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Title: A Comparative Study of Breaking Wave Loads on Cylindrical and Conical Substructures
Authors: Chatzimarkou, Eirinaios 
Michailides, Constantine 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Keywords: Breaking waves;k-ω SST turbulence model;Offshore wind turbine substructures
Issue Date: 1-Apr-2021
Source: Water, 2021, vol. 13, no. 7, articl. no. 924
Volume: 13
Issue: 7
Journal: Water 
Abstract: In the present paper, a comparative study of different cylindrical and conical substructures was performed under breaking wave loading with the open-source Computational Fluid Dynamics (CFD) package OpenFoam capable of the development of a numerical wave tank (NWT) with the use of Reynolds-Averaged Navier–Stokes (RANS) equations, the k-ω Shear Stress Transport (k-ω SST) turbulence model, and the volume of fluid (VOF) method. The validity of the NWT was verified with relevant experimental data. Then, through the application of the present numerical model, the distributions of dynamic pressure and velocity in the x-direction around the circumference of different cylindrical and conical substructures were examined. The results showed that the velocity and dynamic pressure distribution did not change significantly with the increase in the substructure’s diameter near the wave breaking height, although the incident wave conditions were similar. Another important aspect of the study was whether the hydrodynamic loading or the dynamic pressure distribution of a conical substructure would improve or deteriorate under the influence of breaking wave loading compared to a cylindrical one. It was concluded that the primary wave load in a conical substructure increased by 62.57% compared to the numerical results of a cylindrical substructure. In addition, the secondary load’s magnitude in the conical substructure was 3.39 times higher and the primary-to-secondary load ratio was double compared to a cylindrical substructure. These findings demonstrate that the conical substructure’s performance will deteriorate under breaking wave loading compared to a cylindrical one, and it is not recommended to use this type of substructure.
ISSN: 2073-4441
DOI: 10.3390/w13070924
Rights: © by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Cyprus University of Technology 
Appears in Collections:Άρθρα/Articles

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