Form Composite Edges
The Form composite edges operation forms a composite edge for each connected edge component of the selected edges by ignoring the vertices between the edges, as shown in Figure 7-24. This means that it is possible to include several nonconnected groups of edges in the same operation. A vertex is only ignored if there are two edges connected to the vertex. All edges in the geometry must have distinct start and end points. the software will ensure this by preserving or inserting extra vertices, if necessary.
Figure 7-24: Forming composite edges will ignore the vertices between the edges highlighted in blue. The image on the right hand side shows the result after the operation is built. The two vertices (indicated by horizontal arrows) on the shorter circular edges are kept to ensure that the resulting edges have distinct start and end points. The vertex (indicated by the vertical arrow) along the longer circular edges is kept as there are more than two ingoing edges.
Removing vertices gives the mesh algorithm more freedom. A geometry vertex needs to be respected when creating a mesh, which may put unwanted constraints on the mesh if there are unnecessary vertices. Alternative operations to use are Collapse Edges, Ignore Vertices, and Merge Vertices. The Remove Details operation provides a fully automated way to create composite edges.
To use the operation, in the Geometry toolbar, from the Virtual Operations menu (), select Form Composite Edges (). Then enter the properties of the operation using the following sections:
Input
Select the edges that you want to composite in the Graphics window. They then appear in the Edges to composite list. If the geometry sequence includes user-defined selections above the Form Composite Edges node, choose Manual to select edges, or choose one of the selection nodes from the list next to Edges to composite.
Click the Active button to toggle between turning ON and OFF the Edges to composite selections.
Mesh Control
Use the Keep input for mesh control check box to specify that the selected edges are composed in the geometry but the vertices are available individually when you build the mesh. See also Mesh Control Vertices.
With the CFD Module and the Chemical Reaction Engineering Module, see Syngas Combustion in a Round-Jet Burner: Application Library path CFD_Module/Nonisothermal_Flow/round_jet_burner