# calculate wall share stress 3D mesh

**URL:** https://discourse.paraview.org/t/calculate-wall-share-stress-3d-mesh/16441
**Category:** ParaView Support
**Created:** [April 8, 2025, 6:26am UTC](https://discourse.paraview.org/t/calculate-wall-share-stress-3d-mesh/16441 "2025-04-08T06:26:13Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![otaolafr](https://discourse.paraview.org/user_avatar/discourse.paraview.org/otaolafr/32/3595_2.png) [@otaolafr](https://discourse.paraview.org/u/otaolafr)
#### Post date: [April 8, 2025, 6:26am UTC](https://discourse.paraview.org/t/calculate-wall-share-stress-3d-mesh/16441/1 "2025-04-08T06:26:14Z")

</div>

Hello,  
I am looking into how to calculate the wall shear stress in my fluid simulation. going around the forum i finished in this two links:  
[https://www.paraview.org/pipermail/paraview/2016-October/038305.html](https://www.paraview.org/pipermail/paraview/2016-October/038305.html)

> **[\[General\] Calculate wall shear stress with paraview -- CFD Online Discussion...](https://www.cfd-online.com/Forums/paraview/235902-calculate-wall-shear-stress-paraview.html)**
>
> Hi, I have a 3D flow over cylinder case in openfoam, and cannot use the postProcess utility to output wallShearStress (WSS) around cylinder (no-slip

but not sure about how to calculate it, the first link suggest:

- Gradient of Unstructured Data Set
- Extract Surface
- Generate Surface Normals
- Calculator filter to compute the wall shear stress from the gradient  
and the surface normals.  
but if I generate the gradient of U i finish with 9 components (different fields) and not a vector/tensor. therefore I am not sure how to do the last step with the calculator, if someone could enlight me with this would be appreciated.