Abstract
Vapor is formed in low and/or negative pressure regions in liquid phase. The formed vapor shrinks and disappears under increasing pressure condition. The former phenomenon is called cavitation and the latter is done vapor collapse. The vapor collapse causes noise and erosion. The vapor collapse processes in pseudo three dimensional model are simulated by molecular dynamics method with periodic boundary condition. The cylindrical shape vapor is mainly approximated to the vacuum. The vapor collapse processes are observed by using configuration of physical quantity mapped molecules. During vapor collapse process, atom level temperature becomes high and atom level potential energy does low at the gas/liquid interface. Just after the disappearance of the vapor, atom level temperature and potential energy increase at the center of the disappeared vapor in liquid phase. The distributions of physical quantities of molecule are transferred to continuum quantities under cylindrical coordinate.
