mesh generation problem

Ellen

Hi,

I met a problem generating a mesh using Gambit. This is my first time generating a 3D mesh, and the model I created is:

create a big water tank (cylindrical) with its axis in Z direction;

create an inlet pipe (cylindrical) with its axis in y direction;

insert the inlet pipe into the tank, so one end is open to atmosphere and the other end is inside the tank;

generate a hex mesh for the tank, and another mesh for the pipe, then defined the boundary type for the tank wall, pipe wall and pipe inlet (the end that is outside of the tank);

when I read this mesh into Fluent, the pipe end which is inside the tank becomes a "new-wall", and I can't find any suitable type to re-define it, thus the case couldn't run.

In Gambit Tutorials, I saw meshes with intersecting pipes, but didn't find any cases with one pipe inside another. It seems to be simple problem, but I tried several ways to generate the mesh, and just couldn't make it work. Could anyone here please give me a hint? Thank you so much.

regards, Ellen