Research

Airborne Wind Energy

A game changer in Wind Energy!

Our research in the field of Airborne Wind Energy (AWE) has particularly been focused on the aerodynamic modelling of crosswind kite power systems (CKPSs). Our analytical and computational research showed that contrary to what is widely perceived by researchers and designers, wind-kite and kite-kite aerodynamic interactions can be significant and thus should not be neglected. This finding has important implications for power output and cost of energy calculations for a single and a cluster of kite systems and thus for the prospect of the commercialization of CKPSs.

Iso-surface plot of vorticity showing the formation of the wake structure downstream of a large scale (~ 5MW) crosswind kite. The grey rectangular region in the figure represents the kite. Adapted from Kheiri, M., 2019. Airborne Wind Energy: A Game Changer in Wind Energy. Feature Article in the Canadian Society for Mechanical Engineering (CSME) Bulletin, Special Issue on Energy, Spring 2019. Link
Power coefficient contour plots (Akberali et al. 2021)

Fluid-Structure Interactions

From biomedical engineering to mining

Our contributions to the field of Fluid-Structure Interactions (FSI) concern mostly developing novel methods and improving the reliability of existing methods used for modelling and analysing flow-induced vibrations (FIV) of flexible slender bodies in contact with fluid flow, where the ultimate objective is to ensure the safety of engineering systems and thus to protect the public and safe guard the environment. Applications range from large-scale systems, such as intake risers used for pumping cold seawater from a depth of over 100 m to a floating unit to boost the natural gas liquefaction process efficiency, and brine strings used for solution mining as well as for storing CO2 and Hydrogen into salt caverns to small-scale systems, such as vibrations-based energy harvesters to power remote sensors, and ablation catheters used in minimally-invasive surgery to treat Atrial Fibrillation.

Nonlinear Aeroelasticity

Urban Air Mobility

Our contributions to the field of Aeroelasticity include the study of the linear/nonlinear aeroelastic behaviour of flexible wings/airfoils and the effects of wind gusts and developing control algorithms to actively suppress flutter and alleviate oscillations. Such studies are particularly important for applications, such as Urban Air Mobility where low-speed flying vehicles are subjected to highly turbulent gusty airflow that is typical of a built environment.

Open and closed-loop responses to a 1-cosine gust for an airfoil flying at the flutter speed (Zhang et al. 2021)
Bifurcation diagram for the flap degree-of-freedom for an airfoil with nonlinear stiffness (Zhang et al. 2021)