OpenFOAM-CalculiX FSI unable to converge

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1

Hi everyone！

I am a newbie using preCICE. I am trying to implement a simple 2D wing simulation by changing the perpendicular-flap case in the tutorial, referring to the OpenFOAM tutorial Turbulent flow over NACA0012 airfoil (2D) and assume that the Solid-part front-end is fixed for the FSI simulation.

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The results do not to be converging

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---[precice] ERROR:  Attempting to add a zero vector to the quasi-Newton V matrix. This means that the residuals in two consecutive iterations are identical. If a relative convergence limit was selected, consider increasing the convergence threshold.

Do I have any missing or improper settings?

I have attached the file I set up here Cases

I am stuck and any help would be really appreciated

Best regards,

Jeff

P.S. I am running preCICE version 2.5.0

2

Does this happen in the first coupling time window, or later on?

3

It happens in the first time window

4

There are currently some related known issues with zero coupling data in the first time window:

They are both currently scheduled for preCICE v3.0.0 (but this is no guarantee).

In any case, as a general rule-of-thumb for FSI simulations, it is helpful to start from a precomputed flow field (i.e., a few seconds simulated without coupling). Unless, of course, the zero initial conditions are particularly important for your application.