Small scale experimental validation of a numerical model of the HarshLab2.0 floating platform coupled with a non-linear lumped mass catenary mooring system

• Published in: Ocean engineering Vol. 200; p. 107036
• Main Authors: Touzon, Imanol, Nava, Vincenzo, Gao, Zhen, Mendikoa, Iñigo, Petuya, Victor
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.03.2020
• Subjects: Catenary mooring system; Lagrange multipliers; Linear hydrodynamics; Lumped mass; Offshore renewable energy; Catenary mooring system; Linear hydrodynamics; Lumped mass; Lagrange multipliers; Offshore renewable energy
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2020.107036

When focusing on mooring system numerical modelling, the efforts are focused on validating models that increase the accuracy and maintain the computation time under reasonable limits. In this paper an approach for modelling the interaction among supporting structure and mooring system is introduced through kinematic relations. The proposed approach has been validated with the experimental wave tank 1:13.6 scaled data of the HarshLab 2.0 platform, a CALM type buoy moored with a three-line catenary system and used as a floating laboratory for materials and corrosion testing, to be installed at BiMEP. The drag forces of the buoy as well as the Morison coefficients of the heave-pitch coupling, induced by the attached structure for ships boat landing, have been identified. Results of the mooring line tensions are validated with imposed displacements of the structure and, subsequently, with coupled simulations of the moored buoy in a set of realistic sea states. Sources of differences on the estimation of line tensions are found to be mainly due to uncertainties of seabed friction forces, a high sensitivity of line tensions to small swaying and a poor pitching performance of the numerical model, very likely due to a very non-linear pitching of the physical model. •A fully coupled numerical model of a floating structure with a lumped mass mooring system.•A 1:13.6 scaled model of a moored CALM buoy, with a bow landing structure attached, physical testing.•Numerical model validation, with viscous drag force and heave-pitch cross coupled Morison force in a set of 12 sea states.