Many natural phenomena and engineering issues have nonlinear behavior. This behavior causes the study of fluid flow characteristics, as well as the process of heat transfer, to be complicated and difficult. In this book, several applied problems in the field of fluid mechanics and heat transfer have been investigated using analytical techniques. Nonlinear equations governing some of the mechanical engineering issues have been analysed in this book. By studying this book, the researcher will be able to analyse and solve nonlinear engineering issues.