洞映射方法的研究和改进

针对传统洞映射方法存储大的缺点,对"广义封闭"的概念进行扩展,提出了最小洞映射方法,该方法允许挖洞曲面结束于网格截断面,有效缩小了洞映射区域,节省了存储开销.对适用于广义封闭的洞映射单元识别方法进行了分析,指出了用物面信息判断映射单元属性可靠性较差.发展了一种新的特别适合广义封闭问题的识别方法:"Inverse mark",使用计算网格结点信息自动识别洞外单元,再作为初始点在网格内部推进.研究表明:"Inverse mark"方法计算效率高,可靠性好,自动化程度高,有效提高了重叠网格方法对缝隙等局部复杂结构的适应性

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.