- Select Mesh->Structured->Lines->Concentrate elements .
- Select some structured lines, for example line 43. Press ESC .
- A window comes up in which to enter two values for the concentration of elements. Positive values concentrate the elements and negative values spread them. Enter 0.5 as Start Weight and –0.5 as End Weight 10 . Click Ok and press ESC .
- Select Mesh->Generate mesh .
- A window opens asking whether the previous mesh should be eliminated. Click Yes .
- Another window appears in which to enter the desired element size. Leave the default value unaltered. The result is the mesh shown.
It is also possible to assign sizes to geometrical entities, so that mesh elements can be concentrated in certain zones. In the following steps some examples are given.
- Select Mesh->Unstructured->Assign sizes on points.
- A window appears in which to enter the size to be assigned to points. Enter 0.1 and click Assign .
- Select point number 15 and press ESC .
- Another window appears in which to enter the size to be assigned to points. In this case, we do not want to assign sizes to any other points, so click Close .
- Select Mesh->Unstructured->Assign sizes on lines.
- A window appears in which to enter the size to be assigned to lines. Enter 0.5 and click Assign .
- Select line number 25 and press ESC .
- Another window appears in which to enter the size to be assigned to lines. In this case, we do not want to assign sizes to any more lines, so click Close .
- Select Mesh->Generate mesh .
- A window appears asking whether the previous mesh should be eliminated. Click Yes .
- Another window appears in which the desired element size should be entered. Leave the default value unaltered and click OK . The result is not the desired, we just get the previous mesh. This is because surrounding surfaces and lines are structured, so they do not have enough freedom to achieve the given sizes.
- Select Mesh->Unstructured->Assign entities->Surfaces.
- Select Surfaces 26 and 12. Press ESC .
- Select Mesh->Unstructured->Assign entities->Lines.
- Select lines 48, 26 and 27. Press ESC .
- Select Mesh->Generate mesh .
- A window appears asking whether the previous mesh should be eliminated. Click Yes .
- Another window appears in which the desired element size should be entered. Leave the default value unaltered and click OK . The result is the mesh shown.
10 Start Weight and End Weight refer to the start point and end point of the line, oriented as it is drawn with an arrow in light blue when you select it.