This book addresses flow separationwithin the context of fluid-structure interaction phenomena.  Here, newfindings from two research communities focusing on fluids and structures arebrought together, emphasizing the importance of a unified multidisciplinaryapproach. The book covers the theory, experimental findings, numericalsimulations, and modeling in fluid dynamics and structural mechanics for bothincompressible and compressible separated unsteady flows. There is a focus onthe morphing of lifting structures in order to increase their aerodynamicand/or hydrodynamic performances, to control separation and to reducenoise, as well as to inspire the design of novel structures. The differentchapters are based on contributions presented at the ERCOFTAC Symposium onUnsteady Separation in Fluid-Structure Interaction held in Mykonos, Greece,17-21 June, 2013 and include extended discussions and new highlights. Thebook is intended for students, researchers and practitioners in the broad fieldof computational fluid dynamics and computational structural mechanics. It aimsat supporting them while dealing with practical issues, such as developingcontrol strategies for unsteady separation and applying smart materials andbiomimetic approaches for design and control.