A comparison of dynamic inflow models for the Blade Element Momentum method

Simone Mancini, Koen Boorsma, Gerard Schepers, and Feike Savenije

This paper compares four engineering dynamic inflow models for prescribed pitch motions of a modern wind turbine against a lifting line model.  Such a benchmark of existing dynamic inflow models applying to a commercial wind turbine model is necessary. It’s a well-written paper with a clear structure.

I have the following general comments:

1. A nomenclature is needed to understand all these terms, such as AM, AWSM, ECN, Oye,TUD-VR, etc.
2. The quantified load of AWSM simulations should be included in the analysis of section 3.3 and Appendix B.
3. Please better justify the necessity of exploring AWSM without the shed vorticity in sections 3.1.1 and 3.2.1, considering the following aspects:  A. As explained in the paper, the vorticity system is not conserved anymore just by disregarding the shed vorticity; B. The results are not consistent without shed vorticity in the step and sinusoidal pitch various by using the two dynamic stall models with and without effects from shed vorticity at the airfoil level;   C. What’s the “insight” into the physical effects brought by this investigation? If you want to keep this part, please state it in the conclusion explicitly.

Please find some specific comments in the attached pdf file.

Good luck with the revision!