Computational Fluid Dynamics (CFD) Applications in the Built Environment offers a clear, practice-oriented guide to using CFD for building and urban design. Written for non-specialist users, it bridges the gap between CFD theory and real-world application, guiding readers through the full modelling workflow from geometry and meshing to validation and interpretation. The book integrates academic benchmark studies with industry and research case examples drawn from decades of professional experience. Coverage includes ventilation, wind-driven rain, indoor air quality, thermal comfort, urban microclimate, vegetation effects, pollutant dispersion, fire safety, and hydrogen infrastructure. Aligned with performance-based design and green building certification, and supported by tutorial questions and working examples, this book is an essential reference for sustainable, high-performance built environments.