Fluids

Fluids

What the different between the symmetry boundary and periodical boundary

    • Jimmyhan
      Subscriber

      Hi, I am Jimmy. there is a problem in my simulation, When I used solver there is a warring stop my simulation. it told me something wrong in symmetry boundary setting. So I followed the suggestion to check the reason. But till now I can not find it out. So I try to use another way. I change the cross-section setting to a periodical boundary. It is work! I would like to know this interesting thing. 1. What the difference between the symmetry boundary and periodical boundary? 2. What kind of situation the symmetry boundary (or periodical boundary) have to be used? 3. How can I  understand the symmetry and periodical boundary warning and the suggestion clear?Maybe you can give me some advice directly on my problem. Thank you!

    • Min Zhang
      Subscriber

      The two figures listed below may help.



       


    • Jimmyhan
      Subscriber

      Your reply was such great and clear. But can you give me some advice, Why I change symmetry boundary to periodical boundary the solver was no warning? Symmetry boundary recognize there no plane or axial, but periodical boundary was ok. is there some limitation in boundary setting?Thank you so much.

    • Min Zhang
      Subscriber

      Sorry, I do not know your geometry. Maybe you can refer to the information on this website:


      https://www.cfd-online.com/Forums/cfx/65276-symmetry-boundary-conditions-cfx-3.html

    • Jimmyhan
      Subscriber

      Thank you, Your suggestion really helps!

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