The main objective of this paper is to study the behaviour of turbulent boundary layer regarding the surface roughness. The existing theoretical and empirical methods Ag well as various experimental results have been reviewed and studied. A new simplified methodology is suggested to take into account the different behaviour parameters of boundary layer, Tire effect of such parameter and velocity profiles are well defined and given in the form of design charts. Moreover, using these design charts & proposed numerical procedure is introduced to solve the momentum equation of turbulent flow over rough surface with the help of isocline method.
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