What is "outgoing flux" for species?

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Tsubasa
Posts: 175
Joined: Fri Nov 20, 2020 4:09 am

What is "outgoing flux" for species?

Post by Tsubasa »

Hello,

Now, I am trying to scalar transport simulation.
I impose "1.0" of "Prescribed Value" for inlet condition, and "0.0 (zero)" of "Prescribed (outgoing) flux" for outlet condition.

Here I am wondering that what is "Prescribed (outgoing) flux" for outlet condition.
If I define zero flux for "species for backflow" at outlet, is outlet boundary equal to free outlet condition (or wall condition)?
a.png
I just want scalar to come from inlet and go out from outlet boundary. So it is just no gradient for scalar concentration.

Best regards,
Tsubasa
Yvan Fournier
Posts: 4070
Joined: Mon Feb 20, 2012 3:25 pm

Re: What is "outgoing flux" for species?

Post by Yvan Fournier »

Hello,

I think the value given in the GUI is used only if the fluid comes back in the outlet (so should be more logical for free inlet/outlet than outlet). It may also affect the diffusive term. You can simply leave it at 0.

Best regards,

Yvan
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