Abstarct: Cavitation is a phenomenon that is occur when the pressure of a liquid falls below the saturation vapor pressure and cause the change of liquid to vapor. This phenomenon occurs in fluid-handling machinery and has both desirable and undesirable features. Desirable features of cavitation can be utilized in applications like viscous drag reduction by microbubble generation and undesirable features such as corrosion, noise etc. cavitator is a means that install on the nose of submerged body such as torpedo to generate supercavitation. Different kinds of cavitator are cone, hemicone, hemispherical and disk. In this thesis we used disk cavitator with eccentric hole to generate supercavitation. The purpose of this thesis is investigation of the cavitation effects on the cavity length and diameters and the drag coefficient on the cavitator with make different diameter and different position holes. For simulation of cavitation phenomenon used powerful available models in ansys fluent software like kω-sst turbulent model, multiphase mixture model and suare-schnerr cavitation model. Cavitator number 3 and 24 generate greater and smallest cavity rather than other cavitators respectively and the latter one has greater frictional drag coefficient. Cavitator with hole has less pressure drag coefficient than the one without hole while having cavity with smaller length and diameter.