snappyHexMesh+splitMeshRegions生成的多域网格，如何将域的边界分离

[ShaneHEEE]

各位大佬，请教一下，如图生成了外部atmosphere域和内部coolingTower两个流体域，如何将coolingTower和atmosphere接壤的顶面、底面和侧面分开，目前的边界只有

1
(
    coolingTower_to_atmosphere
    {
        type            mappedWall;
        inGroups        1(wall);
        nFaces          20526;
        startFace       103158;
        sampleMode      nearestPatchFace;
        sampleRegion    atmosphere;
        samplePatch     atmosphere_to_coolingTower;
    }
)

[李东岳]

如何将coolingTower和atmosphere接壤的顶面、底面和侧面分开

画个图，哪个是哪个？