  Noise generation attributed to the flow around a cylinder and its control is
of paramount importance in a multitude of engineering applications. In this
study, we employ computational fluid dynamics (CFD) coupled with acoustic
analogy, complemented by an analysis grounded in vortex dynamics theory, to
explore the potential of wavy cylinder shapes in improving aerodynamic
performance and mitigating aerodynamic noise. The series cylinder simplified
from the aircraft landing gear and elliptical cylinder noise suppression
mechanism is analyzed.Our research outcomes clearly indicate that elliptical
ylinder designs have a notable impact on aerodynamic performance and noise
reduction. Specifically, these designs effectively lower the average drag
coefficient and efficiently suppress lift coefficient fluctuations, resulting
in an overall reduction in noise production by the elliptical cylinder. To
delve into the underlying mechanisms of noise suppression, our study
meticulously examines the process of vorticity generation around the elliptical
cylinder's surface. This examination yields profound improvements in the
distribution of vorticity on the cylinder's surface, along with a remarkable
weakening of the boundary vorticity flux and boundary enstrophy flux
distribution. These changes result in a notable reduction in vorticity
generation near the elliptical cylinder wall.These alterations directly lead to
a substantial contraction in the distribution of vortex structures in the wake
of the elliptical cylinder, especially affecting large-scale vortex
structures.As a result,The elliptical cylinder noise suppression mechanism we
propose can effectively reduce aerodynamic noise.
