Numerical Study of Motion of Solid Cylinder Falling to Wall in Fluid

Abstract

A numerical analysis of incompressive flow around a solid cylinder which falls to a solid wall was performed to study the effect of fluid on the interaction between solid bodies. A time-dependent boundary-fitted coordinate system and a transformable grid which moves arbitrarily were adopted in order to express unsteady and relative motion of solid boundaries. The fluid force acting on the cylinder was calculated directly by integrating the stress and the pressure on the surface without using any models. The effect of the induced pressure on the behavier of the cylinder was studied, and the results were compared with the analytical theory of lubrication. The obtained pressure in the gap showed similar profiles to the one derived from the lubrication theory. Furthermore, it was studied about dominant effects on the motion of the cylinder in the fluid, especially about the effect of the unsteady motion of the cylinder. In addition, it was examined the effect of the inclination of the wall to the motion of the cylinder.