Free Surface Effects on the Hydrodynamic Characteristics of NACA0012

Free Surface Effects on the Hydrodynamic Characteristics of NACA0012

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When a transmedia vehicle moves across water and air media, the free surface has a great influence on its airfoil, which brings challenges to the overall design and navigation control.To investigate the hydrodynamic characteristics of an airfoil approaching the free surface from the far field in the air and water, numerical simulation models of this process were established for a NACA0012 based on a volume of fluid multiphase flow model using computational fluid dynamics.The feasibility of the models was verified, and the hydrodynamic characteristics of the airfoil working near the free surface were studied.

The argan oil pure purple results showed that the drag coefficient decreased gradually while the lift coefficient and lift-to-drag ratio increased as the airfoil approached the free surface from read more the far field in the air at a positive angle of attack.The lift coefficient and lift-to-drag ratio both decreased gradually when the airfoil approached the free surface from the underwater far field.When the distance was more than 10 times chord length, the drag coefficient increased gradually because of wave-induced action, and the drag coefficient decreased rapidly when the distance was less than 10 times chord length.

These results can provide reference for the overall design and navigation control of transmedia vehicles.