Fortification of MMOC Models for Steep-Channel Flows

by Chintu Lai, (M.ASCE), Natl Taiwan Univ, Taipei, Taiwan,
Der-Liang Young, Natl Taiwan Univ, Taipei, Taiwan,
Jen-Ter Chang, Natl Taiwan Univ, Taipei, Taiwan,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The Multimode Method of Characteristics(MMOC), designed to solve unsteady flows, is a new comprehensive scheme formulated by merging several individual characteristic schemes of the specified-time-interval family. As such, it covers varied types and a wide range of flows, exceeding the combined capacity of the participating schemes. However, in applying an MMOC model to steep channel flows, the model does not perform as robustly as it should, due to its not-too-ideal mass-conserving ability. A series of investigations to improve this ability have been conducted. The new approach fortifies the MMOC with a finite element method (FEM) for additional integration of the continuity equation over the element. The resultant MMOC/FEM model has been applied to unsteady open-channel flows with fixed and movable beds. The computational results have shown an extraordinary improvement in mass conservation.

Subject Headings: Finite element method | Channel flow | Unsteady flow | Mathematical models | Numerical models | Differential equations | River and stream beds

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