|April 8, 2014, 17:50||
Join Date: Feb 2013
Posts: 34Rep Power: 5
I'm trying to learn how twoLiquidMixingFoam works and also how fine the solution is, so I run a very simple test case, reproducing famous experiment by Reynolds.
In order to see if the solver works properly, I imposed a zero diffusivity between the two species and a laminar flow (turbulence off, Dt ab =0). Re number is around 100 and the duct is quite short.
In my opinion this should mean that the two liquid are completely non-miscible and so the should be transported w/o any mixing, i.e. the transport equation becomes:
ddt(alpha1)+div(phi,alpha1) == 0
What I actually got looks quite strange to me. I attached a picture of the solution. As you can see, there's a wide region of mixing between the two liquids.
On the other hand, I implemented a steady state transport eq in simple algorithm ( div(phi,a) == 0 ) and solved a similar case ("a" is a non-reactive non-diffusive passively transported scalar used as a marker. In that case I actually got that "a" is simply transported w/o mixing, as I supposed.
The case definition is attached .
Can you please help me? Am I wrong or is it a solver fault?
Thank you in advance
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