1.
Simplify geometry as much possible while maintaining analysis intent (removal
of small radii, holes, chamfers, etc if insignificant influence on result).
This usually requires a dialogue with the person that generates the
IGES-file,- tell him/her what to
remove...
2.
Import the simplified geometry in ANSYS with all values set to default (from
version 6.0) - if no luck GOTO 3
3.
Have you other CAD-software in-house, like for instance Pro/E?
Try to import in this program, and then re-export and re-import to
ANSYS – if no luck GOTO 4
4.
You probably experience a classical accuracy/tolerance-issue, that is accuracy
of sending and receiving system is not in sync.
Now it's rock and roll - try different tolerance/accuracy settings for
importing the IGES-file from the ANSYS-dialog box.
Look at the OUTPUT window in ANSYS.
This
gives information of MIN RESOLUTION of the IGES-file.
Try to match this resolution/tolerance when importing - if no luck GOTO
5
5.
Even more rock and roll! Now, in sequential order, delete all keypoints
(keypoints attached to lines will still not be deleted), delete all lines
and below (lines attached to areas will still not be deleted).
Now try to create a volume by all areas - if no luck GOTO 6
6.
Now, do a merge of all keypoints with default settings.
Look in the output window to see if coincident keypoints, lines and
areas are merged into fewer entities. If
so, try to create volume by areas again - if no luck GOTO 7
7.
Now, do a merge of all keypoints with coarser settings.
Look in the output window to see if coincident keypoints, lines and
areas are merged into fewer entities. If
so, try to create volume by areas again - if no luck GOTO 8
8.
Try to create volume by areas again, but now after boolean settings
(under operate) are coarsened -
if no luck GOTO 9
9.
If available, try other 3D neutral formats like STEP, SAT and GOTO 3
and complete the loop - if no luck GOTO 10
10.
Cry for help!!!, or - give the job to the guy next door (and don't
forget to tell him it's piece of cake, it's just that you have too many
projects at the moment), or - get
CADFIX, or - remodel the stuff in ANSYS while all around you tell you
"Why don't you just import it dude?"