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[General] 3D plot Q criterion

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Old   December 2, 2017, 16:25
Default 3D plot Q criterion
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Marius Lang
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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!
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Old   November 25, 2021, 14:42
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ioannis filippou
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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.
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