Fluid-Structure Interaction Full field experimental measurement systems Fluid-Structure Interaction (FSI) is the study of fluid flow causing deformation of a surface or structure. Because of the interaction and the change of the surface profile, this results in a change in the fluid flow path: the behaviour of the fluid depends upon the surface shape, and the surface shape depends upon the fluid forces imparted on the surface. This interaction between fluid and structure may result in periodic or cycling instabilities which can establish Fluid Induced Vibrations (FIV). LaVision offer systems which can simultaneously measure and quantify the fluid and surface behaviour. 4 Particle Image Velocimetry (PIV) utilizes short pulses of laser light separated by known time intervals to illuminate a plane (or volume) of the seeded airflow. By imaging this it is possible to accurately ascertain a map of velocities Digital Image Correlation (DIC) images a surface and is able to track the shape and deformation of that surface By coupling our PIV and DIC technology we are able to measure the Fluid-Structure Interaction behaviour allowing users to validate and optimise their simulations. Fluid-Structure Interaction phenomena can be complex and non-linear, especially with today‘s novel materials and flexible lightweight components, and therefore experimental validation is increasingly important. Fluid-Structure Interaction effects are present in many different applications. 4 ships and yachts 4 heart valves and biomechanics 4 wave energy generation systems 4 flutter effects in aircraft 4 internal mechanics of pumps 4 wind turbines 4 car suspension systems 4 micro air vehicles 4 building design LaVision GmbH 2 Minton Place / Victoria Road Bicester, Oxon / OX26 6QB / United Kingdom E-Mail: [email protected] / www.lavisionuk.com Phone: +44-(0)-870-997-6532 / Fax: +44-(0)-870-762-6252 Anna-Vandenhoeck-Ring 19 D-37081 Göttingen / Germany E-Mail: [email protected] / www.lavision.com Tel. +49-(0)551-9004-0 / Fax +49-(0)551-9004-100 211 W. Michigan Ave. / Suite 100 Ypsilanti, MI 48197 / USA E-mail: [email protected] / www.lavisioninc.com Phone: (734) 485 - 0913 / Fax: (240) 465 - 4306

Courtesy of Charles E. Tinney (PIV data), and Dr Jayant Sirohi (DIC data), Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin central-plane map of velocity magnitude The example above shows the results of studies on a flexible rotor and illustrates the power of the two system types. DIC systems are able to accurately map the shape of the surface (and identify strain localization due to aerodynamic overloads - not shown), and PIV quantifies fluid dynamic features such as tip vortex shedding. Less obvious topics for Fluid Structure Interaction include biomechanical...