Solar power, due to its widespread availability, occupies a crucial position within the renewable energy sector. Solar air heater (SAH) is one of the devices valued for their cost-effectiveness, simple design, and adaptability. However, optimizing the performance of a SAH poses many challenges due to the shape used to create turbulence inside it. Numerical simulation, employing computational fluid dynamics, is a key methodology for examining the impact of various shapes used for roughening the absorber plate. This study aims to overcome the associated challenges. The study explores the effectiveness of various geometric arrangements and coarseness patterns on the absorber plate to magnify heat pass on rates. Through comparing different geometries, the research aims to pinpoint the optimal design for improved thermal performance. Flow analysis employs the k-ω SST turbulence model, maintaining a consistent heat flux throughout the process. The investigation examines the impact of Reynolds numbers go from 2000 to 19,000 on various parameters. Following this, the findings are carefully analyzed and discussed to offer insights into the most effective strategies for increasing the potential of SAH.