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AutoPIPE Wiki Q. Confirm - The load case did not converge. Do you wish to continue iterating? ... message in AutoPIPE
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            • -Q. Confirm - The load case did not converge. Do you wish to continue iterating? ... message in AutoPIPE
              • +01. What to do when "load case did not converge" message appears in AutoPIPE?
              • 02. How to read a *.LOG file in AutoPIPE?
              • 03. Does AutoPIPE as a whole have the same type of converging issues as seen by other programs?
              • 04. How to change number of iterations for non-linear static analysis?
              • 06. How to solve a friction force problem found in a Log file for AutoPIPE?
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    Q. Confirm - The load case did not converge. Do you wish to continue iterating? ... message in AutoPIPE

    Applies To
    Product(s): AutoPIPE,
    Version(s): All
    Area: Confirm Message
    Original Author: Bentley Technical Support Group

    Problem:

    When analyzing a model the following occurs:

    ---------------------------
    Confirm
    ---------------------------
    The load case did not converge. Do you wish to continue iterating?
    ---------------------------
    Yes   No   Cancel  
    ---------------------------

    What should I do?

    Solution:

    Selecting  YES: The program will re-run the analysis for more iterations in hopes of converging below the non-linear tolerances specified.

    The default number of iterations is 30, If it was determine that 31-99 iterations enabled the analysis to converge, make this a permanent change by changing the Nonlinear analysis> Maximum iterations settings, as shown below 

    Then each time an analysis is performed it will use the updated number of iteration thus reducing likely hood that the message above will be displayed. 

    Selecting No: Stops the analysis procedures and presents the following:


    ---------------------------
    Confirm
    ---------------------------
    Do you want to see .LOG file for magnitude of unbalance error?
    ---------------------------
    Yes   No   Cancel  
    ---------------------------

    Selecting Yes: AutoPIPE Viewer is automatically displayed with the *.LOG for review.

    Selecting No: The dialog is closed and user is able to enter the next AutoPIPE command.

    Selecting Cancel: The dialog is closed and user is able to enter the next AutoPIPE command.

    Additional Comments, Questions, and Answers:

    Notes:

        • Some more converging solutions for buried piping are to first try using nonzero K2 values in order to avoid unlimited displacements. Using larger K2 values temporarily (K2=K1/1000 or so) can help you see if P1 values are sufficient by checking displacements. By setting K1, K2, P1 to 0.01 N/m and 0.001 M/mm/mm, the model should converge with no problem

        • May need to add concentrated or distributed weight to submerged pipe to prevent it from uplifting (in practice concrete mats are added in some cases

        • Try using V-Stops at a reasonable spacing (that will make it pass the sustained stress check). You may have to use large friction factors (0.5 to 1.0) for these supports

        • Under certain circumstances, when 2 analysis set should be the same but are different may be directly related to different number of iterations and tolerance settings that are too wide. Tightening up the tolerance may help the results become more consistent,  

    Item #1: What to do when "load case did not converge" message appears in AutoPIPE?

    a: Model with gaps and friction does not converge after 5 iteration, should it continue to iterate or not?

    b: Piping model with Wave does not converge

    c: Piping model with beams and soil does not converge

    d: Piping model with underwater piping resting on the seabed does not converge

    Item #2: How to read a *.LOG file in AutoPIPE?

    a: How to solve a friction force problem found in a Log file for AutoPIPE?

    Item #3: Does AutoPIPE as a whole have the same type of converging issues as seen by other programs?

    Item #4: How to change number of iterations for static analysis?

    See Also

    Confirm Messages displayed in AutoPIPE

    Bentley AutoPIPE  

    • AutoPIPE
    • converge
    • Confirm
    • warning
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    • Cancel
    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Sep 23 2013 1:42 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Tue, Sep 13 2022 1:43 AM
    • Revisions: 37
    • Comments: 0
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