Semi-Analytical Load Models Accounting for the Tilt and Motion of a Cylinder Impacted by a Plunging Breaking Wave

• Published in: Volume 2: Structures, Safety, and Reliability
• Main Authors: Renaud, Paul, Hulin, Florian, Batlle Martin, Marc, Scolan, Yves-Marie, Jacques, Nicolas, Harris, Jeffrey C., Filipot, Jean-François, Tassin, Alan
• Other Authors: France Energies Marines Brest, Institut de Recherche Dupuy de Lôme (IRDL), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire d'Hydraulique Saint-Venant / Saint-Venant laboratory for Hydraulics (LHSV), École des Ponts ParisTech (ENPC)-EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), Unité Recherches et Développements Technologiques (RDT)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2023
• Subjects: Analytical models; Offshore oil well production; Offshore wind turbines; Structural loads; Water waves; [SPI]Engineering Sciences [physics]; [SHS]Humanities and Social Sciences; Arctic
• Online Access: https://ensta-bretagne.hal.science/hal-04296316; https://doi.org/10.1115/OMAE2023-107740

International audience Abstract This work is part of the DIMPACT project that addresses breaking-wave-induced loads on floating wind turbines. In this context, the hydrodynamic impact of a strong plunging breaking wave on a cylinder is studied using semi-analytical models, with a focus on the loads sensitivity to the cylinder tilt and wave-cylinder relative motion. Two semi-analytical models are applied in a strip theory approach under the Froude-Krylov assumption. A numerical wave is generated using a Fully Nonlinear Potential Flow (FNPF) solver, whose free surface geometry and kinematics feed the semi-analytical models. Semi-analytical slamming loads are compared with force measurements collected in a wave flume for different pitch angles and surge speeds. The temporal variation of the force as well as the maximum force acting on the cylinder are well estimated by the semi-analytical models. A new engineering formula is finally developed, accounting for the inclination and surge motion of the cylinder. The impact loads computed with this formula also show good agreement with the experimental tests.