Selected Papers from the 4th International Symposium on Thermal-Fluid Dynamics (ISTFD 2023)

The document is an editorial introducing selected papers from the 4th International Symposium on Thermal-Fluid Dynamics (ISTFD 2023). Thermal-fluid dynamics is a crucial field that impacts various subjects and technologies, including energy generation, aerospace, automotive engineering, and more. The ISTFD series was established in 2019 to promote research and progress in thermal-fluid dynamics. The 4th symposium was successfully held in Nanjing, China, in 2023, with over 200 participants from 15 countries. This special issue contains 15 peer-reviewed articles showcasing recent research progress in thermal-fluid dynamics and interdisciplinary research. [Extracted from the article]