Hydrodynamics of a Partially Slipping Circular Cylinder in a Uniform Flow

This article explores numerical modeling of flow past a semi-coated hydrophobic cylinder, aiming for a deep understanding of hydrodynamic instability. Utilizing the finite volume method, the unsteady fluid dynamics and vortex creation are investigated. It evaluates the effectiveness of partial hydrophobic coating in stabilizing high-Reynolds number (Re) flows and delves into hydrodynamic features across various Reynolds numbers. Different coating angles θ are considered with a focus on their impact on lift and drag coefficients as well as the Strouhal number. Findings indicate that increasing θ leads to asymmetrical vortex shedding, causing noticeable drag variations. Lift coefficient fluctuations also show notable differences, especially peaking for θ < 90°. The fluctuation of drag coefficients rises until Re reaches 80, then decreases.