Creating an Arbitrary Match Control
An arbitrary match control can involve both translational and rotational components. To create such a control, with the Match tool active do the following:
- Identify the high and low faces whose parameters are to be matched.
- Select the axis of rotation and specify an Angle to determine the rotational component.
- Select a high vertex and the corresponding low vertex to determine the translational component.
- Click Complete to create the Match control.
After a Match control has been created, you may set, or modify, other mesh controls (Edge Size, Face Size, Mapped Mesh, etc.) on the high face. Changes will be applied automatically to the low face.
Notes regarding the creation of match controls:
Face meshes are matched across bodies.
A single match control with one high face and one low face cannot be applied across multiple bodies. If there are multiple faces on the high side and multiple faces on the low side, Meshing does its best to match the high and low sides on a body-by-body basis. For example, the match control will support situations in which there are two bodies, each having one face on the high side and one face on the low side (for a total of two high faces and two low faces). However, for more complex situations, you must be careful to ensure the proper matching is done.
Matching will fail if the high and low faces are on two separate bodies that have other bodies (being meshed with a method other than Sweep) or a space between them.
The faces or edges that you select must be topologically and geometrically the same. This means they following conditions are true:
They have the same number of vertices on the high and low sides.
They have similar surface area or length.
The high and low sides have similar transformation.
The mesher will move nodes away from the geometry to meet the transformation.
If the low and high sides of a geometry do not match, the high side geometry is meshed and the low side will be meshed using the transformation from the match control. In this case, the low side geometry and mesh might be slightly different, so a warning is displayed prompting you to check this deviation and decide whether it is acceptable or that you should modify the geometry.
Multiple match controls can be associated with a single entity, but multiple associations can result in conflicts among match controls. If a conflict occurs, Meshing issues an error message, and matching fails. For example, a match control conflict may occur if the two faces adjacent to an edge have two different match controls applied to them. If the two match controls use two different sets of coordinate systems, then an error may be produced even if the transformation between the two match controls is the same. However, for this case, if the two match controls refer to the same set of coordinate systems there won't be any conflict.
A match control can only be assigned to one unique face pair. Assigning the same face as High, or Low, Geometry in more than one match control is not supported. If multiple match controls assign the same face as a High, or Low, Geometry entity, only the last match control created is honored.
When Match is used with a Size control, the effect of a sizing on the high or low side will be transferred through the Size control bidirectionally from the high side to the low side and vice versa. This means that if the low side has a sizing control and the high side does not, the low-side sizing control will be applied on the high side. If both high side and low side have a size control, the control on the high side has priority.
Match controls are not enforced when previewing boundary layers.
When match controls on faces are used with Blocking, only one periodic or cyclic transformation is supported (Blocking can support multiple match controls, as long as they use the same coordinate system and have the same angle/translation). In addition, Blocking does not support matching of free meshed regions.