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#1 |
New Member
Sung jin Bae
Join Date: Jul 2021
Posts: 3
Rep Power: 5 ![]() |
I'm currently simulating flow inside a reverse-osmosis membrane channel (feed side) with spacers included. The problem is, I want to quantify recirculation zones occurring behind the spacers as the zones with low-velocity are accumulated with solute and are prone to fouling. These spacer configurations are to be compared so that I can see which configuration is the best.
I have read other posts regarding post-processing recirculation regions, but in my case, I don't believe any of those apply to my case because i) my simulation is carried out in 3D; making a cross sectional area and computing the flow that passes it won't capture the flow rate accurately. ii) my simulation conditions have low Reynold's number. I don't see much recirculation with velocity vector profiles. Why aren't the recirculation zones visible? I have tried viewing shear stress and shear stress parallel to the flow direction. I'm not sure if integrating it gives me an accurate result. Any suggestions? |
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#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,925
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For a 3D flow, I suggest to detect the vortical structures using a methods such as the lambda-2.
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#3 |
New Member
Sung jin Bae
Join Date: Jul 2021
Posts: 3
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I've just read the Lambda2 method on detecting recirculation regions. As far as I know, there aren't any built-in methods for doing this in CFX post. Do I have to define a variable via expressions and variable to detect the vortices?
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#4 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,925
Rep Power: 73 ![]() ![]() ![]() |
Quote:
However, Tecplot has also the internal lambda-2 representation but I don’t like how it works. |
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