[nchuche]

Fig. 1 is my model. The origin part is a vessel (import by .stl file), and the green part is an extension. Two regions are fluid. The extension is built by means of “extrude mesh” method from INLET part. Then, I delete the mesh of the INLET part. Then, I make a .msh file and a .cfx file for for Fluent and CFX, respectively. Unfortunately, .msh file can not be read by Fluent, but .cfx file can by CFX. I can’t use CFX. Fig. 2 is the message of the Fluent. Who can tell me where the problem is and give me some suggestions to fix this ICEM file.
p.s. 1 If I didn’t delete the mesh of the INLET part, the .msh file can be read by Fluent. But the INLET part becomes a wall. This boundary is not my want.

(So strange, I can't attach my doc file....)
The message in the Fluent is
> Reading "E:\post doc\research\2010-biomechanics plan\plan\2010-Amira-chest-CT\chest CT model practice\20100609-tracheal\mesh\fluent3-1.msh"...
6432 nodes.
26534 tetrahedral cells, zone 14.
1500 wedge cells, zone 15.
51202 triangular interior faces, zone 16.
3445 mixed interior faces, zone 17.
100 triangular pressure-outlet faces, zone 18.
3557 triangular wall faces, zone 19.
460 quadrilateral wall faces, zone 20.
75 triangular wall faces, zone 21.
Building...
grid,
Cell Centroid is xc -4.454064 yc -7.567721 zc 440.377377
WARNING: cell 5 of thread 14 has NULL face pointer 3.Error: Build_Grid: grid error.
Clearing partially read grid.
Error: Null Domain Pointer
Error Object: ()

"Error: Null Domain Pointer"...I have seen many times in this forum, but I don't know how to fix my model.