Stagnant Zone

Fidho.im · April 29, 2019, 01:24

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

Fidho.im · May 9, 2019, 14:46

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

ABgabriel13 · January 22, 2024, 09:48

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?

North Star · January 24, 2024, 09:10

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.

April 29, 2019, 01:24	Stagnant Zone	#1
Fidho.im 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, 14:46	Stagnant Zone	#2
Fidho.im 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

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January 24, 2024, 09:10		#4
North Star New Member Join Date: Sep 2021 Posts: 7 Rep Power: 5	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.