# Extract a surface from a block

**URL:** https://discourse.paraview.org/t/extract-a-surface-from-a-block/15906
**Category:** ParaView Support
**Created:** [December 25, 2024, 5:45pm UTC](https://discourse.paraview.org/t/extract-a-surface-from-a-block/15906 "2024-12-25T17:45:09Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Tony98](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/7ba0ec/32.png) [@Tony98](https://discourse.paraview.org/u/Tony98)
#### Post date: [December 25, 2024, 5:45pm UTC](https://discourse.paraview.org/t/extract-a-surface-from-a-block/15906/1 "2024-12-25T17:45:09Z")

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Hi there,

Happy holidays everybody. I would like to compute the wall shear stress for my simulation. The first step would be to extract the airfoil surface. I tried to replicate the instructions from a previous topic: [Calculation of Drag, Wall shear stress, Lift](https://discourse.paraview.org/t/calculation-of-drag-wall-shear-stress-lift/15329) but it doesn’t work for me. I keep getting an entire block.

 ![Screenshot from 2024-12-25 12-44-05](https://discourse.paraview.org/uploads/default/original/2X/e/e26856809d2cfc10d5e55c9acc15c00741bd1524.jpeg)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 30, 2024, 9:13am UTC](https://discourse.paraview.org/t/extract-a-surface-from-a-block/15906/2 "2024-12-30T09:13:03Z")

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please share your data.