Listar IMTF - Artículos por autor "Fernández-Feria, Ramón"
Mostrando ítems 1-12 de 12
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Analytical results for the propulsion performance of a flexible foil with prescribed pitching and heaving motions and passive small deflection
Fernández-Feria, Ramón; Alaminos-Quesada, Javier (Cambridge, 2021-01-28)The propulsive performance of a flexible foil with prescribed pitching and heaving motions about any pivot point location and passive chordwise flexural deflection is analysed within the framework of the linear potential ... -
Effects of inertia on the time-averaged propulsive performance of a pitching and heaving foil
Fernández-Feria, Ramón (Elsevier, 2023)The inertia may play an important role in the unsteady behavior of a flapping foil. Of particular relevance in forward flapping locomotion is how the foil inertia may affect its time-averaged propulsive performance. This ... -
Efficient self-propelled locomotion by an elastically supported rigid foil actuated by a torque
López-Tello, Pablo Esteban; Fernández-Feria, Ramón; Sanmiguel-Rojas, Enrique (Elsevier, 2022-11-19)A new theoretical model is presented for an aquatic vehicle self-propelled by a rigid foil undergoing pitching oscillations generated by a torque of small amplitude applied at an arbitrary pivot axis at which the foil is ... -
Flutter stability analysis of an elastically supported flexible foil. Application to the energy harvesting of a fully-passive flexible flapping-foil of small amplitude
Fernández-Feria, Ramón (Elsevier, 2022-02)The aerodynamic forces on an oscillating flexible foil are used to study the flutter instability when the flexible foil is elastically mounted to translational and torsional springs and dampers at an arbitrary pivot axis. ... -
Force and torque reactions on a pitching flexible aerofoil
Sanmiguel-Rojas, Enrique; Perona, J.L.; Fernández-Feria, Ramón (Cambridge, 2023)Experimental measurements in a wind tunnel of the unsteady force and moment that a fluid exerts on flexible flapping aerofoils are not trivial because the forces and moments caused by the aerofoil's inertia and others ... -
Numerical validation of simple non-stationary models for self-propelled pitching foils
Fernández-Feria, Ramón; Sanmiguel-Rojas, Enrique; Esteban López-Tello, Pablo (Elsevier, 2022-09-15)High-resolution numerical simulations of the self propelled locomotion of two-dimensional pitching foils are used to assess simplified models based on linear potential theory for the fluid-foil interaction. These models are ... -
On the feasibility of a flexible foil with passive heave to extract energy from low wind speeds
Fernández-Feria, Ramón; Sanmiguel-Rojas, Enrique (Elsevier, 2022-10)We explore numerically and theoretically the capability of flexible foils elastically mounted to translational springs and dampers at the leading edge to extract energy from low-speed winds through its passive heave ... -
Propulsion enhancement of flexible plunging foils: Comparing linear theory predictions with high-fidelity CFD results
Sanmiguel-Rojas, Enrique; Fernández-Feria, Ramón (ELSEVIER, 2021-09-01)The fluid–structure interaction of a flexible plunging hydrofoil immersed in a current is solved numerically to analyze its propulsion enhancement due to flexibility at Reynolds number 10 000. After validating with ... -
Simplified Model for Forward-Flight Transitions of a Bio-Inspired Unmanned Aerial Vehicle
Sánchez-Laulhe Cazorla, Ernesto; Fernández-Feria, Ramón; Ollero, Anibal (2022-10-18)A new forward-flight model for bird-like ornithopters is presented. The flight dynamics model uses results from potential, unsteady aerodynamics to characterize the forces generated by the flapping wings, including the ... -
Simplified Model for Forward-Flight Transitions of a Bio-Inspired Unmanned Aerial Vehicle
Sánchez-Laulhe Cazorla, Ernesto; Fernández-Feria, Ramón; Ollero, Anibal (IOAP-MPDI, 2022-10-18)A new forward-flight model for bird-like ornithopters is presented. The flight dynamics model uses results from potential, unsteady aerodynamics to characterize the forces generated by the flapping wings, including the ... -
Unsteady Propulsion of a Two-Dimensional Flapping Thin Airfoil in a Pulsating Stream.
Sánchez-Laulhe Cazorla, Ernesto; Fernández-Feria, Ramón; Ollero, Anibal (AIAA, 2023-06-26)The cruising velocity of animals, or robotic vehicles, that use flapping wings or fins to propel themselves is not constant but oscillates around a mean value with an amplitude usually much smaller than the mean, and a ...