Author(s): Hiroyuki Ikari
Linked Author(s): Hiroyuki Ikari
Keywords: Particle method; 3-D numerical simulation; Stepped channel
Abstract: If a flooding due to a typhoon and a localized torrential rain flows into urban underground space, it goes through a staircase which is a entrance of urban underground space. On the other hand, stairs are course of people taking refuge from underground space. Hence, the flow over stepped channel must be analyzed for estimating the fluid force acting on human body going up against the flooding in urban underground space. All the previous studies on the flow over stepped channels have been done in the experimental approach. It is because that in the Eulerian method, which is popular as the method for analyzing the free surface flow, it is too difficult to treat violent fragmentation of water in this phenomenon. But, the particle method shows good performance to simulate the fragmentation and coalescence of liquid. The previous numerical simulations by particle method in hydraulic engineering were executed in 2-D field because we could not control the sufficient number of particles required to execute 3-D simulation, due to a limitation of computational memory. But, in these days, the hardware is rapidly developing and it is possible to track the sufficient number of particles to execute 3-D simulation under the rather small computational domain. In this study, 3-D simulation model of particle method is applied to the flow over stepped channels. Classification of the flow, which was shown by previous experiments, is reproduced well by the present model.
Year: 2005