In-depth computational fluid dynamics (CFD) research on transient flow inside a thermal regenerator is the goal of this paper. The regenerator is heated to 100 °C at the beginning of the CFD simulation cycle. CATIA is used to create the computational/FEA model of the regenerator. The goal is to accurately simulate how gas flow will behave under various regenerator operation and design conditions. For CFD simulation, ANSYS Fluent software is employed.