Flow noise : theory This book highlights the importance of sound produced by fluid flow or flow induced noise. Noise created by unsteady flow creates high levels of environmental noise pollution a known public health problem and can compromise the acoustic qualities of marine vessels. There is a seemingly ever growing list of modern technology that created flow induced noise which includes aircraft wind turbines submarines drones high speed rail and cooling fans. More scientists and engineers are required to incorporate the effects of flow induced noise in their work. This book also provides a comprehensive introduction to the theory underpinning the understanding of flow induced noise.