A Non-hydrostatic Model for Simulating Dam-Break Flow Through Various Obstacles

Komang Dharmawan; Putu Veri Swastika; G K Gandhiadi; Sri Redjeki Pudjaprasetya

doi:10.13164/mendel.2024.1.033

Komang Dharmawan Udayana University https://orcid.org/0000-0002-7021-1386
Putu Veri Swastika Udayana University
G K Gandhiadi Udayana University https://orcid.org/0000-0002-6009-5721
Sri Redjeki Pudjaprasetya Institut Teknologi Bandung https://orcid.org/0000-0001-6346-0272

DOI: https://doi.org/10.13164/mendel.2024.1.033

Keywords: Modelling and Simulation, Saint Venant, Dam-break, Contraction, Non-hydrostatic

Abstract

In this paper, we develop a mathematical model for modelling and simulation of the dam-break flow through various obstacles. The model used here is an extension of one-layer non-hydrostatic (NH-1L) model by considering varying channel width (Saint Venant). The capability of our proposed scheme to simulate free surface wave generated by dam-break flow through various obstacles is demonstrated, by performing two types of simulation with various obstacles, such as; bottom obstacle and channel wall contraction. It is shown that our numerical scheme can produce the correct surface wave profile, comparable with existing experimental data. We found that our scheme demonstrates the evolution of a negative wave displacement followed by an oscillating dispersive wave train. These well-captured dispersive phenomena, indicated both the appropriate numerical treatment of the dispersive term in our model and the performance of our model.

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