Investigation of Heaving-pitching Airfoil in Ground Proximity using Large Eddy Simulations

This study examines the aerodynamics of a wing-in-ground (WIG) airfoil subjected to heaving (plunging) & pitching motion, specifically examining the distinctions in flow between transitional and turbulent states, which are essential for assessing its aerodynamic efficiency. The numerical investigation employs a validated Large Eddy Simulation (LES) model to evaluate WIG aerodynamics for a symmetrical airfoil. By analyzing variables such as pitching angle, phase shift angle, and pitching-to-heaving (PTH) ratios, the study explores their effects on thrust, lift, and drag. Findings indicate that adjusting critical heaving & pitching parameters significantly improves aerodynamic performance in turbulent flow, with thrust increasing ۴ to ۱۰-fold compared to transitional flow. Greater thrust and lift were observed in proximity to the ground. Modifying the phase-shift angle, pitching angle, and PTH led to thrust improvements of ۶۴.۹%, ۲.۹ times, and ۴ times, respectively. The enhanced aerodynamic properties near the ground are attributed to improved flow consistency and decreased separation during heaving & pitching in turbulent flow.

Keywords:

Ground effect , Large eddy simulation , Aerodynamics , Pitching airfoil , Vortex shedding , Computational fluid dynamics