About internal state when using implicit coupling

Using preCICE
1

HI:
when I read the precice literature named “Efficient and Flexible Partitioned Simulation of Fluid-Structure Interactions” , in section 2.3.2, I can’t understand the words follow:

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I think it’s very important to understand implicit, so who can help me interpretate it?(i think give a example is the best!)

2

You are reading Bernhard Gatzhammer’s dissertation from 2014. You might find more related resources in our literature guide:

However, the first place I would look at would be the current and official documentation:

Put simply, implicit coupling means that there is an “external loop”: solvers don’t only exchange information once (explicit coupling), but repeatedly, until the information on their interface converges.

3

yes, but for “the two possibilities how the internal state is teated” ,This statement shows that there is a clear difference between these two approaches to implicit coupling, but what is the difference?

4

Ah, I see now what you are asking. This pretty much describes the following:

  • Option A: I can control when to “advance” the solver state to the next time step. If preCICE tells me that the coupling is complete, then I advance the solver state to the next time step.
  • Option B (more common): I cannot control how the solver advances in time. For this reason, I keep checkpoints, and I force the solver to go back in time and repeat the computation of some time steps.
5

ok，very clear，thanks!

6

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