Fluid power scientists and engineers have produced a large amount of high quality books so far, which cover a vast amount of technologies involved in this field. Names like H. Merritt, D. Mc Cloy, H.R. Martin, W. Backe, J Watton, K. Edge, M. Ivantysynova, N.D. Manring among many others must be considered as the milestones in this field; their scientific publications and books have inspired generations of engineers. The first author of this book was lucky to be able to closely work for over 10 years with Professor John Watton, and in fact, most of the original research presented in this volume was undertaken at Cardiff University. The present book focuses on several components of fluid mechanics. The first three chapters are designed to give a proper background to the reader regarding the main fluid characteristics, chapter 1, the main fluid mechanics equations, chapter 2, and a strategic background of the Computer Fluid Dynamics (CFD) techniques, chapter 3. It must be kept in mind that nowadays, conventional mechanics, as well as fluid mechanics, are fully immersed in the CFD era; therefore the components design desperately needs the use of this relatively new tool.