The first and most important step of the casting method is that the liquid metal completely fills the mold cavity. One of the common mistakes in the casting process is that the liquid metal does not fully fill the mold cavity. For this reason, there is a need to improve the fluidity properties of aluminum alloys, the usage area of which is expanding thanks to its many advantageous properties. The aim of this study is to examine the parameters affecting the fluidity in the casting of Al12Si alloy by modeling techniques. The effects of varying pouring height, casting temperature and mold preheating temperature on fluidity in different section thicknesses were investigated in permanent mold casting. A specially designed mold with 2 mm, 4 mm, 6 mm and 8 mm section thickness was used in the study. Modeling studies were carried out with the FlowCast filling module, which is integrated into the SolidCast Casting simulation program. When the results are examined; It has been determined that all parameters play an active role on fluidity and different filling levels in different section thicknesses.