연결체의 탄성을 고려한 SPAR기반 풍력발전단지의 파랑운동특성 수치해석

Abstract

In this paper, wave-induced motion characteristics of a few different offshore wind farms are numerically investigated. Hydrodynamic coefficients are carried out by High-Order Boundary Element Method. Wave diffaction effect by other floaters had been confirmed to be negligible as floaters are separated sufficiently. FEM is utilized to model elastic circular cylinders. Minimum energy principle is applied to formulate the connector motions and Lagrange multiplier method is adopted. Fairlead motion acts as a boundary condition. Taut mooring lines are installed to prevent the model drift-off. The entire system with different numerical schemes are integrated effectively with implicit iteration. Some offshore wind farms, which are different in the floaters number, arrangement, heading angle, sea state and number of mooring lines, are studied. Results are investigated in aspect of motions of each components and tensions of connector-ends.aters had been confirmed to be negligible as floaters are separated sufficiently. FEM is utilized to model elastic circular cylinders. Minimum energy principle is applied to formulate the connector motions and Lagrange multiplier method is adopted. Fairlead motion acts as a boundary condition. Taut mooring lines are installed to prevent the model drift-off. The entire system with different numerical schemes are integrated effectively with implicit iteration. Some offshore wind farms, which are different in the floaters number, arrangement, heading angle, sea state and number of mooring lines, are studied. Results are investigated in aspect of motions of each components and tensions of connector-ends.