Issues in non-linear implicit run

gopal_rathore
gopal_rathore Altair Community Member
edited October 2020 in Community Q&A

Hi @George P Johnson

I am getting convergence issues and also unrealistic force values for a non-linear implicit run. The same runs properly in explicit solver and the objective is compare the results.

I have sent the file through secure link.

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Gopal,

    The run is stopping due to Istop=-2 error.

    When the time step is smaller than the input minimum one (see /IMPL/DT/STOP), RADIOSS will stop the run with this message. Please go through the Help Menu on this which gives general workarounds possible.

    As a note, implicit solution is RADIOSS is more to complement the Explicit Solution.  So we suggest to use it only for specific cases like Spring Back.  For other generic Implicit Non-linear cases, it is always recommended to use OptiStruct.

Categories