Analysis of One-Dimensional Unsteady Open Channel Flow Applying Space-Time Conservation Method

概要

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From among the methods of computing one-dimensional unsteady open channel flow, space-time conservation method is picked out, which has flux limiter functions to prevent numerical oscillations and whose settings of various boundary conditions are easy to handle, that are decided by water control structures, discharge, water depth, etc. Then calculation methods in boundary sections which use the same algorithms as interior points are presented. As a consequence of improvement of algorithms in boundary sections at abrupt bed slope changing, the scheme becomes possible to compute equations without a numerical oscillation even in transition part from subcritical to supercritical flow or hydraulic jump. It is showed that the scheme that we propose is effective as a result of comparing numerical solution with theoretical solution for the analysis of reflection of bore and comparing numerical solution with steady water surface obtained by calculation of water surface profile for the analysis of flow in channel that has bed slope changing.
公益社団法人農業農村工学会の論文