General Mechanical

General Mechanical

Update CAD geometry corrupts most boundary conditions

    • AhmedDesoki
      Subscriber
      Dear folksnI have CAD geometry made by NX. I Import this geometry to Ansys static structural. This way, if I changed the CAD geometry in NX, from Ansys Mechanical, I can update the geometry to reflect the new changes. This is fine.nBut, in Ansys, I set boundary conditions to the CAD geometry. This includes loads, supports, contacts between parts, ... The problem is that most of these boundary conditions incorrectly change after the geometry update!!!nThis is a very serious problem to me. I have a model with many parts. Defining the boundary conditions takes a lot of time. Then, based on analysis results, I may decide to make a minor change to one CAD part. Then after updating the geometry within Ansys, I discover that most of the boundary conditions incorrectly changed, and I have to spend a considerable time revising them all before making a new analysis run!! Many times, it is even faster, and less error prone, to redefine all the boundary conditions from scratch, than revising and modifying all of them one by one!nIs there any solution to this problem?n
    • Govindan Nagappan
      Ansys Employee
      ArraynYou can use this solution for future projects, not existing model:nIn WB project schematic, right click on Geometry cell and select Properties. In details of properties, set "compare parts on update" to associatively. Then import the model into Mechanical and define your loads/BC/Mesh scoping. Now, if you go back and change the geometry in CAD and update it in Mechanical , scoping should be maintained for bodies that are not modifiednYou can make this setting as default, by going to WB project schematic -> Tools -> Options -> Geometry Import. set "compare parts on update" to associatively and then click OK. Next time you launch WB and create new project, this setting will be used. This will not change existing projectsn=================================nYour current model probably does not have this setting turned on. So associativity is NOT maintainednConsider using Model assembly for current model. This way you can send the mesh, contacts, joints, remote points etc from current system to a new analysis system (This will NOT include loads/BC's). In a separate Mechanical Model system, you can import and mesh the modified geometry and send the mesh the new analysis system. Your new analysis system will be the assembly, where you have to define loads/bcs. nExample schematicnn
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