# Running preCICE on a Cluster: The linear system of the RBF mapping from mesh Solid-Mesh to mesh Fluid-Mesh has not converged

**URL:** <https://precice.discourse.group/t/running-precice-on-a-cluster-the-linear-system-of-the-rbf-mapping-from-mesh-solid-mesh-to-mesh-fluid-mesh-has-not-converged/708>\
**Category:** Using preCICE\
**Tags:** openfoam, adapters, data-mapping, parallel\
**Created:** [August 31, 2021, 4:36pm UTC](https://precice.discourse.group/t/running-precice-on-a-cluster-the-linear-system-of-the-rbf-mapping-from-mesh-solid-mesh-to-mesh-fluid-mesh-has-not-converged/708 "2021-08-31T16:36:28Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![JulianSchl](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/julianschl/32/692_2.png) [@JulianSchl](https://precice.discourse.group/u/JulianSchl)\
**Post date:** [September 22, 2021, 10:00am UTC](https://precice.discourse.group/t/running-precice-on-a-cluster-the-linear-system-of-the-rbf-mapping-from-mesh-solid-mesh-to-mesh-fluid-mesh-has-not-converged/708/7 "2021-09-22T10:00:54Z")

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Hi 👋

> [@uekerman](#):
>
> You use a support radius of 5.

I selected the support radius just for testing purposes (I thought this value is conservative enough). The airfoil has the following dimensions:  
chord length: 0.144 m  
maximum thickness: 0.017 m  
span length: 0.15 m

> **see screenshot**
>
> ![sizes](https://global.discourse-cdn.com/free1/uploads/precice/original/1X/57a6665066335702b10201d55db252885d8cf87b.png)

Because I’m not exactly sure how to calculate the support radius, I’ve opened a seperate [topic](https://precice.discourse.group/t/support-radius-for-rbf-different-than-gaussian/728).

> [@uekerman](#):
>
> Just to be sure: both your meshes mesh the same geometry. Meaning, when you plot both at the same time they lie nearly over each other, right?

It should be … I was trying to visualize it with paraview using the export function of preCICE, but with the RBF mapping I’m getting many different files, which don’t show the expected mesh when selecting the glyph filter. Is there a way to plot such meshes with preCICE?

Still the mapping works on the local machine for \> 2000 timewindows …

> [@uekerman](#):
>
> Can you visualize your fluid partitions?

You mean you want to see how the case is decomposed?

> [@uekerman](#):
>
> Any chance to cut this lid?

I don’t understand what you mean by that …

> [@uekerman](#):
>
> what happens when you run with a different number of ranks?

I tried it with different number of processors … 1 … 8 … 35,  
but still the same issue.

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_[View the full topic](https://precice.discourse.group/t/running-precice-on-a-cluster-the-linear-system-of-the-rbf-mapping-from-mesh-solid-mesh-to-mesh-fluid-mesh-has-not-converged/708)._