Author(s): Lim Jia Jun; Puay How Tion; Nor Azazi Zakaria

Linked Author(s): How Tion Puay, Nor Azazi Zakaria

Keywords: Abrupt expansion; Depth-averaged; Constrained Interpolation Profile (CIP)

Abstract: Abrupt expansion structure represents the lateral expansion in the geometry of the hydraulic structure. This kind of structure is often necessary for flow emerging at high velocity. This research aims to develop a numerical model to simulate supercritical flow at the abrupt expansion structure and reproduce the correct flow characteristics. A preliminary study on the flow structures (i.e. formation of the demarcation line, the zone of constant depth and shock waves) near the expansion and their relationships with the flow parameter is carried out in this study. A two-dimensional depth-averaged model incorporated with Constrained Interpolation Profile (CIP) scheme is developed to simulate the supercritical flow at the expansion structure numerically. This model utilized the time-splitting method to solve the depth-averaged by a two-step procedure: the advection part is solved first by employ CIP scheme followed by the non-advection part. Constrained Interpolation Profile (CIP) scheme are considered a robust and less diffusive solver. Results of the depth-averaged model are validated against analytical studies and experimental result from literature studies. Results showed that the numerical model performed satisfactorily in terms of the reproduction of the flow structure and flow characteristics near the abrupt expansion.

DOI:

Year: 2018