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Vortex Detection Methods 3d Flow

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Old   August 4, 2013, 08:22
Default Vortex Detection Methods 3d Flow
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Hi everyone,

i have a 3d wind field, in other words a 3d matrix 300*100*200 (using matlab)
i have been making nice videos with curl/isosurface commands ...
lately it has come to my attention that it is possible to use other vortex detection methods such as;
delta criterion,q criterion , lambda 2, curl (most common) at the moment among these I am using the curl of velocity (vorticity) and the q criterion
but i have no idea how you would implement delta criterion or lambda 2#
i know this is a very specific question
but maybe someone could help ?
thanks in advance
there is also a related article but i dont get it
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Old   December 7, 2014, 11:45
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i'm looking for the same thing, i'd love to visualize the shed vorticies on my simulation
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Old   December 8, 2014, 11:45
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Scott Rumage
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An article titled “Some Computation Required: Vortex Visualization Revisited” by Scott Imlay of Tecplot may be helpful to your work. Here is a link: isited.pdf

Some of the capabilities you are seeking are now included with Tecplot 360 EX. You can try the demo version of this application at this link:

Scott R.
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Old   December 18, 2014, 07:33
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Jack Chilvers
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I recently completed my MSc thesis focusing on vortex propogation downstream of a wingtip in ground effect. To visualise the intensity of the filament I elected to use the normalised axial velocity (u/U_inf) and crossflow velocity (sqrt[v^2 + w^2]/U_inf), both of which worked nicely for me. I hope this helps!
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Old   January 22, 2015, 13:39
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Hi Jack,

Could you tell me if you used a separate post processing software to help with your visualizations?

I am currently finishing a final year project for Mech degree on simulation the wake of a wind turbine to analyze the vortical flows. I have created the sim in STAR CCM+ but it does not seem great for the post processing imagery.

I have tried using AMIRA and Avizo Wind, but input file acceptance is a big issue. Which is a shame as they are both fantastic for post processing.

Any input appreciated

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