RT Journal Article
T1 Unsteady aerodynamics of a general tandem of heaving and pitching foils from linear potential theory.
A1 Alaminos-Quesada, Javier
A1 Fernández-Feria, Ramón
K1 Aerodinámica
K1 Mecánica de fluidos
AB We derive general expressions for the aerodynamic force and moment on an arbitrary set of pitching and heaving foils from the vortical impulse theory in the limit of linearized potential, two-dimensional flow. Of special interest for studying the propulsion of some aquatic and aerial animals and small unmanned vehicles is the case of two oscillating foils in an aligned tandem configuration, for which analytical explicit expressions for the lift, thrust and moment are obtained. In the limit of large separation distance, we recover the expressions of a single oscillating foil for the forewing, but the hindwing is always affected by the unsteady wake of the forewing in the present inviscid model. Relatively simple expressions are obtained in the cases of two heaving foils and of two pitching foils, for which the optimal conditions generating a maximum thrust force and a maximum propulsion efficiency are mapped in terms of the non- dimensional separation distance, reduced frequency and phase shift, and discussed physically in relation to the optimal results for a single oscillating foil. The present theoretical results are compared with available experimental and numerical data, with good agreement for small amplitude of the oscillations and sufficiently high Reynolds numbers.
PB AIAA
YR 2020
FD 2020
LK https://hdl.handle.net/10630/39043
UL https://hdl.handle.net/10630/39043
LA eng
NO AIAA JOURNAL Vol. 58, No. 1, January 2020
NO https://openpolicyfinder.jisc.ac.uk/id/publication/9876
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026