The manuscript demonstrates a strong understanding of aeroelastic wind turbine simulations and clearly represents a substantial amount of work. At the same time, there are a number of methodological and presentation aspects that require improvement before the paper can be considered for publication. For this reason, I must recommend a major revision. Please find the attached pdf for detailed comments.

The authors present a two-way coupled LES–CSD framework for the IEA 15-MW wind turbine using an actuator-line model for blades and an immersed-boundary method for tower/nacelle. They compare two modal structural coupling variants (OV and T) against OpenFAST (ElastoDyn and BeamDyn) and report differences in loads, spectra, and wake dynamics, highlighting the importance of torsional coupling and the role of the tower.

The paper is well written and covers a very interesting topic. Anyhow, in my opinion, there are a number of aspects that require further refinement and/or additional analyses that will improve its scientific value.

Please make reference to the attached manuscript with notes where I listed all my comments.

In case any comment is not clear, please feel free to contact me.