Geometry Cleanup

When boundary vertices are located very close to each other, this can cause modeling problems in Slide, particularly with the finite element mesh for steady state or transient groundwater analysis. When vertices are nearly coincident, this will often result in a poor quality finite element mesh at that location (e.g. long thin "sliver" elements). This can create problems with the numerical analysis, and in the worst case, can lead to incorrect analysis results, or a model which does not compute at all.

Closely spaced vertices may occur for a number of reasons, e.g. automatic intersection of boundaries in Slide, inaccurate snapping, import of boundaries from DXF files, creation of 2D sections from 3D geometry, manual digitizing procedures, etc.

The Geometry Cleanup option allows you to "clean up" the model geometry by merging vertices which are very close to each other into a single vertex, according to a user-definable spacing criterion.

Three vertices merged into one using Geometry Cleanup


To use Geometry Cleanup:

  1. Select Geometry Cleanup from the Boundaries menu.

  2. You will see a dialog which allows you to choose the Merging Criteria and the Working Area.

  3. Merging Criterion - the merging criterion can be specified in relative or absolute terms.

  1. Working Area - you can choose to check the entire model or any portion of the model.

  1. Select OK. If you chose either of the window options (step 4), you will be prompted to graphically enter two points defining the window coordinates. If necessary, multiple windows can be created by holding down the Shift key.

  2. When you have finished defining the Working Area, the Geometry Cleanup check will be performed. A message dialog will display the results of the check (i.e. the number of vertices which were merged).