Simulation on tsunami-like solitary wave run-up around a conical island using a modified mass source method. Issue 1 (1st January 2019)

• Record Type: Journal Article
• Authors: Ma, Zhe; Zhou, Ting; Sun, Jiawen; Zhai, Gangjun
• Is Part Of: Engineering applications of computational fluid mechanics. Volume 13:Issue 1(2018)
• Page Start: 849
• Page End: 859
• Publication Date: 2019-01-01
• Subjects: Mass source wave generation -- solitary wave -- highly nonlinear -- wave run-up -- DUT-FOAM; Computational fluid dynamics -- Periodicals; 620.10640285
• DOI: 10.1080/19942060.2019.1642960
• Languages: English
• ISSNs: 1994-2060

Abstract

Abstract: Predicting the maximum run-up height and inundated area caused by tsunami events has been a hotly debated topic recently. Nevertheless, the wave height-to-depth ratios (nonlinearity) adapted previously tended to be conservative, considering the fact that a tsunami wave is an extreme wave condition with large wave height. In the present study, a mass source wave-generating approach for highly nonlinear waves is presented using our in-house solver, DUT-FOAM, which is a hydrodynamic solver developed using the open source code library OpenFOAM. By fully considering the mass output from the source region, a more reasonable mass source function has been obtained to compensate for the inadequacy of original method in simulating highly nonlinear waves. A newly designed numerical wave tank is performed for different nonlinearities. Numerical simulations of tsunami wave propagating to a conical island are carried. Fairly good agreements are obtained from the qualitative and quantitative comparisons between numerical results (Liu, Cho, Briggs, Kanoglu, & Synolakis, 1995) and laboratory data (Briggs, Synolakis, Harkins, & Green, 1995) regarding run-up maps around the island. The comparison reveals that present model offers a fast and accurate way to simulate highly nonlinear waves and is potentially useful and efficient for forecasting the run-up heights.