Simulation of offshore floating hose oil transportation system based on AQWA and OrcaFlex

Abstract

Considering that the motion state and the stress of floating hose are complex under the combined action of winds, waves and currents, the dynamic simulation analysis of offshore floating hose oil transportation system was thereby carried out through the method of joint simulation based on AQWA and OrcaFlex.The numerical model was established to analyze the frequency domain of oil tanker by AQWA, and to perform the time domain analysis on the coupling motion between floating hose, oil tanker, buoy and mooring line by OrcaFlex.The results show that the influence of wind, waves and currents on the floating hose tension increases nonlinearly.The maximum tension points of the floating hose oil transportation system are at both ends of the hose.The tension acting on the hose can be obviously reduced and the drift distance can be shortened by setting securing anchors along the line.Through the analysis on the offshore floating hose oil transportation system with the transportation distance of 1 100 m, based on this method and model, it can be concluded that the optimal hose length is 1 300 m, the hose drift distance is about 300 m when no securing anchor is set along the line, and the safety requirements can be met under 4-level sea state.The research results can provide certain reference for the dynamic simulation analysis of such offshore floating hose oil transportation system.

Keywords

• floating hose
• sea state
• dynamic simulation
• frequency domain analysis
• time domain analysis