Assign size to points

• Select Mesh->Unstructured->Assign size on points. A window appears in which to enter the element size around the points to be chosen. Enter 0.1 and click Assign.
• Select the point indicated in the figure. Press <Esc> ⁴ to indicate that the selection of points is finished, and Close the window.
• Select Mesh->Generate mesh.
• A window opens asking whether the previous mesh should be eliminated. Click Yes.
• GiD then asks you to enter the general maximum element size. Leave the default value unaltered and click OK.

• Click View mesh in the pop up window to see the result.

  Geometry of the model. The point around which the mesh will be concentrated.

  The mesh with a concentration of elements around the point.

• A concentration of elements appears around the chosen point, given the selected size (0.1) of these elements.

One can control the way the size of the elements changes from a finer to a coarser region:

• Go to Utilities and open Preferences window. In the Meshing - General branch there is the option Size transitions. This option defines the transition gradient of element sizes (size gradient), whose values are between 0 and 1. The greater the size gradient is, the sharper change of sizes in space. To test this, enter the value 0.4 and click Apply.
• Again, generate the mesh (Mesh->Generate mesh) with the same general mesh size.

• The size gradient (0.4) results in a higher density around the point (see figure).
• Now go back and enter 0.6 in Size transitions. This will result in a mesh more suitable for our objectives. Click Apply.

⁴ Instead of pressing the <Esc> key, the center mouse button or the mouse wheel can also be used.