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Guest Chris Nielsen

Consecutive node and element numbering

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Guest Chris Nielsen

When generating a mesh in SMS, I notice that the element and node numbers aren't always consecutive. This is especially the case if I am editing an existing mesh, or delete specific sections, etc.

 

Does this have any consequence on running TUFLOW FV?

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Guest Chris Nielsen

TUFLOW FV requires that there is consecutive numbering for nodes and elements in the input mesh file (the *.2dm file). In other words, if you have 100 nodes in your mesh then the highest node ID will be 100.

 

SMS allows you to have gaps in the ID lists of both nodes and elements, and this situation often occurs when you are adding or removing elements, etc during the mesh design process.

 

As a final step in the mesh generation process it is recommended that you renumber the mesh. To do this in SMS, follow the steps:

  1. Select a nodestring (any will do, however a boundary nodestring is preferred).
  2. Click on the menu command “Nodestrings -> Renumber” (or right click, and press “renumber”).

This will renumber all the elements and nodes. Note that all TUFLOW FV inputs are input via x/y coordinates or nodestring IDs, so renumbering should not influence your model runs (although it may be pertinent to check this, especially if you have identified a particular element or node ID to extract results).

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