply!
I got that, but why do i have the turbulent Prandtl-number (Prat) in the denominator? Equation for f? The jayatilleke Wall function in the enominator!
What kind of function for the thermal laminar sublayer is used? It seems that it simply is: T+ = y+ , shouldnt it be something like T+ = y+ * Pr_l ???

Thanks!

Camoesas