Convergence problems in a transient simulation

Efrain
Efrain Altair Community Member
edited January 2023 in Community Q&A

Hello

I am making a transient simulation of a current transformer, but I have convergence issues. Convergence issues occur when the magnetic material of the core is saturated, can you help me the to solve the convergence issues? I am attaching the flux model. Thanks in advance for the support.

Efrain

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Answers

  • Lavanya Vadamodala_20519
    Lavanya Vadamodala_20519
    Altair Employee
    edited January 2023

    Hello Efrain,

    This type of convergence issue occurs when the non-linear algorithm does not converge within the maximum number of iterations.

    With the spline saturation data, when the H values exceed the values in the given table, then Flux tries to extrapolate and find the corresponding B value. With this extrapolation, sometimes the solution does not converge.

    Including more points in the BH curve at saturation can help converge the solution.

    As an initial solution, I suggest you try with material such as "Isotropic analytic saturation + knee adjustment (arctg, 2 coef.)". Here the values are extracted from the data in "Isotropic spline saturation".

    image

    Other solution is to try different solver options and get the solver which converges. 

    Thank you,

    Lavanya

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