The output messages that AFLR3 generates identify progress and vary as the program enters different phases. The primary phases are described below.

AFLR3 has the capability to generate boundary-layer (BL), structured-layer (SL), or specified-normal-spacing (SNS) regions adjacent to specific surfaces. If BL/SL/SNS grid generation is requested then the ANBL3 library is used and the different phases include the following.

ANBL3 BLC: BL BOUNDARY CONDITIONS CHECK

Check BL/SL/SNS related parameters.

ANBL3 BLG: BL NODE GENERATION

Generate all grid nodes in the BL region.

ANBL3 BLS: BL SURF GRID GENERATION

Re-generate surface grid on planes that intersect the BL/SL/SNS region, typically symmetry planes, if there are any.

ANBL3 BLM: BL VOLUME GRID MERGE

Create elements and merge BL/SL/SNS region with isotropic region.

During isotropic grid generation the AFLR3 library is used and the different phases include the following.

AFLR3 IC : INPUT SURFACE GRID CHECK

Check the input surface grid and isotropic grid generation parameters.

AFLR3 IG : INITIAL VOLUME GRID GENERATION

Generate an initial tetrahedral grid that includes the boundary surface faces and nodes. If BL/SL/SNS grid generation is selected then the boundary surface includes the interface surface between the BL/SL/SNS and isotropic regions and re-generated surfaces if there are planes that intersect the BL/SL/SNS region.

AFLR3 IGb:

If difficulties arise during boundary surface face recovery for generation of the initial grid then the problem areas are treated as isolated regions and progressively riskier procedures are used. An output FAIL file named case_name.SUBGRID.FAIL.surf is temporarily written and then deleted if the sub-grid procedures are successful. Entering this phase is not necessarily an indication that there are problems. However, if a considerable amount of CPU time has elapsed during the sub-grid procedure then a failure is often the outcome. If the job is killed then the temporary FAIL file can be used to help diagnosis.

AFLR3 SG : SOURCE NODE GRID GENERATION

If the option to create a source node grid for interpolation of the local length scales is selected then generate a triangulation that includes the boundary surface nodes and input source nodes.

AFLR3 GG : ISOTROPIC VOLUME GRID GENERATION

Generate isotropic grid nodes.

AFLR3 GGi:

Create new nodes in clusters of ideally placed nodes at centroids of large elements that have all edges much longer than the distribution function.

AFLR3 GGs:

Create new nodes in clusters of ideally placed nodes for length scale refinement of elements with large length scales.

AFLR3 GGo:

Create new seed nodes in clusters of ideally placed nodes centered at the oct-tree bin centroids for the source nodes.

AFLR3 GGc:

Generate isotropic grid nodes using centroid point placement.

AFLR3 GG :

Generate isotropic grid nodes using advancing-front point placement.

AFLR3 QI : QUALITY IMPROVEMENT

Improve the final isotropic grid quality using smoothing and local reconnection.

AFLR3 QRG : QUALITY GRID REGENERATION

If BL/SL/SNS grid generation is requested and there are planes that intersect the BL/SL/SNS region then the AFLR2 library is used and the different phases include the following.

AFLR2 IG : INITIAL GRID GENERATION

Generate a triangulation of the boundary edges.

AFLR2 SG : SOURCE NODE GRID GENERATION

If the option to create a source node grid for interpolation of the local length scales is selected then generate a triangulation that includes the boundary edge nodes and input source nodes.

AFLR2 GG : ISOTROPIC FIELD GRID GENERATION

Generate isotropic grid nodes.

AFLR2 QI : QUALITY IMPROVEMENT

Improve the final grid quality.

AFLR2 IE : ISOLATED EDGE REMOVAL

Split any interior edges that connect only to boundary edges (isolated corner triangles).

If multi-partition mode is requested for isotropic grid generation then the AFLR3P library is used and the different phases include the following.

AFLR3P PG: PARTITION GRID

Partition the existing isotropic grid.

AFLR3P PP: PARTITIONED GRID GENERATION

Continue isotropic grid generation within each partition.

AFLR3P SG: SEPARATE PARTITIONED GRID

Separate each partition into completed and unfinished regions.

AFLR3P CP: COMBINE UNFINISHED PARTITIONS

Combine all unfinished regions for further partitioning and grid generation.