## Transition Between Two Parts Glued Together
Two parts can be glued together using the block boundary feature.
This assures that the coincident nodes in the two parts are identical.
If the number of elements in one part is half or double the number in
the other part, then a row of hex (quad shell) elements at the interface
are automatically replaced with a row that sews the two parts together to
produce a node for node, edge for edge, and face for face matching
across the parts interface.
The transition is also automatically formed if the ratio between the parts
is 1:3.
These transitions can be layered to radically change the mesh density. The example below has three transitions in two directions with a transition scale factor of 12 in each direction.
Frequently, a part is needed that cannot be meshed with a simple block. If this part is in the interior where surrounding parts dictate the number of elements along the boundary of the part, a complex solution is needed. Several parts are constructed with transitions between them. Below is an example with three parts and three wedge columns. The wedges are easily formed by collapsing a face of a hex element.
All boundary conditions, initial conditions, and properties are maintained along when the trasitional element substitution is made. This feature can be abused because, by the very nature of these transitions, the quality is limited. In particular, the angles can be severe and can introduce numerical errors in the simulation. It is best to place these transitions in areas of low interest.
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