Numerical Investigation of Two Cylinders Passing each other, Using Overset Grid Method

In this paper, the interactions of flow over two circular or rectangular cylinders, passing by each other, have been investigated, using overset grids method. Two-dimensional incompressible governing fluid flow equations are solved using finite volume method. In this research, several interpolation methods have been tested to transfer data between grids. One of them called Mass flux base interpolation method has been presented. In addition, it is concluded that the overset grid method is very powerful to simulate fluid flow over moving bodies. The results are compared for lift, drag, and pressure coefficients with credential other numerical results. It is observed that in a short time interval, when two cylinders are passing by, a repulsion and then attraction force applies to each cylinder. In addition, drag force is reduced and then increased.