CFD Application to Evaluation of Wave and Current Loads on Fixed Cylindrical Substructure for Ocean Wind Turbine

doi:2011.25.2.7

J. Ocean Eng. Technol. > Volume 25(2); 2011 > Article

J. Ocean Eng. Technol. 2011;25(2):7-14.
DOI: https://doi.org/10.5574/KSOE.2011.25.2.007

Park Yeon-Seok,Chen Zheng-Shou,Kim Wu-Joan

Dept. of Ocean Engineering Mokpo National University,School of Naval Architecture and Civil Engineering Zhejiang Ocean University,Dept. of Ocean Engineering Mokpo National University

해상풍력발전용 고정식 원형 하부구조물에 작용하는 파랑 및 조류 하중 해석을 위한 CFD 기법의 적용

박연석,진정수,김우전

목포대학교 해양시스템공학과,중국절강해양대학교 선박해양공학과,목포대학교 해양시스템공학과

Keywords: Computational fluid dynamics, Morison's formula, High-order boundary element method, Numerical wave tank, Wave load, Current load, Circular cylinder

Abstract

Numerical simulations were performed for the evaluation of wave and current loads on a fixed cylindrical substructure model for an ocean wind turbine using the ANSYS-CFX package. The numerical wave tank was actualized by specifying the velocity at the inlet and applying momentum loss as a wave damper at the end of the wave tank. The Volume-Of-Fluid (VOF) scheme was adopted to capture the air-water interface. An accuracy validation of the numerical wave tank with a truncated vertical circular cylinder was accomplished by comparing the CFD results with Morison's formula, experimental results, and potential flow solutions using the higher-order boundary element method (HOBEM). A parametric study was carried out by alternately varying the length and amplitude of the wave. As a meaningful engineering application, in the present study, three kinds of conditions were considered, i.e., cases with current, waves, and a combination of current and progressive waves, passing through a cylindrical substructure model. It was found that the CFD results showed reasonable agreement with the results of the HOBEM and Morison's formula when only progressive waves were considered. However, when a current was included, CFD gave a smaller load than Morison's formula.