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Fluid Structure Interaction : Weak or Strong Coupling

Posted Jan 27, 2020, 8:47 a.m. EST Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD), Structural Mechanics Version 5.4 1 Reply

Innocentio Loe Certified Consultant
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Hello, I'm new here and pretty much new to COMSOL as well.

So, per my understanding, there are two coupling methods when calculating fluid structure interaction, which is by weak coupling or strong coupling. The FSI Multiphysics in COMSOL gives coupling type such as "Fully Coupled" or "Fluid Loading on Structure".

Now, the documentation covers definition such as One-way coupling or Two-way coupling. I'm not really sure how to relate this with the "weak" or "strong" coupling calculation method. Or maybe they're not related at all?

Some example of One-way coupling in COMSOL shows that the study step for the fluid and solid are divided into two steps. So to my understanding, if I calculate both fluid and solid in a single study step, it will be a Two-way coupling. But then I'm still not sure on how will these relate to the weak and strong coupling terms.

Is there any mention on which coupling method is used by COMSOL? Thanks in advance.

1 Reply Last Post Jan 29, 2020, 1:35 a.m. EST
Innocentio Loe Certified Consultant
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Posted: 5 years ago Jan 29, 2020, 1:35 a.m. EST

Hello, so I've tried to have another look on this problem, and seems like I was mistaken. The "weak" and "strong" coupling I mentioned above seems to be goverened by the solver configuration instead, which in this case I believe is using the Segregated Solver.

Now, the question remains whether the Segregated Solver is using "weak" or "strong" coupling. I understand that there are "Direct" or "Iterated" method for the Segregated Solver, yet still not sure how these two will relate to the "weak" or "strong" coupling calculation that I mentioned before.

I appreciate if anyone can enlighten me on this topic.

Hello, so I've tried to have another look on this problem, and seems like I was mistaken. The "weak" and "strong" coupling I mentioned above seems to be goverened by the solver configuration instead, which in this case I believe is using the Segregated Solver. Now, the question remains whether the Segregated Solver is using "weak" or "strong" coupling. I understand that there are "Direct" or "Iterated" method for the Segregated Solver, yet still not sure how these two will relate to the "weak" or "strong" coupling calculation that I mentioned before. I appreciate if anyone can enlighten me on this topic.

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