mesh generating outside the geometry


Hi all,
I have created a 3 D hollow cylinder with wavy outer surface and wavy inner surface swept helically. I have made the geometry fully mappable but when I am giving solid-meshing, elements are forming inside the hollow section of the cylinder also. when I am giving 2D auto meshing at one surface, the solid is becoming non-mappable.


Thanks for your reply sir. Sir, I somehow managed to meshed the geometry partly by automesh and tetramesh . Now I am having a problem with importing the mesh to fluent. They are showing notification about collectors/components in hypermesh while i am trying to import the mesh. when I am importing the mesh by neglecting this notification many errors are coming in fluent setup and even the quality of my mesh is very low of something to the power -4


Sir, I got the following attachment from a pdf( ) but I am not able to understand how to do the highlighted step. Can you please explain to me how to do this.
Please show an image