Abstract
Focused wave is a practical laboratory method for reproducing extreme waves that cause catastrophic damage to marine and coastal structures. This paper presents a simple and efficient analytical method for predicting the hydrodynamic pressure and wave forces acting on a partially immersed box when subjected to a focused wave group attack. The boundary value issue of the physical problem is first investigated to derive an analytical formula based on potential flow theory and the matching eigenfunction method. Thereafter, the test data from a hydrodynamic experiment is used to verify the accuracy of the proposed analytical model. Using the validated analytical model, a parametric analysis is conducted to gain insight into the effects of the structural configuration and wave properties on the pressure and wave forces. It is observed that the hydrodynamic pressure on the offshore side plate, horizontal wave force, and moment are notably influenced by the structure breadth and draft. A focused wave with a lower peak frequency and higher focused amplitude is found to exert greater wave forces on the partially immersed box. The paper shows the value of linear wave theory for wave loads prediction even for focused waves although with some limitations.
Highlights
Extreme waves on offshore and coastal structures have been the subject for long time and their importance is increasing due to climate change, which leads to more severe storm and sea level rise
Aiming at convenience and efficiency, this paper presents an analytical solution for focused wave action on an immersed box by applying the potential flow method to investigate the velocity field of focused wave
Aiming at focused wave action, this paper presents an analytical method for analysing the hydrodynamic pressure and wave forces of a fixed submerged box, according to potential flow theory and the matching eigenfunction method
Summary
Extreme waves on offshore and coastal structures have been the subject for long time and their importance is increasing due to climate change, which leads to more severe storm and sea level rise. The action of the extreme waves on structures, such as wind turbine foundations, offshore platforms, floating vessels, and breakwaters, is an important aspect that should be considered in order to improve structure safety during service periods Both regular and irregular waves have been successfully generated in physical or numerical wave flumes or basins in different manners and have been used extensively by researchers to investigate wave actions on structures. As a simple means of gaining insight into the wavestructure interaction mechanism under a focused wave, it is possible to use the potential method for investigating wave action on this structure type. This issue has seldom been addressed by researchers.
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