Detached Eddy Simulations of Air Flow Around NATO-Generic Destroyer

Sarı S., Doğrul A., Bayraktar S.

The 4th International Naval Architecture and Maritime Symposium (INT-NAM 2023) , İstanbul, Turkey, 11 - 13 October 2023, vol.1, no.1, pp.1-10

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1-10
  • Yıldız Technical University Affiliated: Yes


Ship aerodynamics is important for naval ships specifically equipped with a flight deck. However, the design requirements such as the sharp edges and plane surfaces of the superstructure and the existence of masts, weapons and electronic systems make the hull and superstructure of the warships unsuitable in terms of aerodynamics. Due to its importance, several experimental and numerical studies were carried out to investigate the basic flow fields around naval ships by employing generic ship geometries called simple frigate shape (SFS) and a modified version of SFS; simple frigate shape 2 (SFS2), in general. Although these generic geometries are simple and easy to investigate, they do not mimic the design of a modern warship. Hence, the North Atlantic Treaty Organization (NATO) Research Task Group proposed a new simplified geometry called NATO-GD (NATO generic destroyer) to represent a modern helicopter-carrying warship. Unlike SFS or SFS2, the NATO-GD geometry can be used for both hydrodynamics and aerodynamics studies. 

In the present paper, the effects of the atmospheric boundary layer (ABL) on the airflow around NATO-GD were numerically investigated. The highly complex, unsteady, and three-dimensional (3D) flow is solved by the Detached Eddy Simulation (DES) method since the DES is able to resolve the large-scale turbulence that can impact helicopter operations. Power spectral density (PSD) analyses were performed to obtain the dominant frequencies in the region over the helicopter deck for a vast range of wind-over-deck (WOD) angles.