Meshing ErrorSurface Meshing Failure; Volume Meshing Failure

Issue:

The startup process stops during the meshing stage and one or more of the following errors are issued:

Meshing Error: Surface meshing failure for surface A along edge B near X Y Z (Code 1101)

Meshing Error: Intersecting surface meshes identified for surface A and surface B (or adjacent surface) near X Y X (Code 1102)

Meshing Error: Model problems and/or surface mesh setting too coarse for surface A near X Y Z (Code 1103)
(A is the surface ID; X, Y, and Z are the coordinates of the problem)

Meshing Error: Volume meshing failure for volume A near X Y Z (Code 1200)

Meshing Error: Model problems and/or volume mesh setting too coarse for volume A near X Y Z (Code 1201)
(A is the volume ID; X, Y, and Z are the coordinates of the problem)

Meshing Error: Quality check failure encountered

Meshing Error: An improperly formed element was detected at the highlighted point. Check <mesh log file> for the coordinates of this location

During the generation of the mesh, a problem either in the geometry or the mesh definition prevented the mesh from successfully generating. There are several things that can cause this error to be issued.

 

Solution:

Solution

1. Find the problem location.

After the failure, an orange dot is drawn on the model at the coordinates listed in the error message. This is the location at which the meshing process stopped. The model is shown as transparent and the offending volume is selected to help you find the problem location:

  • The orange dot may be difficult to see, so turn off the mesh seed points to improve visibility. (From the menus at the top of the User Interface, click Window, and uncheck Show Mesh Seeds.)
  • Click the View as Outline icon to turn off all shading. This can really help you to see inside the model.
  • Since the problematic volume is selected, note the ID for future reference. Adding it to a group (right click, and select Group > Create group) is a convenient way to quickly access the part later.

Surface and Edge Diagnostics are also very helpful for finding the problem:

  • On the Meshing dialog, click the Diagnostics button.
  • Move the slider to identify small entities that may be problematic.

2. Inspect and repair the geometry in the vicinity of the problem location.

Some things to look for include:

  • Surfaces that overlap or are on top of one another
  • Tiny gaps between surfaces or volumes
  • Sliver surfaces
  • Tiny volumes resulting from volumes that overlap
  • Edges that are shared by more than two surfaces 

The Geometry Tools (Edge Merging and Small Object Removal) can fix many of these problems. (Right click on the Geometry branch of the Design Study bar.) If these tools are unable to resolve the problem, return to CAD system to fix the geometry.

3. Refine the mesh locally

If the problem is on an edge or surface, try refining the mesh distribution locally. This is more efficient than refining an entire volume, and will prevent the mesh count from getting as big. Do this by:

  1. Open the Mesh Sizes dialog. (Right click off the model and click Edit…)
  2. Change the selection mode to either Surface or Edge. (Right click off the model, mouse over Selection type, and select the desired mode).
  3. Select the surfaces or edges in the model that will be refined.
  4. Move the Size adjustment slider toward Fine (between 0.75 and 0.9 is a good place to start)
  5. Click the Apply button in the Size adjustment group.
  6. Repeat as needed with other entities.
  7. Click Spread Changes when you are finished with your adjustments.

4. Refine the mesh on the volume.

The procedure is the same as in step 3, except set the selection mode to Volume.

5. Adjust Mesh Enhancement

The problem might be due to overlapping Mesh Enhancement layers. On the Meshing dialog, click the Enhancement button, and reduce the Layer Factor to 0.3.

Products:

Simulation CFD

Versions:

2010;2011;2012;2013;2014

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