Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Difference between contact pair and identity boundary pair
Posted Nov 21, 2013, 4:42 a.m. EST Structural Mechanics Version 4.3b 0 Replies
Please login with a confirmed email address before reporting spam
I am new to Comsol and I was building my model, a cylinder inserted into a closed end sleeve. Load is applied on the top surface of the inner cylinder (like a piston-cylinder configuration). They are two separate objects, so I used 'Form Assembly in Model 1'.
The issue I am confused about is when you define whether it is a contact pair or a identity boundary pair. There are two surfaces on the cylinder contact with the sleeve: bottom surface of cylinder with closed end surface of sleeve, peripheral surface of cylinder with inner surface of the sleeve.
If I am not mistaken, a corresponding boundary condition need to be defined on both contacting surfaces, in 'pair'. There are several options in 'pair': 'contact', 'boundary load', 'fixed constraint', 'free' etc. If I use 'boundary load', it is working, however, when I use 'contact', error appears (results not converge).
Please check the attachment for my model.
I will be glad if someone can help me with this.
Jing
Attachments:
Hello Jinghua Tang
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.