Numerical simulations are being used to ensure safety in the development of flying cars, which are expected to solve all kinds of traffic problems. In order to reproduce flight in a virtual environment, this research has been conducting numerical simulation research using the moving computational domain method and the multi-axis sliding mesh method to calculate the coupling of fluid and rigid body motion. This method enables rotational motion of the rotor and flight in an infinite region, and visualization of the flow field around the aircraft and its behavior including control. In this study, a comparison of the behavior during sudden rotor stops was performed on two different aircraft: the coaxial contra-rotating octorotor eVTOL treated in a previous study and a newly modeled domed dodecarotor eVTOL. The increased number of rotors and the wider circular arrangement of the rotors allowed for a wider range of measures to be taken in the event of rotor stoppage, and the crash risk was reduced by a factor of approximately 1/100. The differences in crash conditions and changes in aircraft attitude based on a comparison of the two models indicate that this calculation method allows for design improvements and behavior prediction based on relative evaluation.