The Risø Smooth-Terrain Model

Wind & Water Inflow Turbulence
1

Hi everyone,
In Risø Smooth-Terrain Model,What does the ΦA and ΦE stand for and what are their expressions ?

2

I don’t have my notes on these models anymore, but the code documents the two values as follows:

phiM = 1.0 + 4.7*zL ! Non-Dimensional Wind Shear phiE = (1.0 + 2.5*zL^0.6)^(3/2) where zL is a stability parameter based on RICH_NO:

if (RICH_NO <= 0) zL = RICH_NO else if (RICH_NO <= 1/6) zL = RICH_NO / ( 1 - 5*RICH_NO ) else zL = 1 end

3

Thank you for your reply.