The 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS’21) aims to become the leading virtual conference in fields related to fluid flow and heat transfer. The goal of ICFFTS'21 is to provide an online space for scholars from all over the world to present advances in the relevant fields and to foster a virtual environment conducive to exchanging ideas and information. ICFFTS'21 is an acronym for International Conference on Fluid Flow and Thermal and Science.