This volume contains results gained from the EU-funded 4th Framework project, UNSI (Unsteady Viscous Flows in the Context of Fluid-Structure Interaction). Fifteen European organizations (industrial firms, research labs, and universities) have collaborated on the topic of non-linear, static and dynamic aeroelasticity applications with some special emphasis on the improvement of CFD methods applied to unsteady flow. Hence, the book is split into five main parts: project descriptions (with points of contact for the interested reader), summaries of work performed by each partner, summaries of work carried out in the work tasks, application-oriented syntheses, and, last but not least, conclusions and lessons learned.