When I generate mesh with Gambit, if I use Fluent 4 as the solver, there is no problem to export the mesh, however, if the solver Fluent 5/6 is used, there always error mesg indicating 'boundary entity XXX does not contain any valid entity and is not written'.

I just created a 2D rectangle directly, and meshed it, then defined the boundary condition ( wall for upper and lower edges, and velocity_inlet for left and pressure_outlet for right edge)

Could any one tell me what is wrong ? Thanks

I think for Fl5/6 in the export window you have to specify "Export 2D".

Thanks for your reply, Bashu.

Could you tell me where is the option 'Export 2D' ? I can not find it in the export list.

when you export the mesh, you will see the option "export 2d" just choose it

Thank!