Novel overlapping optimization algorithm of overlapping grid and its applications

Highly automated overlapping optimization algorithm plays an important role in the overlapping grid. In view of the fact that the result of grids optimized by cut-paste algorithm is not determined and predictable, a new mixed overlapping optimization algorithm is presented which combines the distance optimization principle with the cut-paste algorithm. The distance optimization principle has been adopted to deal with the grids between objects. Hence the fringe boundary layers will be located at the field between objects to make the location of overlapping area better and more predictable. By maximizing the distance value for background grid, we cut the background grids which fall into the grids of other objects. Meanwhile the cut-paste algorithm is employed to optimize the grids, which are overlappingped near or on the wall. The new mixed algorithm improves the quality of overlapping and it is totally automatic. With the enhanced algorithm, three typical aerodynamic cases are performed and excellent agreement of computational results compared with experimental data has been achieved. Moreover, the flow variables at the overlapping zone are transferred accurately, the contour has smooth transition to different grids and the flow describes accurately. The enhanced algorithm shows greater accuracy and practicality than the previous methods.