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  • Documentation

    Error: Mesh Too Coarse


    The mesh could not be generated as the mesh sizing is too coarse to resolve the model. You can inspect your model for undesired tiny features at the reported position at the end of the Meshing log or increase the fineness of your mesh.

    What Happened?

    The meshing process failed because the size is too coarse to mesh the model.

    What Could Be the Possible Reason?

    The mesh is too coarse to resolve the geometry. As a result, small elements of the model did not mesh properly, causing the meshing operation to fail.

    What Can I Do Now?

    Possible solutions to resolve this error are:

    • Check where the meshing operation failed: The algorithm reports the problematic entities in the Event log and at the end of the Meshing log. This will provide you valuable insight for the subsequent CAD clean up.
    mesh too coarse error event log
    Figure 1: Event log showing on which entity the meshing operation failed. You can click on the entity to select it.
    • Check your CAD model for other undesired small features: Simulations do not need all of the elements of the model but rather a simplified, clean version. The best practice is to omit or simplify the unnecessary parts, which won’t heavily influence the results. A guide on how you can prepare your model for simulations can be found here.
    Figure 2: Cleaning up a CAD model. The geometry to the right will possibly result in a higher quality mesh.
    • Refine your mesh: This will make the mesh finer and makes it easier to mesh smaller elements/intricate features in the model.
    mesh settings to show how the user can refine the mesh
    Figure 3: Changing the global level of refinement of a mesh.

    You can change the fineness of your mesh in the Mesh settings by manipulating the Fineness slide bar. It is better to increase the mesh gradually so that there is a balance between the quality of the mesh and the computational resources used.

    Alternatively, it’s also possible to apply local refinements to the problematic entities. This can be done, for example, by manipulating the local element size or applying region refinements. Read more about how to get good mesh quality here.

    • Decrease small feature suppression: Small feature suppression as the name suggests, suppresses small features in your model, therefore decreasing this value will allow the mesher to resolve the short edges or small faces in the CAD model. You can do this by going to the Advanced settings in the Mesh and decrease the value under Small feature suppression.
    steps to allow for short edges or small faces to be resolved
    Figure 4: Decrease Small feature suppression to allow for small features to be meshed

    Important Information

    If none of the above suggestions solved your problem, then please post the issue on our forum or contact us.


    Last updated: October 9th, 2020