Initialization of systems with dynamic state selection is not handled properly

[casella]

Lennart Ochel wrote me:

There is no approach in OpenModelica to select properly the initial states for the state sets yet [for the initialization of dynamic state selection]. Right now we choose the states randomly that are used for the initialization phase.

This should be fixed for the 2.0.0 release.

[casella]

In the meantime while a proper solution is found for this issue, in case of failure couldn't we just re-try with some other random choice for a certain number of attempts? That would already be much better than an one-shot try

[casella]

Karim has some ideas, will discuss them with Willi and Bernhard

[casella]

@Karim, could you post a comment here with an update on the status of this issue?

Thanks!

[Karim.Abdelhak]

An alpha version for better initialization of models with dynamic state selection is available via the flag "--initialStateSelection", currently only working for C. Is there a model for which it can be tested?

[casella]

The attached models are textbook examples - when the point mass is close to the x-axis, one should use y and vy as states, while x and vx should be used when close to the y-axis.

It seems that the current runtime can already select the right initial state in both cases, of course I couldn't easily find a case that fails (Murphy's law).

[casella]

See also #5574