A computer program has been written to calculate the two-dimensional development of a turbulent boundary layer over both smooth and rough surfaces. Its performance is judged against published data on the growth of eight boundary layers. The calculation procedure uses the two-paramenter method of Granville (1975) and contains the rough wall model by Dvorak (1969) to include the effects of rough surfaces.
The model by Granville is a poor predictor of the boundary layer development over smooth walls for equilibrium and near-equilibrium flows. The calculation of the rough wall case is poor.