The research on designing ROV (Remotely Operated Vehicle) models is becoming increasingly simplified thanks to numerical simulation tools. By repeatedly conducting computational fluid dynamics (CFD) simulations, we can estimate dynamic coefficients such as thrust force, drag force, and moments, which are caused by fluid acting on the vehicle as it moves underwater, or by employing finite element simulations (FEM) to identify the deformation of the vehicle hull at different depths. From the estimated parameters obtained through simulations, we can adjust the design to achieve the optimal model. This article presents some fluid dynamics simulations for ROVs, utilizing computational fluid dynamics to determine lift force, drag force, moments acting on the ROV, as well as velocity distribution and pressure of the environment as the vehicle moves within fluid currents.