Preprints
https://doi.org/10.5194/wes-2025-105
https://doi.org/10.5194/wes-2025-105
01 Sep 2025
 | 01 Sep 2025
Status: this preprint is currently under review for the journal WES.

Comment on "Glauert's optimum rotor disk revisited – a calculus of variations solution and exact integrals for thrust and bending moment coefficients" by Tyagi and Schmitz (2025)

J. Gordon Leishman
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J. Gordon Leishman

Status: open (until 29 Sep 2025)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2025-105', Anonymous Referee #1, 05 Sep 2025 reply
    • AC1: 'Reply on RC1', J. Gordon Leishman, 10 Sep 2025 reply
      • CEC1: 'Reply on AC1', Carlo L. Bottasso, 11 Sep 2025 reply
        • AC4: 'Reply on CEC1', J. Gordon Leishman, 11 Sep 2025 reply
  • RC2: 'Comment on wes-2025-105', Anonymous Referee #2, 09 Sep 2025 reply
    • AC2: 'Reply on RC2', J. Gordon Leishman, 10 Sep 2025 reply
      • CEC2: 'Reply on AC2', Carlo L. Bottasso, 11 Sep 2025 reply
        • AC5: 'Reply on CEC2', J. Gordon Leishman, 11 Sep 2025 reply
  • RC3: 'Comments by reviewer wes-2025-105', Anonymous Referee #3, 11 Sep 2025 reply
    • AC3: 'Reply on RC3', J. Gordon Leishman, 11 Sep 2025 reply
J. Gordon Leishman
J. Gordon Leishman

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Short summary
This paper revisits the momentum theory problem for a windmill (i.e., a wind turbine) with apparent mathematical rigor and pedagogical eloquence. Still, it ultimately offers nothing of substance to the wind energy field. Recasting Glauert's optimum rotor formulation using the calculus of variations and L'Hôpital's rule may suggest an air of analytical sophistication, yet it is little more than formalist repackaging that obscures rather than clarifies the underlying physical principles.
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