# Force calculation- CFD-REEF3D

**URL:** https://discourse.paraview.org/t/force-calculation-cfd-reef3d/11809
**Category:** ParaView Support
**Created:** [April 4, 2023, 5:51pm UTC](https://discourse.paraview.org/t/force-calculation-cfd-reef3d/11809 "2023-04-04T17:51:04Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Keshav\_Pathak](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/k/6bbea6/32.png) [@Keshav\_Pathak](https://discourse.paraview.org/u/Keshav_Pathak)
#### Post date: [April 4, 2023, 5:51pm UTC](https://discourse.paraview.org/t/force-calculation-cfd-reef3d/11809/1 "2023-04-04T17:51:04Z")

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I am using REEF3D for CFD purposes. The REEF3D uses Immersed boundary method (Ghost Cell Method) to define the solid structure in Fluid Domain (with a rectangular cartesian grid). For such a structure defined by IBM, how the drag and lift can be computed in Paraview GUI?