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Fluids

Fluids

Topics related to Fluent, CFX, Turbogrid and more.

Periodic Boundary Conditions in Fluent Meshing Error

    • Dio
      Subscriber

      Hi,

      I am doing simple smooth pipe to get Nusselt number.

      Defined periodic BC at fluent meshing side, and added 1e-3 uniform inflation.

      When I switch to fluent, defined periodic bc and it worked. result was higher than dittus-boelter corelation

      Then wantted to decrease inflation first layer to 3.1e-6 using y+ calculator.

      But that time in fluent side periodic bc does not work and got below error.

      What can be the reason?

       

      Thank you,

    • Dio
      Subscriber

      I tried 2D case and got similar error.

       

      Thank you

    • Rob
      Forum Moderator

      That looks OK. You can always create a nonconformal periodic, that generally avoids problems. 

      I assume you checked the periodic energy equation fudge and how Fluent calculates Nu?

    • Dio
      Subscriber

       

      Hi,

      Thank you Rob. Now trying it but why I could not see faces? Just did mesh using fluent meshing, also defined periodic faces in fluent meshing.

       

      Thank you

       

    • Rob
      Forum Moderator

      Define as "interface" & "interface_1" or "fred" & "ginger" but with the type as interface. 

    • Dio
      Subscriber

      Just got an error. (Yes I defined values in reference values to calculate Nu ✔️)

      Here is how I did.

      1-Changed it to interface

      2-Defined like this.

      Then defined boundary conditions, mass flow rate and heat flux and started analysis. Then got floating error.

      What am I missing?

       

       

       

    • Rob
      Forum Moderator

      Nice to see the classic boundary name pairing. :)  

      It's running so the basics are OK. If you review the flowfield at around 20 iterations what is going on? 

    • Dio
      Subscriber

      Yea, that is new info for me :) 

      I just changed solution method from SIMPLEC to COUPLE  and it worked. No error.

      It looks some error and I will play with mesh, and turbulence method now.

       

      Thank you

    • Rob
      Forum Moderator

      Check things like area values in Fluent alongside what the experimental values & errors are.  I won't say the experiment is wrong, nor the CFD, but don't assume either is "correct" either. 

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