A numerical analysis was carried out to predict the defects caused by fluid flow and heat transfer in the casting process under centrifugal force. The VOF method was adopted to deal with the behavior of free surface during filling and the Temperature Recovery method was used to treat the release of the latent heat during solidification. Thermal stresses were calculated by the Finite Element method. For a cylindrical model, two different angular velocities were applied (900 rpm and 1,500 rpm), and the result showed that the intensity of circulating flow was weaker in the case of 1,500 rpm than that of 900 rpm. Solidification proceeded faster in the upper part of the casts due to the thinner thickness caused by the gravitational force. Tensile stresses were distributed along the outer surface of the casts, while compressive stresses were distributed in the inner part.