A σ-coordinate three-dimensional numerical model for surface wave propagation

Pengzhi Lin, Chi Wai Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

175 Citations (Scopus)

Abstract

A three-dimensional numerical model based on the full Navier-Stokes equations (NSE) in σ-coordinate is developed in this study. The σ-coordinate transformation is first introduced to map the irregular physical domain with the wavy free surface and uneven bottom to the regular computational domain with the shape of a rectangular prism. Using the chain rule of partial differentiation, a new set of governing equations is derived in the σ-coordinate from the original NSE defined in the Cartesian coordinate. The operator splitting method (Li and Yu, Int. J. Num. Meth. Fluids 1996; 23:485-501), which splits the solution procedure into the advection, diffusion, and propagation steps, is used to solve the modified NSE. The model is first tested for mass and energy conservation as well as mesh convergence by using an example of water sloshing in a confined tank. Excellent agreements between numerical results and analytical solutions are obtained. The model is then used to simulate two- and three-dimensional solitary waves propagating in constant depth. Very good agreements between numerical results and analytical solutions are obtained for both free surface displacements and velocities. Finally, a more realistic case of periodic wave train passing through a submerged breakwater is simulated. Comparisons between numerical results and experimental data are promising. The model is proven to be an accurate tool for consequent studies of wave-structure interaction.
Original languageEnglish
Pages (from-to)1045-1068
Number of pages24
JournalInternational Journal for Numerical Methods in Fluids
Volume38
Issue number11
DOIs
Publication statusPublished - 20 Apr 2002

Keywords

  • σ-coordinate transformation
  • Surface wave
  • Three-dimensional model

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

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