<p>Fluid flow through porous materials encompasses both laminar and turbulent flow. Triply periodic minimal surface (TPMS) structures, such as diamond and gyroid structures, exemplify porous materials with a high surface-to-volume ratio, intricate structure, and high permeability, suggesting potential applications in high-performance filters. This study investigates the influence of diamond and gyroid structure dimensions and thickness on the formation of laminar and turbulent flow patterns. A computational fluid dynamics (CFD) analysis was conducted on these structures, considering two design parameters: unit cell dimension and thickness. Flow visualization tools were employed to assess the impact of these parameters on laminar and turbulent flows. Additionally, a two-dimensional technique was developed to investigate the influence of the interior wall of these structures on flow formation. The simulation results demonstrate that adjusting the unit cell dimension and thickness can produce the desired laminar and turbulent flow characteristics.</p>