PASSIVE CONTROL OF THE FLOW AROUND A CYLINDER BY USING GEOMETRIC MODIFICATIONS

The present study is aimed at reducing the drag loads on cylinders by using a passive control technique which consists in shape modification for streamlined and bluff bodies, particularly those used in aeronautics. Various shapes of elliptic and ovate-elliptic cross sections were tested with studying the effect of geometric parameters, namely, the radius ratio and axial ratio. The flow around the proposed geometries was studied numerically using k–ε, k–ω, and Spalart–Allmaras turbulence models at the Reynolds numbers from 10⁴ to 2.4 ⋅ 10⁴ . The results obtained were compared with those for a circular cylinder of constant radius, showing a significant weakening of aerodynamic forces acting on the cylinder with modified shapes, especially at high Reynolds numbers, for both elliptic and ovate-elliptic geometries with a better performance for the latter
The present study is aimed at reducing the drag loads on cylinders by using a passive control technique which consists in shape modification for streamlined and bluff bodies, particularly those used in aeronautics. Various shapes of elliptic and ovate-elliptic cross sections were tested with studying the effect of geometric parameters, namely, the radius ratio and axial ratio. The flow around the proposed geometries was studied numerically using k–ε, k–ω, and Spalart–Allmaras turbulence models at the Reynolds numbers from 10⁴ to 2.4 ⋅ 10⁴ . The results obtained were compared with those for a circular cylinder of constant radius, showing a significant weakening of aerodynamic forces acting on the cylinder with modified shapes, especially at high Reynolds numbers, for both elliptic and ovate-elliptic geometries with a better performance for the latter Автор:  F. Djemil, O. Ladjedel, F. Zemani, M. Belharizi, T. Yahiaoui L.Adjlout
Ключевые слова:  flow control, cylinder shape modification, pressure coefficient, drag coefficient
Стр:  1329-1339