FSI with separate grids.

[Tim Braun]

I am designing a study of elastic responses of structures underwater. An important aspect in calculating vibration is the added mass (effect of accelerating the incompressible fluid around the vibrating object). Instead of using a transient FSI setup, I am seeking to solve the potential flow around the object using a boundary element. The complexity of the boundary element method is higher and utilizes "panels" while I want to stick to linear or quadratic 3d finite elements for the structural elastic deflection.  I would only need the exterior faces to be transferred to the BEM (not to be overly simplistic!) The calculation would need to be coupled such that the potential flow solution updates the solid deflection shape and visa versa.

With all of that wind up, my question is what methods are available for solving by passing solutions between two meshes or perhaps using a connector to map one solution to the other? I suppose I could resort to preCICE but imagine there's a way to run this within a deal ii "program".

I hope my questions are somewhat clear enough, because I'm learning as I go. Any first thoughts are appreciated 

[Tim Braun]

I'll add that I see step-70 as an example, which is time-dependent but does address the coupling process between a solid and fluid. Is that a good place to work from?

[Wolfgang Bangerth]

On 10/8/24 12:19, Tim Braun wrote:
> **

>
> I'll add that I see step-70 as an example, which is time-dependent but does
> address the coupling process between a solid and fluid. Is that a good place
> to work from?

I would suggest looking through all the programs in the range 60-90. Some of
these use particles to couple problems, and some of them use bulk formulations
of surface processes. I don't know that any of them do *exactly* what you
want, but perhaps you can get inspired by reading through the first page of
the introductions to each of these to see what your options are.

Best
W.

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Luca Heltai]

If you want to use BEM, then also take a look at step-34, and at WaveBEM.

Luca

> Il giorno 9 ott 2024, alle ore 01:45, Wolfgang Bangerth <bang...@colostate.edu> ha scritto:

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