Numerical Study of Unsteady Wave-Generation for Flow Around NACA 0024 Airfoil

摘要

Using numerical method to study the unsteady free-surface, wave-induced flow for a surface-piercing NACA 0024 airfoil is presented here. The simulation conditions are: Froude numbers=0.19, 0.37, and 0.55 and Reynolds number=0.822, 1.52, and 2.26X106. The simulation includes mean far-field wave elevations for all three Fr, unsteady near-field wave elevations for medium and low Fr number, mean foil-surface pressures for all three Fr numbers, and unsteady foil-surface pressures for medium Fr number. The numerical method combined finite volume method with both VOF and reconstructing moving-interfaces of PLIC for the numerical calculation of free surface flow in the condition of Froude numbers=0.19, 0.37, and 0.55. For Fr=0:19, there is no separation and the expected Kelvin waves are present. The results of numerical simulation of free surface boundary-layer separation and wave-making of the airfoil have been analyzed and compared with the results with related data and figures which is provided by university IOWA U.S.A, the results of numerical simulation is in accord with that of experiment. It laid a good foundation for related research in the future.