Flow response to rapid morphing flap deflection

Abdessemed, Chawki; Yao, Yufeng; Bouferrouk, Abdessalem; Narayan, Pritesh

Abstract

Flow response to rapid morphing flap deflection is
investigated at a Reynolds number based on chord of
0.62×10^6 for a 2D NACA 0012 airfoil fitted with a
morphing Trailing-edge flap (TEF) at a range of angles
of attack and morphing frequencies. The study was
performed using a framework developed based on
combining an unsteady parametrization method and
dynamic mesh scheme integrated within the software
ANSYS Fluent. Turbulence closure was provided using
a hybrid RANS-LES turbulence model to capture smallscale
eddies for in-depth flow analysis. Time histories of
lift and drag coefficients were found to be proportional to
the morphing frequency. Contrary to the lift, the drag
experienced an overshoot in its instantaneous values
resulting in instantaneous efficiency loss before relaxing
to a steady state. Qualitative analysis showed that some
similarities exist between rapid morphing and ramp-type
pitching motion. Specifically, the morphing flap induces
upstream propagating turbulent structures, which
interacts with a laminar separation bubble near the
leading edge resulting in dynamic stall.

• Presentation Conference Type: Conference Paper (unpublished)
• Conference Name: 54th 3AF International Conference on Applied Aerodynamics
• Start Date: Mar 25, 2019
• End Date: Mar 27, 2019
• Acceptance Date: Mar 26, 2019
• Peer Reviewed: Not Peer Reviewed
• Keywords: moprhing, wing, airfoil, CFD, aerodynamics, active flow control, flap, RANS, LES, Hybrid, dynamic mesh, dynamic stall, off-design conditions
• Public URL: https://uwe-repository.worktribe.com/output/850073
• Additional Information: Title of Conference or Conference Proceedings : 54th 3AF International Conference on Applied Aerodynamics