Proximity Size Function In ANSYS Meshing(Illustrated Expression)

As we stated in various article in Mechanical Base about ANSYS Meshing, the shape of your geometry defines the general options and optimizations of the mesh structure. So shape of the geometry that used in Finite Element Methods(FEM) defines the mesh structure. ANSYS also has very useful tools to define the mesh structure according to your geometric shape. One of them is Proximity Size Function option in ANSYS Meshing. In this article we will show;

  • What is Proxmity Size Function in ANSYS Meshing,
  • Where to use Proximity Size Function,
  • How to adjust the Proximity Size Function in ANSYS Meshing.

Proximity Size Function Option In ANSYS Meshing

Adjust the Proximity Size Function in ANSYS Meshing.

The default option for Size Function in ANSYS Meshing is ‘Adaptive’. In this option, the system defines the Size Function values according to your geometric shape and the default values of the selected Size Function is used in ANSYS Meshing.

Proximity Size Function gives the advantage of define the minimum element layers in the geometric features that inludes ‘gaps’. So if there is a internal volumetric gap or area between two opposing faces, you can define the number of layers of mesh elements in this faces for the accuracy.

You need to define below properties for Proximity Size Function;

Proximity Size Function parameters in ANSYS Meshing.
  • Num Cells Across Gap: The minimum number of layers of mesh elements value that you need to define.
  • Proximity Size Function Sources: This is the options of where proximity calculations will be performed.
    • Faces: Only face to face proximities will be considered in proximity calculations.
    • Edges: Only edge to edge proximities will be considered in proximity calculations.
    • Faces And Edges: Face to face and edge to edge proximities will be considered, but not the face to edge proximities are considered.
  • Proximity Min Size: You can enter a minimum size of elements that will be used in proximity calculations. The default equals to the Min Size. But you can also define different value for this.
  • Max Tet Size: The maximum element size the size function returns to the mesher.
  • Growth Rate: Defines the growth of mesh elements in each succesive layers. For example if you enter the value of 1.5, the size will be grown 50% in each layers.

So the whole Proximity Size Function calculations will be performed according to these parameters that you entered in ANSYS meshing.

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