Error reading 3d eccentric annulus in Fluent
 

Hello friends, I am trying to create eccentric annulus in 3D.I am creating outer and inner cylinder and moving inner cylinder for eccentricity and the subtracting inner cylinder from outer to get eccentric annulus. after meshing faces and whole volume and specifying boundary conditions and velocity inlet and pressure outlet the mesh is exported to Fluent. In Fluent (selcted "Run fluent in 3D" at the begining of Fluent), when read case file the created it gives me error like " Error: no cells in zone, id = 0, ind1 = 1, indn = 0Reading Cells: failed while reading section 12.

Clearing partially read grid.

Error: Read aborted due to critical error. Error Object: ()" Any help is appreciated Parag