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http://dx.doi.org/10.5574/KSOE.2011.25.2.007

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

Park, Yeon-Seok (Dept. of Ocean Engineering, Mokpo National University)
Chen, Zheng-Shou (School of Naval Architecture and Civil Engineering, Zhejiang Ocean University)
Kim, Wu-Joan (Dept. of Ocean Engineering, Mokpo National University)
Publication Information
Journal of Ocean Engineering and Technology / v.25, no.2, 2011 , pp. 7-14 More about this Journal
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.
Keywords
Computational fluid dynamics; Morison's formula; High-order boundary element method; Numerical wave tank; Wave load; Current load; Circular cylinder; Ocean wind turbine; Substructure;
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