Design, operation and analysis of wind-assisted cargo ships. (1st September 2020)

• Record Type: Journal Article
• Authors: Tillig, Fabian; Ringsberg, Jonas W.
• Is Part Of: Ocean engineering. Volume 211(2020)
• Publication Date: 2020-09-01
• Subjects: Energy systems model -- Flettner rotor -- Performance prediction -- Ship design -- Wind-assisted propulsion; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2020.107603
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This study presents a novel approach to analytically capture aero- and hydrodynamic interaction effects on wind-assisted ships. Low aspect ratio wing theory is applied and modified to be used for the prediction of lift and drag forces of hulls sailing at drift angles. Aerodynamic interaction effects are captured by analytically solving the Navier-Stokes equation for incompressible, potential flow. The developed methods are implemented to a 4 degrees-of-freedom performance prediction model called "ShipCLEAN", including a newly developed method for rpm control of Flettner rotors on a ship to maximize fuel savings. The accuracy of the model is proven by model- and full-scale verification. To present the variability of the model, two case study ships, a tanker and a RoRo, are equipped with a total of 11 different arrangements of Flettner rotors. The fuel savings and payback times are assessed using realistic weather from ships traveling on a Pacific Ocean route (tanker) and Baltic Sea route (RoRo). The results verify the importance of using a 4 degrees-of-freedom ship performance model, aero- and hydrodynamic interaction and the importance of controlling the rpm of each rotor individually. Fuel savings of 30% are achieved for the tanker, and 14% are achieved for the RoRo. Highlights: Aero- and hydrodynamic interaction effects of Flettner Rotors on a ship. Analytical solutions of the incompressible Navier Stokes (Euler) equation for the aerodynamic interactions. 4DOF simulation of the static equilibrium. Low aspect ratio wing theory is applied on ship hulls sailing at a drift angle. Fuel savings of up to 30% are achieved for a Tanker with 6 Flettner rotors on a Pacific ocean route.