# Drag Mismatch with OpenFOAM

**URL:** https://discourse.paraview.org/t/drag-mismatch-with-openfoam/8430
**Category:** ParaView Support
**Created:** [November 18, 2021, 9:16am UTC](https://discourse.paraview.org/t/drag-mismatch-with-openfoam/8430 "2021-11-18T09:16:51Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![twnsplr](https://discourse.paraview.org/user_avatar/discourse.paraview.org/twnsplr/32/5950_2.png) [@twnsplr](https://discourse.paraview.org/u/twnsplr)
#### Post date: [November 18, 2021, 9:16am UTC](https://discourse.paraview.org/t/drag-mismatch-with-openfoam/8430/1 "2021-11-18T09:16:51Z")

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I am trying to calculate the drag on the wing using OpenFOAM. I used the OF forces function and got some drag values. I tried the procedure shown in this [https://www.youtube.com/watch?v=J944HOj\_4b0&t=291s](https://www.youtube.com/watch?v=J944HOj_4b0&t=291s) video to find the drag and lift using paraview but the drag values have a considerable mismatch. After searching around this forum and in google I came to know that paraview does not calculate the viscous drag which has to be calculated using the wall shear stress. I don’t know how to calculate this wall shear stress in the latest release of paraview