THREE-DIMENSIONAL FEATURES OF THE TURBULENT FLOW AROUND SERIES OF GROYNES WITH DIFFERENT SHAPES OF HEAD

Abstract

In the present study, three-dimensional flow structure around two simple series of groynes with different shapes of head was investigated using a numerical model known as SSIIM. The model solved the fully three-dimensional, RANS equation to simulate flow upstream, downstream of the groynes as well as their embayment in which a fully complex 3D flow is governing. Two case studies were considered: a simple series of straight groynes and a simple series of groynes with T-shape head. The reattachment length was computed and by illustrating the hydrodynamic of flow at different longitudinal, transverse and vertical sections, an attempt was made to give a 3D understanding of flow around a simple series of T-shape groynes and to highlight its differences with the similar series of groynes with I-type head which is the typical form of groynes in practical designs. Finally, in this study an in-depth discussion about the physics of flow was done in order to compare the performance of a series of T-shape groynes with that of straight ones based on the primary objectives of the designs of the groynes.