Minimal value in keyword TSTEP

[Ruslan1541]

Hello!

I want to know, if it is possible to set a value in TSTEP below than 1 second?
Because after several tests, I estimated that all steps below this limit are skipped unil the simulation reaches to 1 second (below is an example).

Input file (there is a lab unit (hours)):

simulation:

[blattms]

Please also consult the reference manual.

It is a bit unclear to me, what you want to achieve. The output that you are showing indicates that OPM-flow is having convergence issues. What it does in this case is to decrease the time step and retry. Often smaller time steps make the system easier to solve. If this approach does not lead to successful convergence, then we eventually give up and abort the simulation. It might be a coincidence that this happens for 1 second time steps in your case.

Giving up because of excessive time stepping might be a sign that your model is not physically sound / well posed. It also can be a bug on our side, of course. It might be good to take a look at the warnings that the simulator is printing.

TSTEP tells the simulator when it should output report steps. This also means that it implicitly sets a maximum step size to be used. You may use small values for this. Just be aware that the simulator will create output for each of theses steps and hence this might consume a lot of space. Maybe that is not what you want?

If you know that the simulation will need to use small time steps, then I would prefer the keywords NEXTSTEP together with DATES.