DHIJWASv Software FEFLOW 6.1

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have to be selected first. Activate Select Nodes in
the Selection toolbar and draw again a rectangle
around the line feature. Click on the Smooth Mesh
tool that is now active and clear the selection with a
click on Clear Selection. Figure 6.11 shows the
selected mesh location before and after the smoothing.
Figure 6.11 Mesh before and after smoothing.
To check for obtuse angles and triangles violating
the Delaunay criterion, we use the tools provided in
Auxiliary Data in the Data panel. First, doubleclick
on Max. interior angle of triangles to show
obtuse-angled triangles in the active view. Pay attention
to how the angle distribution changes when we
click on Undo in the Standard toolbar to
return to the unsmoothed mesh. Next, double-click on
Delaunay criterion violations and then click on
Redo in the Standard toolbar to return to the
smoothed mesh again. Both distributions indicate that
the mesh smoothing has significantly improved the
mesh quality.
Use the Move Node tool in the Mesh-
Geometry toolbar and drag a mesh node to change its
position within the mesh. Also, use Flip Edge and
click on an element edge to change the subdivision of
two adjacent triangles. Edge flipping will freeze the
mesh so that derefinement of previously refined areas
will no longer be possible.
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Click on Open to load the file quadmesh.fem
for this exercise.
Except for the derefinement and the flip edge tool
all editing options are also available for quad meshes.
As an additional option, quad meshes can be transformed
into triangular meshes. Four different triangularization
methods are available of which we will use
one. Select the method Four Triangles around
Center from the dropdown list in the Mesh-
Geometry toolbar to subdivide every quad element into
four triangular elements. The resulting finite-element
mesh is shown in figure 6.12.
Figure 6.12 Refined quadmesh.