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This paper applies a Multiple-Grid technique -based Finite Element algorithm to predict the free-surface wave behavior in trapezoidal open-channel. This technique aims to limit the computational time consumed in the standard Finite Element procedure. The spatial integration of the flow model uses a Discontinuous Galerkin approach; while the time integration employs a Semi Implicit Euler method. The test case relates to the transient flow regime arising from the failure of a hydraulic power plant placed at the downstream extremity of an open-channel. Results show better performances of the Multiple-Grid technique compared to the conventional one in terms of consumed computational time criterion. Besides, the results obtained by the proposed algorithm illustrate close agreement with those obtained by the Finite Difference Method -based alternative algorithm.

Investigating the unidirectional flow behavior in trapezoidal open-channel