Experimental Investigation on the Characteristics of Pitch Motion for a Novel SPAR–type FOWT in Regular Waves

Abstract

Pitching mode is more crucial than heaving mode in assessing floating offshore wind turbine (FOWT) motion characteristics, especially the operation of the SPAR substructure. The aim of this paper is to develop an experimental method for improving the SPAR substructure to minimize unnecessary pitch motion. Toward this end, three vertical plate configurations based on the novel SPAR are being developed, known as the 3VP, 4VP, and 5VP models. In consideration of 0⁰, 30⁰, 60⁰, 90⁰-incidence, the pitch response characteristics of the proposed novel SPAR models are comprehensively evaluated in terms of submerged volume ratio, wave-induced motion, non-dimensional damping coefficient, and percentage of motion reduction. The model test results indicate that the 4VP model outperforms the other novel models with respect to dynamic response, particularly the incidence of 0⁰ and 90⁰. This study implies that the novel SPAR development is both feasible and effective in the modification of SPAR-type FOWT substructures.

Analisis Perubahan Karakteristik Aliran Fluida sekitar SPAR-3VP Terhadap Variasi Kecepatan Aliran di Kondisi Ekstrim

“…Karena itu, tidak ada jaminan bahwa akan ada solusi 'konvergen' pada kondisi mapan (steady state convergence) untuk suatu masalah. Masalah simulasi CFD pada umumnya bersifat non-linier dan teknik penyelesaiannya menggunakan proses secara iteratif untuk mendapatkan solusi hingga 'konvergensi' tercapai [3]. Untuk melakukan analisis pemodelan numerik aliran fluida di sekitar SPAR turbin angin lepas pantai berbasis CFD, digunakan software ANSYS Fluent.…”