In this groundbreaking book, Advancements in Numerical Investigations and Applications of Nanofluids in Thermal Engineering, readers will delve into the forefront of scientific research, exploring advanced numerical techniques for modeling nanofluids in thermal engineering. Featuring cutting-edge computational simulations, this book offers invaluable insights into optimizing heat transfer processes using hybrid and ternary nanofluids. From thermophysical and rheological analyses to exploring the thermal performance of magnetic power-law hybrid nanofluids, the contents of this book provide a comprehensive overview of the latest developments in the field. The detailed contents span a wide range of topics, including advanced numerical modeling of hybrid and ternary nanofluids, the effects of internal heat generation and chemical reactions in porous media, and the magneto thermal aspects of ternary composite nanomaterials. With a focus on real-life applications, such as Darcy-Forchheimer flow with Marangoni convection and thermal control for Casson hybrid nanofluid flow, this book equips readers with the knowledge needed to navigate complex nanofluid models in thermal engineering systems effectively. For thermal engineers and nanofluids researchers seeking to enhance their understanding and practical applications, this book is a vital resource. By addressing daily challenges faced in research, such as selecting appropriate numerical methods and bridging the gap between mathematical models and real-world problems, this book serves as a guide for navigating complex nanofluid applications. With a focus on newly developed numerical methods, an outlook on nanofluid properties, and insights into thermal engineering applications, this book empowers researchers and engineers to optimize nanofluid formulations and leverage nanofluids in diverse thermal engineering contexts for enhanced heat transfer efficiency.