Work

Performance prediction for interacting wing sails: A viscosity-corrected non-linear lifting line model compared to wind tunnel experiments at pre- and post-stall conditions

Year: 2025

Type: article

Abstract: As wind propulsion for ships emerges as a key measure to meet climate goals, there is an increasing need for effective performance prediction methods. This paper presents an efficient non-linear lifting line method (ISILL), enhanced with viscous corrections, specifically developed for interacting sails. The validation is conducted against wind tunnel experiments, covering a wide range of sheeting combinations, both pre- and post-stall conditions, at four different apparent wind angles. The results focus on predicting maximum driving force, corresponding sheeting angles, and yaw moment of the sail system. Up to and including the onset of stall, the overall agreement with wind tunnel experiments is satisfactory. The method remains computationally stable beyond the point of stall, although the accuracy decreases in the post-stall regime.

Source: Ocean Engineering

DOI: 10.1016/j.oceaneng.2025.123598

Authors: Karolina Malmek, Lars Larsson, Rickard E. Bensow, Christian Finnsgård

Institutions: RISE Research Institutes of Sweden, Chalmers University of Technology

Language: English

Topic: Ship Hydrodynamics and Maneuverability

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,150

Funders: Energimyndigheten, Trafikverket