Computational Methods for Wave Structure Interaction Modelling in Coastal Environments Under Consideration of Bathymetric Attributes

Abstract

In recent years, increasing ship-sizes and associated increasing wave loads have led to a demand for prediction tools quantifying the ship-induced loads on waterways. Depth-averaged numerical models, using a free surface pressure term, are a prominent method to obtain the relevant design parameters. These models incorporate the wave deformation processes due to attributes of complex bathymetries, while allowing for an efficient simulation of large computational domains. The non-hydrostatic shallow water equations model REEF3D::SFLOW uses a quadratic pressure approximation and high-order discretisation schemes. This paper presents the implementation of a pressure term to account for the displacement of the free surface by solid moving objects. Two test cases verifying the implementation are shown based upon the analytical 1-dimensional solution of the wave propagation due to surface pressure and the estimation of Havelock angles. These verification tests are the first step towards a holistic model, combining a large scale model with CFD simulations near waterway banks.

Hydrodynamic performance and wake study of an UUV sailing near the free surface

“…In deep, open waters, ships and undersea vehicles typically produce wakes that correspond to linear solutions (Pethiyagoda et al, 2014;Pethiyagoda et al, 2017), yet waves from close-to-shore or free-surface might behave nonlinearly. (Sadat-Hosseini et al, 2011;Caplier et al, 2016;Dempwolff et al, 2023;Song et al, 2023). Wake formation can be a consideration in ship and underwater vehicle layout is necessary since their wakes can endanger coastal infrastructure and ecosystems and act as a fuel drain for ships.…”