This book presents recent advancements in mechanics and energy, with a strong focus on solutions for analyzing and improving performance of renewable energy systems. Chapters cover advances in material science, computational modeling and simulation, fluid dynamics, and fluid-structure interaction. They also report on applications of machine learning in mechanics, research in additive manufacturing and application-oriented findings in thermal science and renewable energy . Gathering selected papers presented at the 9th International Conference on Mechanics and Energy (ICME2024), held on December 19-21, 2024, in Sousse, Tunisia, this book serves as a timely reference for academics and professionals across the broad spectrum of mechanics and energy disciplines.