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Turbulent mixing
Posted Sep 30, 2023, 3:26 a.m. EDT Chemical, Computational Fluid Dynamics (CFD), Physics Interfaces Version 5.6 0 Replies
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Trying to estimate diffusion from surface in turbulent flow using COMSOL 5.6.
Two steps calculation:
Study 1: "Turbulent Flow, SST", "Wall treatment"=>"Low Re"
Study 2: "Transport of Diluted Species" => "Transport Properties 1" => "Turbulent Mixing 1"
I expected the diffusion coefficient to be the sum of the original value and additional amount for turbulent mixing. doc.comsol.com/5.6/doc/com.comsol.help.cfd/cfd_ug_chemsptrans.11.098.html
However it seems that instead, the turbulent mixing replaced the previous value, so diffusion near the wall became much lower compared to without turbulent mixing. I tried to overcome this by using
"Turbulent Mixing 1" => "turbulent kinematic viscosity" => "user defined" =>
spf.nuT+0.71*D_material
but not sure if this is a valid solution
Hello Boaz Tagansky
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