Abstract:

To investigate a coastal flow in the vicinity ofa porous obstacle, several approaches are proposed such as CFD computational fluid dynamics and/or theoretical calculations based on Navier - Stokes equations. With the non - stop development of information technology, there are many turbulence models suggested to solve this current such as Standard k - , Wilcox k - , SST k - …etc. In which, the SST k - model has proved its efficiency in solving problems related to this type of flow. Besides, in order to characterize the emmerged structure in marine environment, the theory of porous media is utilised. In this study, the effective drag coefficient Cnet ofthe porous obstacle varies from 0 to infinity to minic a vas range ofporosity of this object. Results of numerical simulations enable us to confirm a separation of the flow and a declination of its velocity within the porous structure and allow us to witness the apperance of a recirculation cell at the rear of the structure when Cnetreaches a critical value. Thus, velocities or flowrates inside and below the porous medium could be estimated. For the sake of accuracy and realiability of the numerical simulations, these results are then compared to relevant studies and to some theoretical calculations