# Evolution of mesh and boudaries for FSI problems

**URL:** <https://community.freefem.org/t/evolution-of-mesh-and-boudaries-for-fsi-problems/1248>\
**Category:** General Discussion\
**Created:** [October 5, 2021, 7:43am UTC](https://community.freefem.org/t/evolution-of-mesh-and-boudaries-for-fsi-problems/1248 "2021-10-05T07:43:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![EJariel](https://avatars.discourse-cdn.com/v4/letter/e/258eb7/32.png) [@EJariel](https://community.freefem.org/u/EJariel)\
**Post date:** [October 5, 2021, 7:43am UTC](https://community.freefem.org/t/evolution-of-mesh-and-boudaries-for-fsi-problems/1248/1 "2021-10-05T07:43:17Z")

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Hello,

I need to implement a Fluid-Structure Interaction problem, with a fabric structure immersed in a fluid.

The fluid and solid problems would be resolved one after the other at each iteration: at iteration N, we compute the deformation of the structure, then the fluid parameters with the modified boundary.

I am having trouble translating the modification of the boundary caused by the deformation into code. **What tool should I use to adapt the mesh and boundary at each iteration ?**

If you could direct me to an example (other than the one in the documentation) I would appreciate it immensely.

Right now I am trying to implement it in 2d but I will eventually need to go 3d.

Thank you for your time.