在用snappyHexMesh对复杂地形生成网格时发现下述问题，未能找到根除办法，还请有碰到过同样问题的朋友讨论讨论：

报错信息：

Determining displacement for added points according to pointNormal ...
Detected 0 points with point normal pointing through faces.
Reset displacement at 0 points to average of surrounding points.

displacementMedialAxis : Smoothing using Medial Axis ...
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::medialAxisMeshMover::calculateDisplacement(Foam::dictionary const&, Foam::Field<double> const&, Foam::List<Foam::snappyLayerDriver::extrudeMode>&, Foam::Field<Foam::Vector<double> >&) at ??:?
#4  Foam::medialAxisMeshMover::move(Foam::dictionary const&, int, Foam::List<int>&) at ??:?
#5  Foam::snappyLayerDriver::addLayers(Foam::layerParameters const&, Foam::dictionary const&, Foam::List<int> const&, int, Foam::decompositionMethod&, Foam::fvMeshDistribute&) at ??:?
#6  Foam::snappyLayerDriver::doLayers(Foam::dictionary const&, Foam::dictionary const&, Foam::layerParameters const&, bool, Foam::decompositionMethod&, Foam::fvMeshDistribute&) at ??:?
#7  ? in "/home/lsfluid/OpenFOAM/OpenFOAM-10/platforms/linux64GccDPInt32Opt/bin/snappyHexMesh"
#8  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#9  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#10  ? in "/home/lsfluid/OpenFOAM/OpenFOAM-10/platforms/linux64GccDPInt32Opt/bin/snappyHexMesh"
浮点数例外 (核心已转储)

2.处理过程：
更改snappyHexMeshDict中addLayersControls参数featureAngle从180到120，网格如下所示。大部分网格生成边界层，一个角落未生成边界层，若继续增加featureAngle将报上述错误。
3.期望：
* 知道上述错误缘由和其他处理方法；
* 希望能增大featureAngle，使地形曲面能全部添加边界层。

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