Mechanical_Intro_14.5_L04_Meshing
.pdf
. . . Virtual Topology
In this example one edge of this multibody part has a size control assigned which causes irregularities in the overall mesh.
Virtual Split Edges
Initial Mesh
Size Control
Shown in the upper right, 3 edges are
“virtually” split to accommodate improved elements shapes.
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Final Mesh
Release 14.5
. . . Virtual Topology
Surface Model Example:
Virtual
Cell
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© 2012 ANSYS, Inc. |
December 19, 2012 |
Release 14.5 |
. . . Virtual Topology
“Virtual Topology” branch is added below the “Model” branch:
•Individual virtual entities do not appear in the tree. Instead, a statistics section in the details lists virtual entities.
•An automatic virtual topology function will attempt to create virtual cells based on the details settings.
•Automatic Virtual Topology:
–Low, Medium, High: Indicates how aggressively virtual topology will be searched for.
–Edges Only: Searches for adjacent edges to be combined.
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Release 14.5
. . . Virtual Topology
Virtual Cells can be created manually:
•Select the entities (faces shown here) to be included in the virtual cell.
•Choose “Merge Cells” in the context menu (or RMB > Insert > Virtual Cell).
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. . . Virtual Topology
In some instances it may be desirable to split a face to allow a specific meshing operation.
•With the Virtual Topology branch highlighted, select 2 vertices as the desired split point.
•Choose “Split Face at Vertices to complete the operation.
•Vertex selection may be comprised of existing vertices or virtual hard vertices can be created (see following slides).
• Note, selected vertices must both be associated with the face to be split.
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. . . Virtual Topology
Virtual split faces can be accomplished by creating virtual split edges (note the split faces utilize the vertices generated when the edges are split).
•“Virtual Split Edge at +”: splits at the selection point along the edge.
•“Virtual Split Edge”: requires a fractional entry indicating the position along the edge where the split will be located (e.g. 0.5 results in the line split in half).
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. . . Virtual Topology
A “Virtual Hard Vertex” feature allows the creation of hard points which can be used to split faces where no “natural” vertex exists.
•With the Virtual Topology branch highlighted select the face where the hard vertex is to be located.
•Note, a + sign will appear at the cursor location.
•Choose “Hard Vertex at +” (or RMB > Insert
>Virtual Hard Vertex at +).
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. . . Virtual Topology
Virtual entities can be reviewed, edited or deleted from the context toolbar (highlight Virtual Topology branch):
•Use the arrow keys to cycle through next/previous virtual entities.
•The virtual entity is highlighted graphically and the status bar (bottom of graphics window) indicates the current selection.
•The Edit icon allows access to an editor window where modifications to the virtual entity definition can be made.
•Use “Delete” to remove unwanted virtual entities.
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December 19, 2012 |
Release 14.5
. . . Virtual Topology
Keep in mind that the topology can change!
•Example: a chamfer is added to the top surface in this virtual cell. The interior lines are not recognized anymore.
Original mesh
Element’s edge is shown as a solid line and the original chamfer and top surface is shown as a dotted line.
The chamfer representation is no longer present.
Mesh using virtual topology
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E. Workshop 4.1 – Mesh Control
•Workshop 4.1 – Mesh Control
•Goal:
–Use the various mesh controls to enhance the mesh for the solenoid model.
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