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Delete Unused MPC, Nodes, elements

ron.kunz
WIth utility "FEM-NOdes - REmove Unused nodes" it is possible to delete unused nodes.
When I select this option, I get this message:
"210 FEM entities do not exist or are still associated and cannot be deleted."
How can I delete these nodes now? I think the reason is due to deleted MPC`s in the model. Still there exists some association to old MPC`s, how can I delete unused MPC?
 
  • 0
    First check:
     
     
    There is a message like:
     
    "$# 20 FEM entities do not exist or are still associated and cannot be deleted: Node 1:4,7:10,15,16,21,22,28,29,34,35,37:40"
     
    Copy string "Node 1:4,7:10,15,16,21,22,28,29,34,35,37:40" and create a group with these nodes.
     
    Hide all other groups
     
    Extend Group with Utilities - Group - Group extend
     
    -> You should see the MPCs attached to these nodes
  • 0
    Thanks karIR
    I see not only MPC are associated but also elements for which I deleted the group.
    So they should not be in the model any more.
    In Hypermesh the option exist: find by attached.
    So what I want is to make a new group for which all nodes are connected. And a group which are loose. Is this possible?
  • 0
    You can use Utilities/Group/Groups from Connected Elements. Alternatively, use Utilities/Group/Group Extend and set the "Max Number of Loops" to 0 - this will continue adding connected entities to the group until it finds all connected entities.
     
    When you deleted the group, did you make sure to switch on the option to "Delete Associated Members"? Otherwise you've only deleted the group definition, but not the nodes and elements in it.
     
  • 0
    Thanks Darrel,
    Indeed that seems to be the case that I did not select that button, however it is strange that parts which are not visible if you unselect all groups and you select a box to delete all remaining parts no parts (elements, Mpc etc) are selected so I would assume nothing is in the model, but the model crashes on nodes which are not my groups.
     
  • 0
    Entities have to belong to at least one group in order to be displayed. If they're not visible, they can't be picked. If you deleted a group but not its contents, then those entities became orphans (assuming they weren't also included in another group). You can collect together orphan entities by creating a new group and using the option "Add All Orphans"
    ScreenShot2151
  • 0
    Hello Darrel,
    Here you stated: "You can use Utilities/Group/Groups from Connected Elements. Alternatively, use Utilities/Group/Group Extend and set the "Max Number of Loops" to 0 - this will continue adding connected entities to the group until it finds all connected entities."
     
    Is there also a way if you select one element to add all connected elements to that selection? So not using geometry just by selecting 1 element and state something like find attached elements?
    (Maybe it should be in a new question).
     
    Thanks in advance.
     
     
  • 0
    Hi Ron, do you mean that you want to find only the elements immediately surrounding your target element, or do you want find (e.g.) all elements in a component after picking one element?
     
    Either one could be done by putting the element in its own group and using the Group Extend Utility - with max loops set to 1 or 0 as appropriate.
     
    There is an alternative method for the first option, but it's a little long-winded. Go to Tools/List/Create. First create a list of nodes by association with your target element. Then create a second list of element associated to those nodes. See images below. Note the use of the syntax `lista` to indicate the contents of the he first list. The final selection can be used elsewhere by referring to `listb`.
     
    ScreenShot2514
    ScreenShot2515
    Does that answer your question?
  • 0
    In Utilities/General/Active Set is an option "Attached". Try this if your model is not too large.
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