The objective of this research is to study the fluid flow control allowing the reduction of aerodynamic drag around a square cylinder using two parallel partitions placed downstream of the cylinder using the lattice Boltzmann method with multiple relaxation times (MRT-LBM). In contrast to several existing investigations in the literature that study either the effect of position or the effect of length of a single horizontal or vertical plate, this work presents a numerical study on the effect of Reynolds number (Re), horizontal position (g), vertical position (a), and length (Lp) of the two control partitions. Therefore, this work will be considered as an assembly of several results presented in a single work. Indeed, the Reynolds numbers are selected from 20 to 300, the gap spacing (0 ≤ g ≤ 13), the vertical positions (0 ≤ a ≤ 0.8d), and the lengths of partitions (1d ≤ Lp ≤ 5d). To identify the different changes appearing in the flow and forces, we have conducted in this study a detailed analysis of velocity contours, lift and drag coefficients, and the root-mean-square value of the lift coefficient. The obtained results revealed three different flow regimes as the gap spacing was varied. Namely, the extended body regime for 0 ≤ g ≤ 3.9, the attachment flow regime for 4 ≤ g ≤ 5.5, and the completely developed flow regime for 6 ≤ g ≤ 13. A maximal percentage reduction in drag coefficient equal to 12.5%, is given at the critical gap spacing (g_{cr} = 3.9). Also, at the length of the critical partition (Lpcr = 3d), a Cd reduction percentage of 12.95% was found in comparison with the case without control. Moreover, the position of the optimal partition was found to be equal to 0.8d i.e. one is placed on the top edge of the square cylinder and the second one is placed on the bottom edge. The maximum value of the lift coefficient is reached for a plate length Lp = 2d when the plates are placed at a distance g = 4. On the other hand, this coefficient has almost the same mean value for all spacings between the two plates. Similarly, the root means the square value of the lift coefficient (Cl_{rms}) admits zero values for low Reynolds numbers and then increases slightly until it reaches its maximum for Re = 300.
Article Metrics:
Last update:
Influence of the slip boundary on square cylinders with lattice Boltzmann method
Kai Wang, Liuming Yang, Yang Yu, Guoxiang Hou. Physics of Fluids, 35 (12), 2023. doi: 10.1063/5.0180571Passive Control Modelization of a Fluid Flow Coupled with Convective Heat Transfer around a Heated Square Cylinder by using the LBM-MRT
Youssef Admi, Sara El Hassani, Jaouad Benhamou, Mohammed Amine Moussaoui, Ahmed Mezrhab. 2023 3rd International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET), 2023. doi: 10.1109/IRASET57153.2023.10152918Advanced Materials for Sustainable Energy and Engineering
Youssef Admi, Abdelilah Makaoui, Sara EL Hassani, Mohammed Amine Moussaoui, Ahmed Mezrhab. Springer Proceedings in Energy, 2024. doi: 10.1007/978-3-031-57022-3_11Heat transfer improvement and drag force reduction around three heated square cylinders controlled by partitions
Youssef Admi, El Bachir Lahmer, Jaouad Benhamou, Mohammed Amine Moussaoui, Ahmed Mezrhab. Physics of Fluids, 36 (4), 2024. doi: 10.1063/5.0191092Last update: 2024-09-15 01:54:13
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. Articles are freely available to both subscribers and the wider public with permitted reuse.
All articles published Open Access will be immediately and permanently free for everyone to read and download. We are continuously working with our author communities to select the best choice of license options: Creative Commons Attribution-ShareAlike (CC BY-SA). Authors and readers can copy and redistribute the material in any medium or format, as well as remix, transform, and build upon the material for any purpose, even commercially, but they must give appropriate credit (cite to the article or content), provide a link to the license, and indicate if changes were made. If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.