RT Journal Article ID 3eb9bd6f53506704 A1 Brima, Abdelhafid A1 Atmani, Rachid A1 Achour, Bachir T1 Theoretical Approach on the Study of Turbulent Water Flow over Smooth and L-shaped Riblets Surfaces JF International Journal of Fluid Mechanics Research JO FMR YR 2008 FD 2008-09-25 VO 35 IS 2 SP 163 OP 172 AB A very important research effort has been developed at many world laboratories these last years in order to reduce the friction drag. For the aircraft and the submarine applications, friction contributes respectively for about 50% and 70% of the total resistance. The use of surface modifications riblets as a means of reducing viscous drag on a body has potential aerodynamic and hydrodynamic applications. In the present study, the theoretical approach allow to determine the velocity field, the wall shear stress, the local skin friction, the boundary layer thickness, the laminar sub layer thickness and the dimensionless drag coefficient. The results found, indicate that the presence of L-shaped riblets surfaces provide changes in the characteristics of the turbulent boundary layer, which are in favor of wall skin friction. PB Begell House LK https://www.dl.begellhouse.com/journals/71cb29ca5b40f8f8,1c5c69e843fb8710,3eb9bd6f53506704.html