bad grid problem analysis
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I am using snappyHexMesh generating grid but it always has some very strange grid at the geometry surface. Can any expert tell the reason and solution? Thanks.

grid problem
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I used snappyHexMesh to generate mesh. I got this result as attached that the snap function cannnot capture the geometry (blue parts) accurately. Can any expert tell the reason and solution? Thanks.

The problem can be solved in some degree by adjust the snap controls setting.

grid problem
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I encountered a new problem that grid at some corners of the geometry has been very weird. Can any expert tell the reason and solution?
Thanks 
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grid problem
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I have finally fixed this problem.
it needs to be clarified that SnappyHexMesh does has the capability to snap even sharp corners of the geometry. The key parameters for this problem are: base mesh size nCellsBetweenLevels  6 //solve bad grids at STL surface resolveFeatureAngle  45 //value less than 90 could snap the perpendicular STL edge features{*.eMesh} //solve bad/rounded grids at STL surface edge refinementSurfaces{level(min,max)} //increase max value could help to snap edge more accurately in the same time keeping the STL surface grid size small nSmoothPatch  3 // setting this value a little bit larger help solve bad grid problem but not too large which would distort other good grids nFeatureSnapIter  5 //setting this value a little bit larger help solve bad grid problem but not too large which would increase iteration time significantly explicitFeatureSnap  true //would help snap features 
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