| The research for multi-media fluid interface problems has been a hot field in computational fluid dynamics for many years. The interface issue usually refers to a large physical discontinuity in fluid computational region, and the motion of fluid interfaces under this circumstance is what we concern. Among all these, the accurate description of moving interface is the core. There are many numerical algorithms dealing with these problems, they can be divided in two kinds of ways by using the coordinate system. One way is the Lagrange algorithm and the other is Euler algorithm. They are both widely used.This paper mainly studies the numerical simulation algorithms for the motion of multi-media fluid interface and introduces some common used computational methods, such as the tracer particle method, VOF, Level Set, Front Tracking and so on. We have compared the advantages and disadvantages of the four methods. Since the Front Tracking method can trace the moving interface with high precision but lack of the ability to deal with large deformation and interface topological changes, we have done some improvements and proposed an improving Front Tracking method. In this paper, we have done the theoretical derivation and numerical solution for the improving front tracking method and made a program. We have chosen two different computational tests to testify the accuracy of the improving method. One is the cylinder object puncture through the target; the other is the positive and negative velocity interface test. They are both in two dimensions. And we also compared the results with Level Set method.In this paper, we have introduced HELP and LSFC computational program briefly. We have coupled the improving Front Tracking thoughts with LSFC program and selected the copper round shape object puncturing target test to testify the accuracy and computing resource consumption of the coupled program. We have also compared the results with LSFC program and got a convincing conclusion. |
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