# Abnormal deformation of the object mesh

**URL:** https://precice.discourse.group/t/abnormal-deformation-of-the-object-mesh/2904
**Category:** Using preCICE
**Tags:** openfoam, fsi, calculix
**Created:** [April 7, 2026, 6:16am UTC](https://precice.discourse.group/t/abnormal-deformation-of-the-object-mesh/2904 "2026-04-07T06:16:18Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![HHao-gihub](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/hhao-gihub/32/2930_2.png) [@HHao-gihub](https://precice.discourse.group/u/HHao-gihub)
#### Post date: [April 7, 2026, 6:16am UTC](https://precice.discourse.group/t/abnormal-deformation-of-the-object-mesh/2904/1 "2026-04-07T06:16:18Z")

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I’m currently using overlapping grids to test a floating object, but only half of it is moving, and I’m seeing the jagged edges shown in the image. How can I fix this?

 ![image](https://global.discourse-cdn.com/free1/uploads/precice/original/2X/4/400b978e19002c977fdaf1cce4248763ad347856.jpeg)

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<div class="post-metadata">

### Author: ![HHao-gihub](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/hhao-gihub/32/2930_2.png) [@HHao-gihub](https://precice.discourse.group/u/HHao-gihub)
#### Post date: [April 7, 2026, 9:30am UTC](https://precice.discourse.group/t/abnormal-deformation-of-the-object-mesh/2904/2 "2026-04-07T09:30:38Z")

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My model is a hexagonal floating block. I used the nearest-projection mapping method.

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### Author: ![fsimonis](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/fsimonis/32/6_2.png) [@fsimonis](https://precice.discourse.group/u/fsimonis)
#### Post date: [April 10, 2026, 2:15pm UTC](https://precice.discourse.group/t/abnormal-deformation-of-the-object-mesh/2904/3 "2026-04-10T14:15:27Z")

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Hi,  
I suggest enabling exports in both preCICE participants and visualizing the provided meshes together in Paraview.  
This is a reliable way to check if both solvers use the same coordinate system when exposing their meshes. This also allows you to inspect if the displacements look correct.

> **[Export configuration](https://precice.org/configuration-export.html)**
>
> You can export your coupling meshes to various formats. This is a great feature for debugging as you can monitor how preCICE maps and exchanges data. On this page, we explain how to configure such exporters.