Exploring Fluid Dynamics around Obstacles: Insights from Lattice Boltzmann Method and Immersed Boundary Technique

This study provides a detailed investigation into the complexities of fluid flow around circular obstacles, specifically scrutinizing the wake regime at varying Reynolds numbers. Given the increasing use of Computational Fluid Dynamics (CFD) and the inherent benefits of the Lattice Boltzmann Method (LBM), the research emphasizes the necessity to examine the impact of employing the Immersed Boundary (IB) technique. The study meticulously evaluates the accuracy and limitations of drag coefficient calculation methods within the framework of the LBM. Utilizing the LBM, the research systematically assesses the consequences of applying the Immersed Boundary IB technique. A meticulous comparative analysis is conducted between two prominent approaches, namely the Momentum Reduction Method (MRM) and the Momentum Exchange Method (MEM), to calculate the drag force acting upon obstacles at low Reynolds numbers (۱۰, ۲۵, and ۵۹). Irrespective of Reynolds number, the MRM consistently demonstrates a decrease in drag coefficient with increasing distance from the obstacle, underscoring the necessity for a specific cross-section for precise extraction. Generally, the study concludes by offering a comprehensive understanding of fluid dynamics around obstacles, providing valuable insights for engineering applications and contributing to advancements in the field.

کلیدواژه ها:

CFD ، LBM ، Immersed Boundary ، Drag Coefficient