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-   -   Vortex Detection Methods 3d Flow (https://www.cfd-online.com/Forums/visualization/121722-vortex-detection-methods-3d-flow.html)

 beyonder August 4, 2013 08:22

Vortex Detection Methods 3d Flow

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 ?
there is also a related article but i dont get it http://jeb.biologists.org/content/211/8/1221.long

 SB123 December 7, 2014 11:45

i'm looking for the same thing, i'd love to visualize the shed vorticies on my simulation

 scott_rumage December 8, 2014 11:45

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: http://www.tecplot.com/my/free-trial-software/

Regards,
Scott R.

 jackchilvers December 18, 2014 07:33

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!

 Field85 January 22, 2015 13:39

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

Declan.

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