Research Of The Resistance Coefficient Of Pile Groups In The Current Numerical Simulation

Pile jetty is one of the most normal structure of harbor engineering. Due to the peculiarity of the current flow in the district, there is lack of study in theory , physical model and numerical model are used to simulate the current condition on the front of jetty. For the domain in model experiment is very large, distort model is often used in physical model, while there is no proper numerical model in numerical simulation up to now, the pile jetty is usually simplified as erecting wall in these models to forecast the change of current due to construction by simulating. This simplified method could not reflect the influence of the piles on current and could not describe the real current condition on the front of jetty.Because the condition of current drag force of group piles is more complex than that of single pile, it is difficult to solve the problem in theory. In the paper, local physical model experiment is carried out as the research method and at last the calculation method is put up for considering the influence by group piles in numerical simulation for pile-foundation building and the drag force term in the numerical simulation controlling equation is also developed .On the base of current basic controlling equation, N-S equations are amended by introducing drag term . In determine the coefficient of drag, the group piles drag coefficient curves are obtained through channel experiment and the conclusion is put into numerical model for simulating several engineering condition . The result is shown that this method could reflect the real condition better and provide reference for later group piles numerical simulation.