Relevant "help-file" entries are :- WALLA, WALLCO, WALLS, WALL, WALPRN.

The FORTRAN coding for the wall-functions may be found in the file GXWALL.

H.Grotjans & F.R.Menter, "Wall functions for industrial applications" In Proc. of CFD’98, ECCOMAS, 1(2), Papailiou KD (Ed.). Wiley: Chichester, UK, 1112–1117, (1998).
C.L.V Jayatillike, 'The influence of the Prandtl number and surface roughness on the resistance of the sublayer to momentum and heat transfer', Prog. in Heat & Mass Transfer, Vol.1, Pergamon Press, (1969).
B.E.Launder and D.B.Spalding, 'The numerical computation of turbulent flow', Comp. Meth. in Appl. Mech. & Engng., Vol.3, p269, (1974).
M.R.Malin and J.D.Parry,'Turbulent heat and momentum transfer in rough tubes', PHOENICS Journal, Vol.1, No.1, p81, (1988).
P.J.Richards & R.P.Hoxey, "Appropriate boundary conditions for computational wind engineering models using the k-ε turbulence model." J.Wind Engng & Industrial Aerodynamics, 47, 145-153, (1993).
H.I.Rosten and J.K.Worrell, 'Generalised wall functions for turbulent flow', PHOENICS Journal, Vol.1, No.1, p81, (1988).
H.Schlichting,"Boundary-Layer Theory", McGraw Hill (1968).

Relevant "help-file" entries are :- DISWAL, EL1, EL1A, EL2, EL2A, EN ENUTA, GENK, KELIN, PRT, TURBUL, TURMOD.

Further relevant "Encyclopaedia" entries include EGWF and LTLS.

See also the lectures on turbulence models in POLIS for more information.