Simulation and characterization of the laminar separation bubble over a NACA-0012 airfoil as a function of angle of attack

E Eljack, J Soria, Y Elawad, T Ohtake - Physical Review Fluids, 2021 - APS
This study examines the effects of angle of attack on the characteristics of the laminar
separation bubble (LSB), its associated low-frequency flow oscillation (LFO), and the flow …

Numerical simulation of flapping airfoil with alula

H Bao, W Yang, D Ma, W Song… - International Journal of …, 2020 - journals.sagepub.com
Bionic micro aerial vehicles have become popular because of their high thrust efficiency and
deceptive appearances. Leading edge or trailing edge devices (such as slots or flaps) are …

Investigation of the low-frequency oscillations in the flowfield about an airfoil

EM Eljack, J Soria - AIAA Journal, 2020 - arc.aiaa.org
The present investigation shows that a triad of three vortices is behind the quasi-periodic self-
sustained low-frequency flow oscillation phenomenon. Large-eddy simulations are carried …

Rudimentary emulation of covert feathers on low-AR wings for poststall lift enhancement

D Arivoli, I Singh, P Suriyanarayanan - AIAA Journal, 2020 - arc.aiaa.org
Covert feathers, a group of feathers on the upper surface of bird wings, are one of birds'
features that aid them in flight at high angles of attack, making them more maneuverable. In …

Low-order modeling and sensor-based prediction of stalled airfoils at moderate reynolds number

DW Carter, B Ganapathisubramani - AIAA Journal, 2023 - arc.aiaa.org
We present analysis from planar time-resolved particle image velocimetry fields in the
streamwise surface-normal plane of turbulent flow surrounding NACA 0012 and NACA 65 …

From low-frequency oscillations to Markovian bistable stall dynamics

I Kharsansky Atallah, L Pastur, R Monchaux… - Physical Review Fluids, 2024 - APS
We study the dynamics of a fixed wing at stall in a wind tunnel by measuring the
aerodynamic forces. We report experimental evidence of a critical Reynolds number from …

The structure and dynamics of the laminar separation bubble

EM Eljack - Journal of Fluid Mechanics, 2024 - cambridge.org
A novel selective mode decomposition, proper orthogonal decomposition and dynamic
mode decomposition methods are used to analyse large-eddy simulation data of the flow …

Transonic Buffet in Flow Past a Low-Reynolds-Number Airfoil

B Jia, W Li, HJ Bae - Journal of Aerospace Engineering, 2024 - ascelibrary.org
For propeller-driven Mars airplanes operating at low Reynolds numbers, the speed of the
rotor tips may reach transonic. To date, only a few studies have investigated the transonic …

Aerofoil Flow Sensing Using On-Board Optical Tracking of Flexible Pillar Sensors

O Selim, C Brücker - Fluids, 2023 - mdpi.com
A novel approach for sensing and characterising the flow over an aerofoil is introduced.
Arrays of flexible wind-hair-like sensors distributed over an aerofoil, which are tracked …

Large-Eddy Simulation of Low-Frequency Flow Oscillations for NACA0012 and Dynarig Sail at Large Attack Angles

Q Zeng, W Cai, J Xu - Journal of Marine Science and Engineering, 2024 - mdpi.com
Unmanned sailboats, harnessing wind for propulsion, offer great potential for extended
marine research due to their virtually unlimited endurance. The sails typically operate at high …