Numerical Simulation on Interaction of Multiple S-Shaped Turbines

In this study, we investigate the flows around two S-shaped turbines rotating inversely by numerical simulation. In general, a rotational coordinate system is often used. When analyzing the flow around a rotating object, however, it is difficult to calculate with such coordinate system when two objects rotate in the reverse direction. Therefore, we use the overset grid that consists of two rotational coordinates for each turbine immersed in a steady coordinate to calculate such system of turbines. In this study, two-dimensional simulations for two turbines rotating inversely are performed, and the influence of interaction is investigated.