Abstract: To simulate a common fluid phenomenon of bubble in our daily life,a physically-based bubble creation algorithm is proposed,and a method for extending the traditional VOF(volume of fluid) method used in the simulation of two immiscible fluids,to the multiple immiscible fluids is also proposed.In the bubble creation algorithm,the divergence of velocity field in the simulation region is modified to simulate the volume expansion,caused by the phase change between the fluid and vapor.In the extended VOF method,Skin-Onion scheme is used to combine the VOFs,which describe the interfaces among the fluids,and the interfaces can be correctly traced and reconstructed.Finally,the test results show that the algorithm can be used to achieve a pleasant visual effect.