Computational Modelling of Control of Laminar Separation Bubble over an Airfoil Using an Integrated Tubercle and Vortex Generator

This paper examines a model that combines vortex generators and leading-edge tubercles for controlling the laminar separation bubble (LSB) over an airfoil at low Reynolds numbers (Re). This new concept of passive flow control technique utilizing a tubercle and vortex generator (VG) close to the leading edge was analyzed numerically for a NACA0015 airfoil. In this study, the Shear Stress Transport (SST) turbulence model was employed in the numerical modelling. Numerical modelling was completed using the ANSYS-Fluent 18.2 solver. Analyses were conducted to investigate the flow pattern and understand the underlying LSB control phenomena that enabled the new passive flow control method to provide this significant performance benefit. The findings indicated that the new concept of passive flow control technique suppressed the formation of an LSB at the suction surface of the NACA0015 airfoil, resulting in a higher lift coefficient and improved aerodynamic performance. Improvements in LSB dynamics and aerodynamic performance through the passive flow control method lead to increased energy output and enhanced stability.