zoneGenerator 与 CFD 直接网格分区
在之前的OpenFOAM版本中，网格区域（pointZone、cellZone、faceZone）的管理往往需要多个工具配合使用，操作流程相对繁琐。v13版本全新开发的动态区域生成系统彻底改变了这一局面。
核心亮点：新的zoneGenerator能一键生成包含pointZone、cellZone、faceZone任意组合的zoneSet，再也不用手动挨个创建区域了。
具体来说，该系统包含了多个zoneGenerator，用于创建和控制动态区域。另外，faceZone的flipMap（方向翻转映射）也迎来了人性化调整：现在它变成可选配置了，如果后续需要调整方向，用flipMap zone generator就能轻松补上。再也不用为了一个可选的方向参数，在配置文件里写一堆冗余代码了。
代码层面的改进主要体现在commit da974812、b4339ca4和a578e1e8等提交中，引入了全新的动态区域生成架构。
CFD direct Intro
https://cfd.direct/openfoam/free-software/dynamic-zones/
New Design of Zones
In the new design, a zone can be static or dynamic. A static zone can be created as part of the meshing process, or using the new createZones tool, configured through a createZonesDict file. Static zones are written to relevant cellZones, faceZones and pointZones files in the polyMesh directory, and can still update due to refinement/un-refinement of cells as before.
Alternatively, a zone can also be generated dynamically within a utility application, e.g. setFields and solver applications, i.e. foamRun or foamMultiRun. Dynamic zones for a CFD simulation are configured in a zonesGenerator file and are regenerated during a simulation in cases where the mesh moves, or due to any topological change (unless the user can instruct them to remain unchanged).
