Short-crested wave-current forces around a concentric multiple-cylinder structure

ABSTRACT

The potential flow theory is used to develop a new analytical method to solve the diffraction problem of short-crested incident waves with uniform current acting on a concentric multiple-cylinder system. The influence of uniform current on the hydrodynamic performance of the concentric structure is discussed. The incident angle and speed of the currents have a significant influence on the short-crested wave force and run-up on the concentric structure, i.e. the wave force and wave run-up increase significantly when wave and uniform current directions are the same, while decreasing when in the opposite direction of the wave and uniform current. Additionally, the effects of parameters such as the current incidence angle, current speed, porous-effect parameters, number of perforated walls, and short-crestedness of regular waves on the hydrodynamic performance of the concentric structures are valuated by numerical experiments. It is observed that as the number of permeable walls increases, wave load on the impermeable internal cylinder gradually decreases and the wave surface around is more even. This study is expected to provide theoretical guidance for the design of nearshore architecture.

KEYWORDS:

• Wave-structure interactions
• short-crested wave-current
• wave diffraction
• concentric multiple-cylinder structure

Acknowledgments

This work is supported by the Natural Science Foundation of China (42227901), Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (311020011), Key-Area Research and Development Program of Guangdong Province (2020B1111010004), the Special project for marine economy development of Guangdong Province (GDNRC [2022] 31) and (GDNRC [2021] 45).

Disclosure statement

No potential conflict of interest was reported by the authors.

Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.