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ANSYS RBE3 command vs Contact Wizard

  1. Jan 27, 2010 #1
    Hello all,

    Just thought I would throw this one out there.

    Who preferes to use the RBE3 command to automatically create a set of constraint equations and who prefers to use the Contact Wizard?

    I used to use the Contact Wizard but I recently got burned by it, so I switched to using the RBE3 command, which isn't the most pleasant command either but hey it's ANSYS.

    Any thoughts would be appreciated.

    Thanks
    Mattt
     
  2. jcsd
  3. Jan 28, 2010 #2

    minger

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    Science Advisor

    I've personally never used RBE3s. I've either used MPC connections or CE/CPs. Do RBE3s have an advantage being nodal over MPCs (surface based)?
     
  4. Jan 29, 2010 #3
    I am not sure is there is an actual advantage. I do know that using constraint equations with a large number of nodes can cause some inefficiency in the solution time.

    In version 12.1 you have to use a parameter array for the slave nodes. A component will not work.

    Thanks
    Matt
     
  5. Jan 29, 2010 #4

    minger

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    Science Advisor

    I see that RBE3s are force-distributed rather than directly "coupled". This could things like applying moments probably more accurate. The thing about the parameter array is kinda dumb though. Why?
     
  6. Jan 29, 2010 #5
    I am not sure. I had to call tech support because I didn't know you had to use a parameter array either. You can use components for every other command. I made a short text file that can be used for the job. It is a modification of the one that the tech support group sent me.

    Let me know if you want it.

    Thanks
    Matt
     
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