Akademik Veri Yönetim Sistemi
The 4th International Naval Architecture and Maritime Symposium (INT-NAM 2023) , İstanbul, Türkiye, 11 - 13 Ekim 2023, cilt.1, sa.1, ss.1-10
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.