*tetmesh

• Must have at least one active input.
• Up to 7 inputs can be used but, each active mode value can appear no more than once.
• Modes 0, 1, 2, 3 and 6 are for boundary inputs of the meshing volumes. For these modes, inputs with entity_type as elems or comps are boundary inputs by elems; inputs with entity_type as solids or surfs are boundary inputs by geoms. All boundary inputs must be either all by elems or all by geoms.
  • For an input by elems with modes 0, 2 and 3, all elems other than 2D elems are ignored.
  • For an input with mode 1, both 1D (plotel) and 2D elems are acceptable. In this case, 1D elems specify the elem edges that must appear in the final mesh.
  • For an input with mode 6, all elems other than 3D elems are ignored.
• For inputs by geoms, all surfs without a pre-existing mesh are treated as float regardless of the mode of input. Internally, these surfs are auto-meshed with the 2D meshing parameters passed in through the string_array argument.
• There can be no more than one input with entity_type as solids. That is, if there is one solids input, all other boundary inputs must have entity_type as surfs. It is further required that all these surfs selections are on the selected solids (other surfs are silently ignored).
• For mode 4, entity_type must be comps. The selected entities must be the specially constructed components for size control boxes (others are silently ignored).
• For mode 5, entity_type must be nodes. The nodes that are too close to other anchor nodes or that are outside of the meshing volumes or too close to the boundary of the meshing volumes are ignored.
• For an input with mode 6, all boundary inputs must be by elems. All other boundary inputs are considered as 2D baffles (and 1D constraints). An empty input with mode 6 will be auto filled internally by the inputs of baffles (modes 0, 1, 2 and 3), size control boxes (mode 4) and anchor nodes (mode 5). Otherwise, all entities with input modes 0-5 that fall outside of the 3D selection or too close to the boundary of the 3D selection are ignored.
• If a single command has two active entity inputs, the mark_ids must be different.
• Inputs with different modes are allowed to have overlapping selections. The overlaps are resolved inside the command. The general rule is that the input in an earlier command has the higher priority; while within a command the later input has the priority. If an input has ent=solids, it always has the lowest priority regardless its position in the input order.

"tet: tet_opts growth_rate uniform_layers max_size qt_ratio min_size"

tet_opts

Tetra mesh options. Bit values are used and the value is calculated as (Bit0 + 2*Bit1 + 4*Bit2 + 32*Bit5 + 64*Bit6 + 128*Bit7 + 256*Bit8).

Bit0-Bit2: Core tetra mesh and optimization method.

• 0 – Unused.
• 1 – Normal.
• 2 – Optimize for performance.
• 3 – Optimize for quality.
• 4 – Generate boundary layer only. Valid only if there are boundary layer inputs.

Bit5-Bit7: Quad transition settings. Used only if there are fixed quad inputs.

• 0 – Keep quads as-is. Only valid for BL only mode.
• 32 – Build a layer of 1 pyramid per quad transition.
• 64 – Build a layer of 5 pyramids and 2 tetras per quad transition.
• 96 – BL hexas are split into prisms for all layers.
• 128 – BL elems are split into tetras for all layers.

Bit 8: Elems-to-geometry flag. Effective only for non-CFD meshes with inputs by geoms. For CFD mesh, the elems are always placed in fixed comps with special names. For all other cases, elems go to the current comp.

• 0 – Elements to current component.
• 256 – Elements to geometry component.

growth_rate

The tetra mesh elem size growth rate for the boundary (typical 1.2, range >1.0).

uniform_layers

The number of tetra layers that are to have uniform elem sizes (typical 2.0, range >0).

max_size

The limit on the max elem size. A value of 0.0 means no limit (typical 0.0).

qt_ratio

Affect only the quad transition layer. This determines the layer height as a fraction of the local 2D elem size (typical 0.8).

min_size

The nominal lower bound for the element size. A value of 0.0 means not bounded (typical 0.0).

"cfd: cfd_opts bl_thick0 bl_thicktotal bl_growthrate size_trans_flag"

cfd_opts

Flags for smooth/native boundary layer meshes.

Bit0: Split mode. Effective only for native boundary layers or when size_trans_flag=1.

• 0 – All 3D non-tetra elems are split into tetras.
• 1 – Prism and pyramid elems in the boundary layer are not split into tetras.

Bit1: The main boundary layer mode.

• 0 – Native boundary layer method is used.
• 2 – Smooth boundary layer method is used.

*createstringarray 1 "tet: 579 1.2 2 0 0.8 0 0"
*createmark comps 2 "inlet" "outlets" "wall" "wall_cyl"
*tetmesh comps 2 0 elems 0 -1 1 1

*createstringarray 1 "tet: 579 1.2 2 0 0.8 0 0"
*createmark comps 2 "some_3d_elems"
*createmark comps 1 "some_baffle_elems"
*tetmesh comps 2 6 comps 2 0 1 1

*createstringarray 2 "tet: 547 1.2 2 0 0.8 0 0" "2d: 1 0 1 4 0.8 30"
*createmark solids 1 4 5
*tetmesh solids 1 1 elems 0 -1 1 2

*createstringarray 2 "tet: 579 1.2 2 0 0.8 0 0" "cfd: 86 0.2 1 1.2 0"
*createmark comps 2 "inlet" "outlets"
*createmark comps 1 "wall" "wall_cyl"
*tetmesh comps 2 0 comps 1 2 1 2

if { [ catch {command_name...} ] } {
   # Handle error
}