NUMERICAL ANALYSIS OF THREE-DIMENSIONAL FLOW AND LOCAL SCOUR AROUND CYLINDER IN WAVE-CURRENT COEXISTENCE FIELD

Abstract

 The purpose of this study is to develop a three-dimensional numerical model that can accurately predict local scour phenomena around a cylinder under a wave-current coexistence field in order to contribute to scour countermeasures at the foundation of offshore wind power generation facilities. Verification of the wave-generation performance of the developed numerical model indicates that the model can reproduce water level variations well in wave alone and in wave-current coexistence conditions. In addition, the calculated results show that extremely complicated three-dimensional flow around a cylinder occurs in a wave-current coexistence field under the targeted experimental condition. Finally, a comparison of the scour phenomena shows that, except for the area directly behind the cylinder, the numerical model can qualitatively reproduce the local scour phenomena in a wave-current coexistence field.