With the increasing demand for energy conservation and emissions reduction in the shipping industry, suctionbased turbine sails have emerged as a novel wind energy utilization technology and have become a research hotspot. This study focuses on the aerodynamic performance of suction-based turbine sails with the aim of investigating the effects of suction intensity and suction port position on their aerodynamic characteristics. By employing Computational Fluid Dynamics (CFD) numerical simulations using the Re-Normalization Group (RNG) k–ε turbulence model and the SIMPLE algorithm, this study provides a detailed analysis of lift and drag coefficients, pressure distribution, and vorticity distribution under various combinations of suction intensity (γ) and suction port position (α). The results show that variations in suction intensity significantly affect the lift and drag characteristics of the turbine sail, while changes in the suction port position directly influence the attachment and separation behavior of airflow on the sail surface. Furthermore, a synergistic effect is observed between γ and α—their interaction not only alters the flow distribution but also plays a critical role in determining the overall performance of the turbine sail.By comprehensively considering the influence of these two factors, the study draws key conclusions for optimizing the design of suction-based turbine sail, providing valuable theoretical insights and technical guidance for their practical application in wind-assisted marine propulsion.

Abstract
1. Introduction
2. Principles and Methods
    2.1 Force Analysis of the Turbine Sail
    2.2 Governing Equations and Numerical Methods
3.Numerical Verification and SimulationConditions
    3.1 Computational Domain and Boundary Conditions
    3.2 Grid Division Measures
    3.3 Grid Convergence Verification
    3.5 Simulation Conditions
4. Results and Analysis
    4.1 Combined Effect of Suction Port Position and Suction Intensity on the Lift and Drag Coefficients of the Turbine Sail
    4.2 Effect of Suction Port Position on the Pressure Coefficient of the Turbine Sail
    4.3 Effect of Suction Port Position on the Flow Field Flow
    4.4 Effect of Suction Port Position on the Wake Vortex Structure in the Flow Field
5. Conclusion
References

• Deqi Jiang(School of Naval Architecture and Port Engineering, Shandong Jiaotong University, Weihai 264209, China)
• Haihua Lin(School of Naval Architecture and Port Engineering, Shandong Jiaotong University, Weihai 264209, China)
• Chengmeng Sun(School of Naval Architecture and Port Engineering, Shandong Jiaotong University, Weihai 264209, China) Corresponding author