Redox flow battery (RFB) is considered as one of the most promising stationary energy storage technologies with the potential of commercialization, which might contribute to the deployment of intermittent renewable energies worldwide. To overcome critical technical challenges that still prevent the further market penetration of this technology, e.g., relatively low power and energy density and high pumping losses, many recent researches are concentrated on optimizations of the relevant components, in particular, the electrode and flow field. However, laboratory testing is often time- and material-intensive, and sometimes can be unavailable. Thus numerical simulations are increasingly expected to be an effective way to perform analysis and give in-depth insights on the physical phenomena.