Boundary Layer Theory is a comprehensive introduction to the physics of the boundary layer, and the latest numerical methods for describing it. The increases in computing power of recent decades have expanded our capability to investigate complex fluid phenomena such as boundary layer turbulence, and research in this field has lead to important advances for aerospace, chemical, thermal, and hydraulic engineering among other areas. With worked examples and problem exercises in every chapter, this book helps readers to understand the physics of the boundary layer before going through the related numerical solutions, and moving on to the latest numerical methods as they are used in research globally. Topical research areas such as non-Newtonian fluid-boundary layers, effects of magnetohydrodynamics on boundary layers, and three dimensional boundary layer effects are all addressed, making this the ideal starting point for any fluids engineer approaching a research topic in boundary layer.