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<p>This study evaluates the performance and structural response of modified two- and three-blade Savonius hydrokinetic turbines using an integrated experimental–CFD–FSI approach. Flume experiments validated transient ANSYS CFX simulations, and unsteady fluid loads were mapped to ANSYS Mechanical for one-way structural analysis across twelve candidate materials. Results show the three-blade design produces smoother flow fields, reduced stress concentration, and lower deformation than the two-blade turbine. High-stiffness materials such as aluminum, carbon fiber, and stainless steel demonstrate superior mechanical integrity, while polymers exhibit larger flexibility. Multi-criteria ranking using MOORA and TOPSIS identifies aluminum as the most suitable blade material. The findings highlight the structural and operational benefits of three-bladed Savonius configurations for small-scale hydropower.</p>

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Transient structural response of two- and three-bladed modified Savonius hydrokinetic turbines using fluid–structure interaction

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Pulijala Pawan Kumar,
  • Raj Kumar Singh

摘要

This study evaluates the performance and structural response of modified two- and three-blade Savonius hydrokinetic turbines using an integrated experimental–CFD–FSI approach. Flume experiments validated transient ANSYS CFX simulations, and unsteady fluid loads were mapped to ANSYS Mechanical for one-way structural analysis across twelve candidate materials. Results show the three-blade design produces smoother flow fields, reduced stress concentration, and lower deformation than the two-blade turbine. High-stiffness materials such as aluminum, carbon fiber, and stainless steel demonstrate superior mechanical integrity, while polymers exhibit larger flexibility. Multi-criteria ranking using MOORA and TOPSIS identifies aluminum as the most suitable blade material. The findings highlight the structural and operational benefits of three-bladed Savonius configurations for small-scale hydropower.