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Wind and Structures
  Volume 15, Number 3, May 2012 , pages 189-208

Lock-in and drag amplification effects in slender line-like structures through CFD
Ali Vasallo Belver, Antolin Lorenzana Iban and Riccardo Rossi

    Lock-in and drag amplification phenomena are studied for a flexible cantilever using a simplified fluid-structure interaction approach. Instead of solving the 3D domain, a simplified setup is devised, in which 2D flow problems are solved on a number of planes parallel to the wind direction and transversal to the structure. On such planes, the incompressible Navier-Stokes equations are solved to estimate the fluid action at different positions of the line-like structure. The fluid flow on each plane is coupled with the structural deformation at the corresponding position, affecting the dynamic behaviour of the system. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to take in account the deformation of the domain, and a fractional-step scheme is used to solve the fluid field. The stabilization of incompressibility and convection is achieved through orthogonal quasi-static subscales, an approach that is believed to provide a first step towards turbulence modelling. In order to model the structural problem, a special one-dimensional element for thin walled cross-section beam is implemented. The standard secondorder Bossak method is used for the time integration of the structural problem.
Key Words
    fluid-structure interaction; vortex-induced vibrations; slender line-like structures; lock-in; drag coefficient amplification
Ali Vasallo Belver : CARTIF Centro Tecnologico, Parque Tecnologico de Boecillo, parcela 205, 47151 Boecillo (Valladolid), Spain
Antolin Lorenzana Iban : CARTIF Centro Tecnologico, Parque Tecnologico de Boecillo, parcela 205, 47151 Boecillo (Valladolid), Spain, ITAP. University of Valladolid, Paseo del Cauce 59, 47011 Valladolid, Spain
Riccardo Rossi: International Center for Numerical Methods in Engineering, Barcelona, 08034, Spain

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