3-D Numerical Simulation Of Hydrodynamic Loads On Rotating Sluices In Huangpu River

Huangpu River is a tideway crossing through Shanghai, therefore the flood prevention service constructing of Huangpu River is very important. For the sake of increasingly serious threat of storm surge, the feasible measure is to build a new-type floodgate. The rotating sluice is an appropriate type of the new-type floodgate.By utilizing the Reynolds Averaged NS equations and VOF method, numerical simulations for the new-type sluice to be built near Wusong station of Huangpu River are conducted using sliding mesh technique for conceptual design of the project.The hydrodynamic loads on sluices in the initial calculating flow field is validated, the flow field before the sluices rotating is also analyzed by using bend-flow theory. It is verified that the pre-computation is right for the sluices rotating calculation. The closing process of the sluice is classified into four working cases according to the rotate direction. The flow field and the hydrodynamic loads on sluices for these working cases are analyzed respectively. By comparison, it turns out that sluices rotate in opposite directions or in the opposite direction is a better choice.Computation of the pseudo-steady situation in fixed angle of the sluices is also carried out for comparing with the unsteady computation. It is found that the result of the pseudo-steady computation for the fixed angle deviate remarkably from that of the unsteady computation. On the other hand, by compared with the results of calculation in the boundary condition of fixed velocity speed, it is proved that the results are believable. The hydrodynamic loads on closed sluices are calculated in addition. And it is showed that the capability of sluices can't be brought into play completely, when the sluices are closed but not going down to the riverbed. The closed sluices should sink to riverbed as soon as possible.In this paper, the numerical model of hydrodynamic flow around a rotating sluice in tidal river is established based on FLUENT platform, the inconsistency of improving the computational precision and decreasing the computational time is balanced.