Handbook on Thermal Hydraulics in Water-Cooled Nuclear Reactors: Modelling is the Second Volume in a three-volume set edited by Professors Francesco D'Auria and Yassin Hassan. Based on the popular 2017 publication, Thermal-Hydraulics of Water-Cooled Nuclear Reactors, this second volume develops, updates and expands the existing chapters to reflect the latest research in the field, providing readers with an unrestricted analysis of the entire spectrum of the topic. This volume moves on from the fundamentals and principles to present and analyze various modelling techniques and code; knowledge which is solidified by the end-of-chapter questions and exercises which are solved in the appendix. Handbook on Thermal Hydraulics in Water-Cooled Nuclear Reactors: Modelling is a valuable reference for graduate and undergraduate students of nuclear or thermal engineering, as well as researchers in nuclear thermal-hydraulics and reactor technology, engineers working in simulation and modeling of nuclear reactors, and engineers and technicians' nuclear settings. Nuclear operators, code developers and safety engineers will also benefit from the practical guidance provided.