Three Dimensional Hydrodynamic Simulation Of Supernova Remnant Evolution In Complex Environment

Supernova remnants are the candidates of the accelerator of the Galactic cosmic rays.Some of them have asymmetric morphologies which is usually related to the complex environment.Numerical simulations are helpful to investigate the cause of the special boundaries of the supernova remnants.We use the 3D HD simulations to study the dynamic evolution of the supernova remnants in homogeneous and heterogeneous interstellar media.RCW 103 is a young shell-type supernova remnant,and the X-ray observation shows that it has a bright southeast shell,and the radian of this region is more flat than that of the other side.MSH 15-56 is a composite supernova remnant with a bulge on the western boundary.We have studied the two supernova remnants with special boundary.The results show that in the interstellar medium with density gradient,the supernova remnant can have a special edge.For RCW 103,with the ejecta mass of 3.0 M?,the density of the background material of 2.0 cm-3,and the density gradient of 2.6-4.0 cm-3pc-1,the X-ray periphery can be generally reproduced.For MSH 15-56,with the ejecta mass of 10.0 M?,the ambient material density of n0=0.2 cm-3,and the density gradient of 0.2-3.2 cm-3pc-1,the bulge on the western hemisphere can be reproduced.