The bipolar plates (BPs) are a crucial component in proton exchange membrane water electrolysis (PEMWE) and proton exchange membrane fuel cells (PEMFC). They provide mechanical support and electrical conduction, and most importantly, they create a flow field that distributes reactant gases uniformly across the porous electrodes and removes product gases. The design of BPs significantly influences the heat and mass transfer properties of PEMWE, impacting overall performance and efficiency. Therefore, this paper aims to enhance these properties by focusing on BP design. To achieve this goal, we investigate a typical round BP with concentric circle flow channels through 3D computational fluid dynamics (CFD) simulations using COMSOL Multiphysics 6.2. The simulations incorporate the coupling of heat, mass, and momentum transfer. The process begins with three concentric flow channels with different width arrangements. Based on the initial results analysis, further optimization was conducted based on equal channels and ribs configuration to increase the uniformity of the fluid flow. Furthermore, improve the gas removal ability. The results of these configurations are compared and analyzed, providing a theoretical basis for designing and applying such BPs in both PEMWE and PEMFC.