How can get Q criterion in RANS simulation

R786 · February 18, 2023, 14:03

Hello,
I have Q criterion to find for my RANS simulation, and I would like to use a method that does not require coding as I do not know how to do coding, how can I use paraview to do the Q criterion? It shows 0 for my simulation.
Thanks
Rabia

flotus1 · February 18, 2023, 15:33

You can use the "gradient of unstructured dataset" filter in Paraview. It can compute the Q-criterion from the velocity vector field.

FMDenaro · February 18, 2023, 15:50

Quote:

Originally Posted by R786

Hello,
I have Q criterion to find for my RANS simulation, and I would like to use a method that does not require coding as I do not know how to do coding, how can I use paraview to do the Q criterion? It shows 0 for my simulation.
Thanks
Rabia

You could alos use Tecplot:
https://www.tecplot.com/2017/05/15/c...n-tecplot-360/

However, be aware that from a RANS solution you can extract nothing but the main statistical flow structure.

R786 · February 19, 2023, 05:19

It does not appear for my simulation, there is only gradient and no gradient of unstructured dataset.

R786 · February 19, 2023, 05:24

Okay i will try that however is there a quick code to extract the number of particles in my simulation, I am also having issues with the number of particles in my simulation, and I cannot extract the exact number of particles to plot them against time.

February 18, 2023, 14:03	How can get Q criterion in RANS simulation	#1
R786 Member West Midlands Join Date: Aug 2022 Posts: 62 Rep Power: 3	Hello, I have Q criterion to find for my RANS simulation, and I would like to use a method that does not require coding as I do not know how to do coding, how can I use paraview to do the Q criterion? It shows 0 for my simulation. Thanks Rabia

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February 18, 2023, 15:33		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	You can use the "gradient of unstructured dataset" filter in Paraview. It can compute the Q-criterion from the velocity vector field.

February 19, 2023, 05:19		#4
R786 Member West Midlands Join Date: Aug 2022 Posts: 62 Rep Power: 3	It does not appear for my simulation, there is only gradient and no gradient of unstructured dataset.

February 19, 2023, 05:24		#5
R786 Member West Midlands Join Date: Aug 2022 Posts: 62 Rep Power: 3	Okay i will try that however is there a quick code to extract the number of particles in my simulation, I am also having issues with the number of particles in my simulation, and I cannot extract the exact number of particles to plot them against time.