Enhancement and application of cut-paste algorithm

In order to increase the reliability of the traditional cut-paste algorithm in dealing with gap problems, distortion or significant discrepancy of grids, the concept of two-type hole point and double advancing front is proposed, and a new cut-paste method based on these new concepts is also proposed. The new method distinguishes the hole point type, making sure grids inside another object are not modified in the paste phase, and avoiding penetration into wall surface in gap problem. The new method changes the traditional single advancing front in paste phase into double advancing front , while the two layers could be activated and checked in the same time to ensure that two layers of effective interpolation boundaries are set up in the overlapping area. The test cases show that the improved cut-paste method could enhance the adaptability of chimera method effectively in dealing with complex situation of gap problem, distortion or significant discrepancy of grids etc.