The declaration section for cells is similar to that for nodes.
(12 (zone-id first-index last-index type element-type))
(12 (0 1 3e3 0))
where NN and NF will vary, depending on the specific polyhedral cell.
Regular cell sections have no body, but they have a header of the same format where first-index and last-index indicate the range for the particular zone, type indicates whether the cell zone is an active zone (solid or fluid), or inactive zone (currently only parent cells resulting from hanging node adaption). Active zones are represented with type=1, while inactive zones are represented with type=32.
In the earlier versions of FLUENT, a distinction was made used between solid and fluid zones. This is now determined by properties (i.e., material type).
A type of zero indicates a dead zone and will be skipped by FLUENT. If a zone is of mixed type ( element-type=0), it will have a body that lists the element-type of each cell. Example:
(12 (9 1 3d 0 0)( 1 1 1 3 3 1 1 3 1 . . . ))