Hi,

By default OpenModelica uses the dassl solver which has a variable step size.
The stepSize for the solver is calculated as (stopTime-startTime)/numberOfIntervals.
However, the stepSize only gives the time where the solver should output values and is not the actual step size of the solver.
By default (if you don't give anything to the simulate command):
stopTime = 1.0
startTime = 0.0
numberOfIntervals = 500

You can also select as method="euler" when you call the simulate command.
In that case I think the step size is fixed.

You can send an email to Willi Braun [willi <dot> braun <at> fh-bielefeld <dot> de]
and ask how he  implemented events in the Euler solver (and maybe post back
here with the answer).
Another way would be to look into the code how is done:
https://openmodelica.org/svn/OpenModeli … _euler.cpp
user: anonymous
pass: none  <- write none here

Cheers,
Adrian Pop/

Thank you Adrian for answering.

I taked a look on to the Euler solver implemented in OpenModelica and it calls zero crossing functions. It outputs reults at fixed steps but iterations are done in the fixed step too.

Best Regards,
Jawhar