Correcting surfaces

• With the View->Zoom->In option in the menu or Zoom->In on the mouse menu, magnify the zone around surface 124.
• Set visible the labels of the lines and points on this part, with View->Label->Select on and selecting the lines and points of interest

• Several line segments are superimposed over each other, thus creating an incorrect surface boundary.

• To destroy repeated entities a local collapse may be executed. Select Geometry->Edit->Collapse->Lines. Then select the lines that appear in red and labeled in the previous image and press ESC.

• Now the four overlapped lines become only two. The point 1191 join two curves (14 and 133) that are aligned, it is possible to join them in a single curve, to avoid short curves and to facilitate future selections having less entities. We can do it only for these curves, but we will do it for all lines

Geometry->Edit->Join->Lines
and select all in screen (or write 1:end in the command line) and press ESC

only will be joined the lines that are 'near tangents with a tolerance'

• The surface boundary 124 is wrong, because has repeated the line 18.

We can confirm it listing its data with Utilities->List->Surfaces

A possible solution is to replace this surface by a new surface with the same underlying shape and a new trimming boundary (lines 57, 159 and 3460).

• Select Geometry->Create->NURBS surface->Trimmed. Select surface 124. Then select the lines in red to define its boundary. Press ESC twice.

Now we have two overlapped surfaces, the old one num 124 must be deleted.

1. Select Geometry->Delete->Surfaces. Select surface 124 and press ESC.
2. Do the same with the surface 149 (create a new trimmed surface with the appropriated boundary and after delete the bad one)
3. Mesh the geometry again with Mesh->Generate Mesh.
4. A window comes up in which to enter the maximum element size for the mesh to be generated. Leave the default value provided by GiD and click OK.

The mesh generating process may be carried out with no further errors found.

• The imported piece is now completely meshed.