# Airfoil Upper and Lower Cp (non-extractable geometry)

**URL:** https://discourse.paraview.org/t/airfoil-upper-and-lower-cp-non-extractable-geometry/6706
**Category:** ParaView Support
**Created:** [March 15, 2021, 3:37pm UTC](https://discourse.paraview.org/t/airfoil-upper-and-lower-cp-non-extractable-geometry/6706 "2021-03-15T15:37:42Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![tripatha](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/f1d935/32.png) [@tripatha](https://discourse.paraview.org/u/tripatha)
#### Post date: [March 15, 2021, 3:37pm UTC](https://discourse.paraview.org/t/airfoil-upper-and-lower-cp-non-extractable-geometry/6706/1 "2021-03-15T15:37:43Z")

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What is the best way to calculate the Cp on the upper and lower surface of an airfoil when you have a non-extractable geometry?