The modelling of pile and bottom interaction under submerged wall jet effect

Nowadays, ships can berth and unberth under their own power with increasing ships maneuvering capability and high power engines. Because of this, propeller jet causes erosion at the navigation cahannels, seabed, the sloping banks of a harbour, quay walls and around the piers and this causes serious damages to harbour structures. For this reason, to obtain the jet velocity distribution besides the pile and quay walls when ships berthing and unberthing becomes very important problem for the designers. In this study, it is aimed to determine the submerged circular jet velocity distribution around a cylindirical pile experimentally and numerically. The problem was considered in four phases. These are; a) Submerged 3D circular free jet, b) Submerged 3D circular wall jet, c) Submerged 3D circular wall jet around a pile, d) Submerged 3D circular jet around a pile at the equilibrium scour hole with the movable bed . In the research, three different densimetric Froude Numbers, Frd=12.16, Frd=13.68 and Frd=15.21, were considered. In this study, the velocity distributions were determined by Acoustic Doppler Velocimeter (ADV) for different jet cases and it was found that there is a good agreement between the experimetal results and the literature. In the numerical solution, Realizable k ? ? turbulence model and turbulence intensity I=%10 showed closed agreement for the three cases and gived the best results for the fourth case. The numerical results were used to obtain the variation of bed-shear stress around the pile at the rigid bottom and the scour hole. Anahtar Kelimeler: Jet, local scour, ADV, turbulence modelling, k ? ? turbulence model, FLUENT