General Mechanical

General Mechanical

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Shared topology not behaving as expected

    • Clarkt
      Subscriber

      Greetings,

      I am modelling a 2D gear meshing process. In order to get uniform mesh for all the teeth, I created the geometry for a single tooth and then copied it using circular pattern in Spaceclaim. Each gear is now consisted of as many identical 2D surfaces as its number of teeth. The common edges between the 2D surfaces have shared topology, which is also displayed in Mechanical (see picture below). The mesh also seems to respect the share topology constraint. 

      However, when running the simulation, the teeth seem to be separating from each other (see picture below). Of course, this is absurd and should not had happened since shared topology is active. 

      Any ideas on how to tackle this?

      Thank you in advance!

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

    • Erik Kostson
      Ansys Employee

      Hi

      See if the mesh is really connected (might look so, but we need to check as shown below - first post in that link):

      https://discuss.ansys.com/discussion/2651/check-for-mesh-connectivity-between-two-bodies

      All the best

      Erik


    • Clarkt
      Subscriber

      Hi Erik, indeed the mesh connectivity is not as it should be: 

      Is there an example on how to deal with this?

      Thanks

    • Erik Kostson
      Ansys Employee

      Hi

      It is only the 3 lower teeth on the top gear that are not.

      One can look at node merge or mesh connections:

      https://www.youtube.com/watch?v=m7UVzKSXjWM

      Or even better just create one part out all of the teeth instead.

      All the best

      Erik

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