Numerical Simulation of 3-D Flow Field in the Sand Funnel
The computation region of the sand funnel is treated by special means so that some reasonable boundary conditions can be adopted.Volume of Fluid(VOF) method is introduced to trace free-surface.The RNG model is used for turbulence modeling,all of which is combined.The 3-D water-air two-phase flow field in the sand funnel is simulated,and free-surface position,static pressure and velocity distribution are obtained.The comparison between velocity distribution and experimental results obtained from numerical calculation was conducted.The computed result has some instructive significance to study the characteristic of flow field in the sand funnel.
In this paper, the results of a series of elastoplastic large deflection analyses on a specific cylindrical shell part of the ship hull girders under inplane compression is reported. Nonlinear finite element method is applied in the calculations. It is revealed that the assumption of elastic-perfectly plastic behaviour for this part of the ship hulls is not realistic and may result in very optimistic predictions of the ship hull overall strength.