Journal
JOURNAL OF SOUND AND VIBRATION
Volume 477, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2020.115338
Keywords
Computational wind engineering; Bridge aeroelasticity; Fluid-structure interaction; Optimal control; Large eddy simulation
Categories
Funding
- National Council for Scientific and Technological Development (CNPq, Brazil)
- Brazilian Federal Agency for Support and Evaluation of Graduate Education
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A fluid-structure interaction scheme for numerical simulation of actively controlled bridges subject to flutter instability is proposed in this work. In order to suppress or attenuate dynamic instabilities induced by the wind action on long-span bridges, control systems are proposed considering aerodynamic appendices and winglets attached to the deck structure, where control forces are continuously calculated using optimal control theory. The flow fundamental equations are solved here employing the explicit two-step Taylor-Galerkin method and the arbitrary Lagrangian-Eulerian (ALE) description. Eight-node hexahedral finite elements with one-point quadrature and hourglass stabilization are utilized for spatial discretization. Flow turbulence is modeled using Large Eddy Simulation (LES) and a partitioned coupling scheme is adopted for fluid-structure interactions. The structural system is analyzed considering the sectional model approach and a rigid-body formulation for large rotations. Different control techniques and winglet configurations are investigated using prismatic and bridge cross-sections, where control efficiency is evaluated in terms of displacement reduction and energy required by the control system. Preliminary results are obtained here employing approximate flowconditions to verify the control algorithm, where laminar flows and a two-dimensional LES-type approach are utilized. (C) 2020 Elsevier Ltd. All rights reserved.
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