Dear preCICE community, I have successfully coupled our in-house finite-volume CFD solver with preCICE. Last week, I migrated our adapter from preCICE 2.X to preCICE 3.X. Thanks to the clear documentation on the website, the transition was smooth and quick. I am currently running the FSI3 test cas…

Hi Guillaume, That’s a good summary. For constant underrelaxation, parallel-implicit coupling brings no benefits as you need twice as many iterations as for serial-implicit coupling. Only for quasi-Newton coupling, parallel-implicit brings a numerical benefit. What exactly do you mean by “not sm…

Hi Benjamin, Yes, explicit coupling cannot work with FSI3. This coupled problem is too challenging to solve without FSI subiterations. Clarification on “Not Smooth” With serial-implicit, the time evolution of the forces (lift and drag) is smooth, as expected. With parallel-implicit, the forces ex…

OK, I see. Yes, sth like this I also observed with underrelaxation. This problem should go away with quasi-Newton however :crossed_fingers:

Serial-implicit versus parallel-implicit

Using preCICE

gdenayer February 5, 2025, 7:24am 5

The “non smooth” results issue I observed with the parallel-implicit scheme is solved. The checkpoints in my CFD solver were not correctly implemented.

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Serial-implicit versus parallel-implicit

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