Convergence not reached

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi everybody,

I am simulating a motor in Flux 2D, importing a geometry from Motor-CAD. I did everything correctly, included meshing and assigning the physics, but when I run the simulation the solver doesn't find any convergence at step 3 (see the attached images to view the error message). What can I do to solve the problem? Thanks in advance.

<?xml version="1.0" encoding="UTF-8"?>Convergence problem.PNG

<?xml version="1.0" encoding="UTF-8"?>Error message.PNG

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Answers

  • asoualmi
    asoualmi
    Altair Employee
    edited February 2018

    Hi,

    Try to change the method of solving. To do it:

    In solving option >> nonlinear system solver >> method for computing the relaxation factor for Newton-Raphson: put Fujiwara method instead of automatically specified method.

     

    Best regards.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    Did this method work by replacing automatically to Fujiwara?  because i m also facing same problem 

  • Otto
    Otto Altair Community Member
    edited July 2020

    Hi!

     

    I am having convergence problem in nonlinear solving process with induction machine short-circuit simulation. Earlier I used to change solver to Fujiwara in this kind of situation but nowadays there are only few solvers left in version 2019.1.1 and the ones there are, do not help me. I think it is very negative update that the solver options (e.g. Fujiwara) have been removed. Can you give me any advice for solving this problem?

     

    Best Regards

  • Yann_Le_Floch
    Yann_Le_Floch
    Altair Employee
    edited July 2020

    Hi Otto,

    Fujiwara is in the 2019.1.1 version.

    We just change the number of option in standard mode, but you can access if you use the advance mode in the option on the supervisor

    image.png

    Yann

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