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modelicadymola

How to ensure convergence during the initialization of the nonlinear system in Dymola

Is there a guide for increasing the ability of convergence during the initialization of the nonlinear system in Dymola? Usually, the connector contains start values, but they are not always suited for the model I build, so there might be a divergence issue during the initialization. How could I avoid this issue?

Solution

  • The Dymola User Manual Volume 1 has several chapters, which deal with the initialization of nonlinear systems. In Dymola 2020 the chapters are:

    5.6.8 Initial guesses for nonlinear equations in the model during simulation
    5.8.3 Discriminating start values
    5.8.4 Debugging failed initialization

    You can also try to provide min and max values for certain variables and activate the check during simulation, as described in

    5.6.10 Bound checking for variables