In this work, the two-dimensional transient fluid flow across two circular cylinders arranged in tandem in the laminar regime is taken into account. The finite volume approach is the foundation of the simulation. A simple pressure–velocity coupling scheme is employed in this study. The numerical simulations used the variable Reynolds values and separations between the two cylinders. This study is solved using continuity and momentum equations are in Navier–Stokes equation. Several flow visualizations factors, such as pressure distributions, vortex shedding, and drag coefficients, were examined in this work. In order to show how the Reynolds number and gap spacing affect the flow behavior, these parameters are also compared for various scenarios. The drag coefficients of both cylinders in a tandem setup rapidly alter at a particular distance. However, at other distances, the drag coefficients do vary somewhat linearly with the increase in cylinder gap. Variation in L/D value has significantly shown the pressure zone changes. The relationship between the impact of flow behavior on pressure and drag coefficients were also discussed. The vortex shedding patterns from the upstream and downstream cylinder are identical at Re = 100 and L/D = 2.5 and 3. The results also revealed that velocity and pressure contours are somewhat lower when decreasing the gap between the cylinders.