Numerical study of longitudinal vein effects on the aerodynamic characteristics of a corrugated bio-airfoil

•Veins have notable effects on the aerodynamic performance of a bio-airfoil.•A Corrugated bio-airfoil is modelled with veins topologies inspired from nature.•Veins do not have significant effects on the lift of a pitching bio-airfoil.•At laminar flow regime, the drag of thick and veined bio-airfoils...

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Veröffentlicht in:Computers & fluids 2021-02, Vol.216, p.104821, Article 104821
Hauptverfasser: Vakilipour, Shidvash, Zarafshani, Hadi, Al-Zaili, Jafar
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Sprache:eng
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Zusammenfassung:•Veins have notable effects on the aerodynamic performance of a bio-airfoil.•A Corrugated bio-airfoil is modelled with veins topologies inspired from nature.•Veins do not have significant effects on the lift of a pitching bio-airfoil.•At laminar flow regime, the drag of thick and veined bio-airfoils is quite similar.•The highest drag is exerted on the veined bio-airfoil in a fully turbulent flow. The purpose of the present study is to investigate the influence of cross-sectional veins topology on the flow pattern and aerodynamic performance of a pitching corrugated bio-inspired airfoil. To demonstrate the vein effects, a cross-section of Ashena Cyanea wing is modelled with three configurations. The airflow passing bio-airfoil is subjected to three Reynolds numbers of 1000, 5000, and 14000 and selected reduced frequencies (k) and angular amplitude (A). The results show that as the Reynolds number increases, the effects of veins structure become more significant. The lift coefficients of the three modelled bio-airfoils are almost identical over the range of selected Reynolds number. At the Reynolds numbers of 1000 and 5000, the thin bio-airfoil has a minimum drag coefficient, and the drag coefficients of thick and veined bio-airfoils are quite similar. The veins in the bio-airfoils increase the drag coefficient significantly for the Reynolds numbers of 14000 compared to the Reynolds number of 5000. Finally, the numerical simulations provide hysteresis of lift and drag coefficients subjected to an increment for Reynolds number, reduced frequency, and angular amplitude.
ISSN:0045-7930
1879-0747
DOI:10.1016/j.compfluid.2020.104821