[Pfiffikus]

Since we control the time step size ourselves, we need to

1. get the former state, i.e. last time state,
2. reset the time step size

before we continue in the time loop.

What is the current and most efficient way to do that? What is the difference between storeOldTime and storePrevIter?
What happens implicitly in Time class? What has to be enforced explicitly?

[massive_turbulence]

Originally Posted by Pfiffikus

Since we control the time step size ourselves, we need to

1. get the former state, i.e. last time state,
2. reset the time step size

before we continue in the time loop.

What is the current and most efficient way to do that? What is the difference between storeOldTime and storePrevIter?
What happens implicitly in Time class? What has to be enforced explicitly?

In theory you output files when you run and those states for each variable store whatever the last time step accomplished so basically my idea is to set the controlDict to the last time step and run it from there. Either that or I misunderstood your question completely.

[Pfiffikus]

Originally Posted by massive_turbulence

... to set the controlDict to the last time step and run it from there.

Since my question is located in the sub-forum Programming & Development we don't want to interrupt the simulation, but modify the time-stepping on the fly.

We are somehow confused by the referenced, but contradicting(?) posts ...

[massive_turbulence]

Originally Posted by Pfiffikus

Since my question is located in the sub-forum Programming & Development we don't want to interrupt the simulation, but modify the time-stepping on the fly.

We are somehow confused by the referenced, but contradicting(?) posts ...

The controlDict file is referenced initially and the variable for the time-step must be stored somewhere. Is that the variable you're asking about?

Nevermind, haven't had my coffee yet, went to the links you provided. Seems like someone already tried that method.

[Pfiffikus]

Originally Posted by massive_turbulence

Is that the variable you're asking about?

Yes, on the one hand, but on the other hand we like to understand the mechanism of storing old states.
Our main focus is to undo last time step, i.e. set all values to recent state.