This paper applies the SPH method to the oil-water separation via membranes, and investigates the effects of membrane shape and thickness, pore and oil droplet sizes, oil viscosity and driving force on the separation performance. The study, though brief, is interesting and comprehensive, with a promising numerical approach being adopted and valuable results being obtained. However, major revisions are required before the paper will be considered for publication. 1. Apart from the already-mentioned applications on lines 57-58, the Lagrangian and particle-based features make the SPH particularly suitable for modeling wave-structure interaction, to cite just a few: [1] He, M., Khayyer, A., Gao, X., Xu, W., Liu, B., 2021. Theoretical method for generating solitary waves using plunger-type wavemakers and its Smoothed Particle Hydrodynamics validation. Appl. Ocean Res. 106, 102414. https://doi.org/10.1016/j.apor.2020.102414. [2] Crespo, A.J.C., Altomare, C., Domínguez, J.M., González-Cao, J., Gómez-Gesteira, M., 2017. Towards simulating floating offshore oscillating water column converters with Smoothed Particle Hydrodynamics. Coast. Eng. 126, 11-26. https://doi.org/10.1016/j.coastaleng.2017.05.001. [3] Chen, Y, Meringolo, D.D., Liu, Y., 2022. SPH study of wave force on simplified superstructure of open-type sea access road. Ocean Eng. 249, 110869. https://doi.org/10.1016/j.oceaneng.2022.110869. 2. Since the membrane is composed of solid wall particles, the solid boundary condition (including density, pressure and velocity) adopted in this work must be introduced. 3. A quantitative validation of the SPH model is necessary, rather than the qualitative validation given in section 3.1. 4. A convergence check is also necessary, which helps to confirm whether the same phenomena will occur with finer and coarser particle resolutions. 5. Could you explain why oil particle has larger volumes than water particles? For example, in Fig. 2b, a red particle occupies more space than a blue particle.

The authors have addressed all my comments. I would recommend its publication.