Aeroelastic deformation of a perforated strip
Autor: | Mark Andrew Guttag, Hussain H. Karimi, Claudio Falcón, Pedro M. Reis |
---|---|
Rok vydání: | 2018 |
Předmět: |
Drag coefficient
animal structures Materials science Physics::Instrumentation and Detectors Flow (psychology) Computational Mechanics 02 engineering and technology STRIPS Deformation (meteorology) 01 natural sciences 010305 fluids & plasmas law.invention Physics::Fluid Dynamics law 0103 physical sciences Aerodynamic drag Composite material Porosity Fluid Flow and Transfer Processes technology industry and agriculture 021001 nanoscience & nanotechnology Aeroelasticity body regions Modeling and Simulation biological sciences Astrophysics::Earth and Planetary Astrophysics 0210 nano-technology Reduction (mathematics) human activities |
Zdroj: | Physical Review Fluids. 3 |
ISSN: | 2469-990X |
Popis: | We perform a combined experimental and numerical investigation into the static deformation of perforated elastic strips under uniform aerodynamic loading at high-Reynolds-number conditions. The static shape of the porous strips, clamped either horizontally or vertically, is quantified as they are deformed by wind loading, induced by a horizontal flow. The experimental profiles are compared to numerical simulations using a reduced model that takes into account the normal drag force on the deformed surface. For both configurations (vertical and horizontal clamping), we compute the drag coefficient of the strip, by fitting the experimental data to the model, and find that it decreases as a function of porosity. Surprisingly, we find that, for every value of porosity, the drag coefficients for the horizontal configuration are larger than those of the vertical configuration. For all data in both configurations, with the exception of the continuous strip clamped vertically, a linear relation is found between the porosity and drag. Making use of this linearity, we can rescale the drag coefficient in a way that it becomes constant as a function of the Cauchy number, which relates the force due to fluid loading on the elastic strip to its bending rigidity, independently of the material properties and porosity of the strip and the flow speed. Our findings on flexible strips are contrasted to previous work on rigid perforated plates. These results highlight some open questions regarding the usage of reduced models to describe the deformation of flexible structures subjected to aerodynamic loading. |
Databáze: | OpenAIRE |
Externí odkaz: |