University of Tehran Press Iranian Journal of Biosystem Engineering 2008-4803 56 1 2025 04 21 Validation of Ansys Fluent and Rocky Software by Investigating the Effect of Rotating Cylindrical Sieve Performance Parameters on Rice Grain Cleanliness Validation of Ansys Fluent and Rocky Software by Investigating the Effect of Rotating Cylindrical Sieve Performance Parameters on Rice Grain Cleanliness 1 16 102370 10.22059/ijbse.2025.388956.665584 FA Kamran Safari Hosseinabadi Department of Biosystems Engineering, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran 0009-0007-7930-9623 Mehrnoosh Jafari Department of Biosystems Engineering, Faculty of Agriculture, Isfahan, Iran 0000-0002-0030-611X Mahdi Naderinezhad Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Razavi Khorasan, Iran 0000-0003-4200-343X Yasamin Tavakoli Department of Biosystems Engineering, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran 0009-0000-2177-015X Journal Article 2025 01 24 A cylindrical sieve, characterized by its simple structure, lightweight, negligible vibration, and lower energy consumption compared to other separation systems used in combines. This type of screen can serve as an alternative cleaning system for rice-threshed mixture when combined with air flow. This research employed computational fluid dynamics (CFD) and the discrete element method (DEM) to explore and enhance the understanding of the operational parameters influencing the performance of the cleaning sieve. The study examined the impact of air flow velocity and the rotational speed of the sieve on various separation indices, such as the cleanliness ratio, loss ratio, and efficiency. Findings indicated that air flow velocity significantly influences the average axial speed of the mixture components. The rotational speed of the sieve has a significant effect on both the loss ratio and the sieve's efficiency. In this study, Rocky DEM software was utilized as an alternative to EDEM for simulating the discrete flow of granular materials. The results of this study were validated through comparisons with earlier research that utilized EDEM software for simulations. Rocky DEM software developed by the provider of ANSYS Fluent, Rocky DEM enables the simulation of interactions between discrete particles and fluid flow using the coupled CFD-DEM method. Consequently, it serves as a viable replacement for EDEM, which has been extensively applied in agricultural research and engineering. A cylindrical sieve, characterized by its simple structure, lightweight, negligible vibration, and lower energy consumption compared to other separation systems used in combines. This type of screen can serve as an alternative cleaning system for rice-threshed mixture when combined with air flow. This research employed computational fluid dynamics (CFD) and the discrete element method (DEM) to explore and enhance the understanding of the operational parameters influencing the performance of the cleaning sieve. The study examined the impact of air flow velocity and the rotational speed of the sieve on various separation indices, such as the cleanliness ratio, loss ratio, and efficiency. Findings indicated that air flow velocity significantly influences the average axial speed of the mixture components. The rotational speed of the sieve has a significant effect on both the loss ratio and the sieve's efficiency. In this study, Rocky DEM software was utilized as an alternative to EDEM for simulating the discrete flow of granular materials. The results of this study were validated through comparisons with earlier research that utilized EDEM software for simulations. Rocky DEM software developed by the provider of ANSYS Fluent, Rocky DEM enables the simulation of interactions between discrete particles and fluid flow using the coupled CFD-DEM method. Consequently, it serves as a viable replacement for EDEM, which has been extensively applied in agricultural research and engineering. https://ijbse.ut.ac.ir/article_102370_467e8e0a3726b221e68e57c1b5cde1e4.pdf