" Multi-Airfoil Design: Spectral Approach " tackles the challenge of accurately predicting airflow behavior around wings operating at low Reynolds numbers (Re). These regimes are crucial for understanding the performance of drones, micro air vehicles (MAVs), and wind turbine blades. This book delves into the Spectral Element Method (SEM), a powerful computational tool for simulating complex flow phenomena. By leveraging SEM's high accuracy and flexibility, the book explores the intricate flow patterns around low-Re wings, including boundary layer behavior, stall characteristics, and wake formation. This knowledge is critical for engineers designing efficient and stable Multi-Airfoil.