Why is there a blank space in my VTK map?

MFiX
#1

Hello everyone,
I drew the geometric structure of a hopper myself, but at runtime, there is a gap in VTK, what is the reason for this? Please help me. Thank you.

微信截图_20230719101701
微信截图_20230719101701947×608 23 KB

#2

Please attach your project files (main menu / Submit bug report) if you want someone to help with this.

#3

OK.This is my project files.
hopper3.2.zip (27.9 MB)

#4

You have some stretched triangles in the stl file that are ignore because the angle is less than the tolerance (0.1 degrees).

 STL file(s) successfully read.
Total number of facets read =        1052
Number of valid facets      =         960
Number of ignored facets    =          92

Go to Mesh>Mesher and set the facet angle tolerance to 0.