6 Pages

Wake Galloping of Cylinder Group

WithJiří Kala

Aeroelasticity is the term used to denote the field of study concerned with the interaction between the deformation of an elastic structure in an air stream and the resulting aerodynamic force. The interdisciplinary nature of the field can be illustrated as interaction of the three disciplines of aerodynamics, dynamics, and elasticity. Classical aerodynamic theories provide a prediction of the forces acting on a body of a given shape. Elasticity provides a prediction of the shape of an elastic body under a given load. Dynamics introduces the effects of inertial forces. In aeroelasticity it can be found that the loads depend on the deformation (aerodynamics), and the deformation depends on the loads (structural mechanics/dynamics); thus one has a coupled problem. Consequently, prior study of all three constituent disciplines is necessary before a study in aeroelasticity can be undertaken. The present article will consider aeroelasticity behaviour of the group of structures. The most significant phenomenon is wake galloping (also called buffeting) on cylinder shape bodies. A non-deformed circular section was presumed. The relation between the wind attack angle and civil engineering structures response was observed. To obtain the wind resultant induced pressure on bodies’ surface, the Computational Fluid Dynamics model with Fluid-Structure interaction ability was used. For verifying the numerical model, the experimental visualization of the stream behind a single rigid cylinder was used. To solve CFD and FSI, ANSYS program system was used.