عنوان مقاله [English]
Careless attention to interfaces may causes rigorous errors in the numerical simulation of multimaterial flows, even in high resolution numerical methods such as the PPM.To avoid this problem, interface tracking methods are used. In these methods, the position and geometry of interfaces are determined in each time step. Then the properties of mixed cells are calculated by specific relations that are named mixture model.In the present work, the PPM Godunov type method of Colella is implemented to solve a compressible flowfiled composed of two different fluids. Among several proposed interface tracking methods, the VOF method is selected.Two mixture models; the isobar-isoenergy and the constant volume fraction, are used, and the results of their implemetation are compared. The results indicate the importance of using a tracking method for multimaterial flow filed simulation. Current study shows that the isobar-isoenergy model have a better performance, with respect to the constant volume fraction method.