THEORETICAL APPROACH ON THE STUDY OF TURBULENT WATER FLOW OVER SMOOTH AND L-SHAPED RIBLETS SURFACES
Résumé
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.
Un effort très important a été fourni ces dernières années à travers les laboratoires du monde dans le domaine de la réduction
de traînée visqueuse. Pour les avions de transport et les sous marins, la traînée visqueuse contribue respectivement d’environ
50% à 70% de la résistance totale. L’utilisation des modifications au niveau de la surface est un moyen efficace pour réduire la
traînée visqueuse dans les applications aérodynamique et hydrodynamique. Dans cette étude, l’approche théorique permis de
déterminer le champ de vitesse, la contrainte de cisaillement à la paroi, le coefficient de frottement local, l’épaisseur de la
couche limite, l’épaisseur de la sous couche visqueuse et finalement le coefficient non dimensionnel de traînée sont
représentés. Les résultats trouvés ont montré que la présence des rainures en lames " L " fournie des changements dans les
caractéristiques de la couche limite turbulente, qui sont en faveur du coefficient de frottement pariétal.
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