GEOM Issue - Mesh>Cylinder>Cap Fill Type "Nothing">Add Modifier>Solidify (Update)

[John S.]

I wanted to update this issue in FDS Discussion before posting it to Issue Tracker.

1) Can you tell me if it is possible for Blender FDS to code with GEOM a solid made with the following method?

     - in Blender I used: Add>Mesh>Cylinder>Cap Fill Type "Nothing" then Add Modifier>Solidify to create a hollow cylinder with a 1 mesh width (.005m)

2) I brought the issue up to Blender FDS discussion, it was suggested I post here.

3) I checked sanity and intersections with no issues.  Doesn't seem to be overlapping.  The code gives the following error on FDS6.7.6-0-g5064c500c-release:

```

forrtl: severe (157): Program Exception - access violation

Image              PC                Routine            Line        Source

fds.exe            00007FF63F845E25  Unknown               Unknown  Unknown

fds.exe            00007FF63F876248  Unknown               Unknown  Unknown

fds.exe            00007FF63F872383  Unknown               Unknown  Unknown

fds.exe            00007FF63F826E5D  Unknown               Unknown  Unknown

fds.exe            00007FF63F8DA7C9  Unknown               Unknown  Unknown

fds.exe            00007FF63EFB47D7  MAIN__                    464  main.f90

fds.exe            00007FF63EF72F3E  Unknown               Unknown  Unknown

fds.exe            00007FF63F963D28  Unknown               Unknown  Unknown

KERNEL32.DLL       00007FFB72067C24  Unknown               Unknown  Unknown

ntdll.dll          00007FFB723ED721  Unknown               Unknown  Unknown

```

Find my code attached.

If there is an alternative way to make a hollow cylinder with GEOM, please let me know.

[John S.]

Update:

It has been suggested that the code is formally correct from a BlenderFDS perspective, but FDS does not currently support GEOM-GEOM GEOM-OBST intersection. Even two GEOMs that are too close (less than cell size) can give the same problems.

Can anyone confirm?

I will try to make objects an only GEOM object by boolean addition.  This has been tested in FDS to work.

[John S.]

Also, are GEOMs only considered "hollow" for heat transfer purposes?