Ansys Meshing – Match Control

Written by cfd.ninja

April 16, 2020

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Source: Ansys

The Match Control matches the mesh on two or more faces or edges in a model. The Meshing application provides two types of match controls—cyclic and arbitrary.

The Match Control is supported for the following mesh methods:

Volume Meshing:

Surface Meshing:

Remember the following information when using the match control feature:

  • Edge meshes are matched for sheet, 2D, and 3D bodies. Face meshes are matched across bodies.
  • A single match control with one high face and one low face cannot be applied across multiple parts. If there are multiple faces on the high side and multiple faces on the low side, the software does its best to match the high and low sides on a part-by-part basis. For example, the match control will support situations in which there are two parts, 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 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, the Meshing application 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 the mesher may produce an error 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/Low Geometry in more than one match control is not supported. If multiple match controls assign the same face as a High/Low Geometry entity, the match control that appears lowest in the Tree is honored.
  • Match controls are not respected with refinement or adaptivity.
  • When match is used with the Sizing Options, the effect of a sizing on the high or low side will be transferred 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 Sizing control will use the low sizing control on the high side.
  • Match controls on faces are supported with Pre inflation, regardless of whether inflation is set to Program Controlled or has been set through any global or local inflation definition. In contrast, match controls on edges are not supported with Pre inflation. Match controls (both faces and edges) are not supported with Post inflation. For non-supported cases, ANSYS Workbench automatically suppresses/disables the Match Control feature.
  • Match controls are not enforced when previewing inflation.
  • You cannot apply a match control to topology on which a face-edge pinch, mesh connection, or symmetry control has been applied. In any of these cases, an error will be issued when you generate the mesh.
  • Match controls are not supported for assembly meshing algorithms.
  • Match controls on edges are not supported for the MultiZone mesh method. When match controls on faces are used with MultiZone, only one periodic or cyclic transformation is supported (MultiZone can support multiple match controls, as long as they use the same coordinate system and have the same angle/translation). In addition, MultiZone does not support matching of free meshed regions.
  • Match controls can be used with thin sweeping, as shown in the figures below. In the figure on the left, a match control was applied to the top and bottom faces. In the figure on the right, a match control was applied to the side faces.

In this tutorial, you will learn to use Mapped and Match Control tools using Ansys Meshing. With this tool you can generate localized mesh.

 

Tutorial: Body of Influence using Ansys Meshing.

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