ABSTRACT
ABSTRACT: Rain-wind induced vibration is a well-known phenomenon affecting structures. It occurs under windy conditions with a moderate rain and causes large amplitude vibrations of slender structures with a low damping ratio. Such vibrations have been observed on horizontal and inclined cables and rarely on vertical hangars. This paper presents a numerical method based on fluid-structure interaction for simulating a rivulet motion on cylinder surface. The numerical simulation has been applied with a uniform inlet flow velocity to identify the aerodynamic forces acting on the vertical cylinder with a rivulet. An incompressible fluid flow with Navier-Stokes equations has been applied. Considering the flow velocities and stresses in a very close area of the cylinder surface, the former position of the water rivulet has been considered leeward. The water rivulet oscillated in a narrow region near the initial position. Aerodynamic forces lightly decreased comparing to the flow past the dry cylinder.
