Share topology or not in drop test simulation

- October 29, 2019 at 9:08 pm
  
  pengchengyin
  Subscriber
  
  Hi all,
  
  Recently, I modeling the rack server in order to do the drop test simulation by using Ansys ls-dyna. But I am very confusing about share topology. And I searched the information on the website, they shows their model was not share topology. But in my experience, the model always need share topology in Ansys APDL which means the model has conformal mesh. Therefore, could anybody tell me why we need to share topology? and what if I don't share topology and use bonded instead of share topology, the result is still ok or not? if I can't, what's the different between share topology and bonded? I attach the image of my model and the image from website which didn't share topology.
  
  Thank you!
- October 31, 2019 at 12:33 am
  
  Sandeep Medikonda
  Ansys Employee
  
  Irrespective of the solver used, my suggestion would be to use Shared topology whenever possible. See this discussion. There are many more such discussions on the community that you can search for.
  
  Now, if you are trying to model failure between the parts of course shared topology wouldn't work.
  
  If you are not using Shared Topology, By default, your WB LS-DYNA analysis should put a Body Interaction object (also called an Automatic Single Surface contact) which should automatically account for the contacts between all bodies.