Fluent v4 requires that your multiple block grid fit together into one large
block. If Pointwise cannot assemble your multiple block grid into a single
block grid when exporting data for Fluent v4, you will receive an error
Fluent v4 does not allow poles (line singularities). Instead, use a small
cylinder of finite radius. Pointwise does not detect and warn of the existence
of poles during export. Both 2D and 3D structured grids are supported.