Investigation and enhancement of hole mapping method

In order to reduce the storage of the traditional hole mapping method, a minimum hole mapping algorithm was presented which expands the concept of closure. Wall surface was allowed to terminate on truncation surface of grids, which would efficiently reduce the area of hole mapping and save the storage. Methods of hole mapping cell identification suitable for the generalized closure were analyzed, showing the unreliability of using wall surface information to identify the property of hole mapping cell. A new method named Inverse mark was developed which is especially suitable to the generalized closure. Mesh nodes' information was used to automatically identify out points, which are initial points to advance inside of the grid region. Results show that Inverse mark is of great efficiency, good reliability, and high automation, and can effectively enhance the flexibility of chimera grids to local complex configurations such as slits.