grid manipulation and applying boundary conditions
 

I am a new Fluent user. I have imported a mesh from ANSYS into Fluent. But I the mesh has only two zones: exterior and interior. The 2-D mesh is a cirle in a square. I need to apply boundary conditions to each wall of the square, and to the boundary of the circle. I need to simulate flow over a cylinder in 2-D where I have a top and bottom wall, a flow entrance and exit. How do I manipulate my grid, to obtain surfaces and zones that will allow me to place these boundary conditions.

Re: grid manipulation and applying boundary condit
 

The boundaries of Your problem (inlet, outlet, walls) are grouped together in the exterior zone. You have to split this zone (grid/seperate/faces) and to change the boundary zone types (define/boundary conditions).

Re: grid manipulation and applying boundary condit
 

Yes, but how do I proceed from grid/separate/faces? Do I need to learn how to apply marks and separate that way? I am having trouble from the point you recommended.

Re: grid manipulation and applying boundary condit
 

Yes, I think so! Try the feature "mark" in order to separate the square and the circle. You can apply marks via adapt/region. Then divide up the different zones of the square using "angle"