Author(s): Y. Kajikawa; M. Michiue; Y. Matsubara; O. Hinokidani
Linked Author(s):
Keywords: 3-Dimensional Numerical Simulation; Supercritical Flow; Sinuous Open Channel
Abstract: Recently, the flushing method using a bypass tunnel has received attention for dealing with problems due to sedimentation in reservoirs. However, in the bypass, since sediments are transported by a strong and high velocity flow, the problem of abrasion by friction between sediments and invert arises. In order to predict these abrasion points or the sediment transportation phenomenon, it is necessary to clarify in advance the 3-dimensional flow structures in the bypass. The purpose of this study is to reproduce the complex flow in the bypass tunnel using a 3-dimensional numerical simulation, and to carry out 3-dimensional numerical simulations of high velocity flow in a sinuous open channel under the supercritical flow condition field as a preceding stage. The FAVOR method which has the ability to impose boundary conditions smoothly at complicated boundaries is introduced into the governing equations in the numerical model. The MacCormack scheme that has been widely used in complex flow fields is applied to discretization of the governing equations. Additionally, non-static pressure is calculated. The calculated results considering non-static pressure are in good agreement with the experimental results, and indicates that a consideration of non-static pressure in 3-dimensional numerical simulations under the supercritical flow field is very important.
Year: 2003