# [General] 3D plot Q criterion

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 December 2, 2017, 16:25 3D plot Q criterion #1 New Member   Marius Lang Join Date: Sep 2017 Posts: 19 Rep Power: 8 Hello, I would like to plot 3D vortice cell with Q criterion, how can this be done? I have computed my solution in openFoam 2D (front and back is set as empty). When I try to plot the Q criterion in paraview I only get the Q criterion in the XY-plane, I want it such that it also extends into the Z-plane? This is just for learning purposes before I move onto 3D, which takes ages to compute on my computer. Help is very much appreciated!

 November 25, 2021, 14:42 #2 New Member   ioannis filippou Join Date: Nov 2021 Posts: 8 Rep Power: 4 You have to use the 3D equation set i guess. What i am using is this set of equations {s11} = {dudx} {s12} = 0.5*({dudy}+{dvdx}) {s13} = 0.5*({dudz}+{dwdx}) {s22} = {dvdy} {s23} = 0.5*({dvdz}+{dwdy}) {s33} = {dwdz} {Omga12} = 0.5*({dudy}-{dvdx}) {Omga13} = 0.5*({dudz}-{dwdx}) {Omga23} = 0.5*({dvdz}-{dwdy}) {A} = 2*{Omga12}**2 + 2*{Omga13}**2 + 2*{Omga23}**2 - {S11}**2 - {S22}**2 - {S33}**2 - 2*{S12}**2 - 2*{S13}**2 - 2*{S23}**2 {Q} = 0.5*{A} But i am using Tecplot which has an add equations tab. I suppose paraview has this option too.

 Tags paraview 4.1