ANALYSIS OF THE FLUID-STRUCTURE INTERACTION EFFECT ON THE FLUID DYNAMIC FORCES OF A WATER FLOW AROUND A NACA 0012 FLEXIBLE BLADE
Franciele Stail Bordin1; Adriane Prisco Petry1
1 Universidade Federal do Rio Grande do Sul
doi:10.20906/CPS/CILAMCE2015-0801
Resumo
Fluid dynamic forces are affected by any change in the shape of the structure. Often, its displacement and deformation are induced by the fluid dynamic forces themselves. Elements of flexible materials are employed in several engineering applications, for instance, in wind turbine blades. This paper presents the study of an external flow using fluid-structure interaction (FSI). The fluid dynamic forces cause the structure to deform, thereby disturbing the initial flow. Numerical simulations are performed in order to evaluate the effect that this deformation has on the fluid dynamic forces. The Ansys Workbench platform is used, combining the software Ansys CFX for the fluid analysis and Ansys Mechanical for the structural analysis. As a form of validation of this method, the laminar flow over an elastically mounted cylinder is studied and compared with literature data. The chosen case for this work is a turbulent water flow over a 3D blade element, fixed at one end and free at the other. The blade geometry is rectangular with the NACA 0012 profile and the turbulence model used is the k - ω SST. The results demonstrate the relevant influence that the deformation of the structure has on the fluid dynamic forces of lift and drag, leading to an agreement with the existing literature.
Palavras-chave: Fluid-structure interaction (FSI); Flexible blade ; Finite wing ; Fluid dynamic forces