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Mixing between two fluids (species transport) |
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February 22, 2018, 05:51 |
Mixing between two fluids (species transport)
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#1 |
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Join Date: Oct 2017
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Hi guys, currently i m working on simulation regarding the mixing between fluid A and B from two different inlets...i m using species transport model...i know that the bulk species has to be at the last in the mixture template...My bulk species is fluid A.
Fluid A = pure water (inlet 1) Fluid B = water with dye (inlet 2) I have set the mass fraction of dye in inlet 1 as 0 whereas the mass fraction of dye in inlet 2 as 0.2... Afterwards, when i output the mass fraction of dye in particular plane (located at further downstream of the mixing channel), the mass fraction of dye becomes nearly zero (10^-15)...i have expected that mass fraction will reduce but not equal to 0...is it i miss out something in the settings or this is normal results for species transport? Even though i exchange the bulk species, the result still the same, the mass fraction of the water becomes nearly zero... i really need some help in this case... |
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February 23, 2018, 00:59 |
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#2 | |
Senior Member
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Quote:
Last edited by ashokac7; February 23, 2018 at 01:00. Reason: adding extra comment |
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February 23, 2018, 01:30 |
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#3 |
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Dear ashokac7, thank you for your quick response, do u mean the UDS (User-Defined Scalar) in boundary condition?change it from 0 to 1?
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February 23, 2018, 02:11 |
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#4 | |
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Quote:
What are the mass flow rate are you using for fluid A and B.? |
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February 23, 2018, 04:49 |
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#5 | |
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February 28, 2018, 09:22 |
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#6 |
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ehsan
Join Date: Sep 2014
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Hi Hong,
I guess you need to let the transport equation of the species converges. I mean usually, even in steady solutions, it takes time for the species to propagate from the inlet. My suggestion is to patch the domain for the species (with a reasonable initial guess i.e. 0.1 ) and let the residuals drop below 10^-6 (if possible). |
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March 1, 2018, 00:12 |
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#7 | |
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Quote:
Thank you for your opinion and guidance, Mr.e_cfd! |
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