# Stagnant Zone

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 April 29, 2019, 00:24 Stagnant Zone #1 New Member   Join Date: Feb 2019 Posts: 5 Rep Power: 7 Hi everyone, I did a simulation on Euler-Euler gas-liquid bioreactor and the result seems good. Afterward, i want to find the stagnant zone for liquid phase (the percentage of volume with low velocity per total volume). How can i discover the volume under certain velocity (lower than 10^-3 m/s)? I would be really glad if there are some suggestions Thanks

 May 9, 2019, 13:46 Stagnant Zone #2 New Member   Join Date: Feb 2019 Posts: 5 Rep Power: 7 Hi I am still wondering how to find the volume of the stagnant zone and i think it might be possible to do that through expression in CFD-post. What would be a good way to do that in expression? I mean how to write the expression since there is no formula about it I hope someone can help me with this issue Regards

January 22, 2024, 08:48
Stagnant Fluid
#3
New Member

Gabriel Binelli
Join Date: May 2020
Posts: 2
Rep Power: 0
Quote:
 Originally Posted by Fidho.im Hi I am still wondering how to find the volume of the stagnant zone and i think it might be possible to do that through expression in CFD-post. What would be a good way to do that in expression? I mean how to write the expression since there is no formula about it I hope someone can help me with this issue Regards
Hey, were you able to do this post-processing?

 January 24, 2024, 08:10 #4 New Member   Join Date: Sep 2021 Posts: 7 Rep Power: 4 Hey, Would setting an iso-clip with your defined max velocity to create a surface, and then using surface integrals --> sum --> mesh --> cell volume to obtain a total volume work? You could then multiply this value with the average volume fraction (within the iso-clip) of your desired phase to obtain an approximate value, but I'm just guessing here.

 Tags cfd - post, fluent