|
[Sponsors] |
April 8, 2014, 18:50 |
twoLiquidMixingFoam: validation
|
#1 |
Member
xxxxx
Join Date: Feb 2013
Posts: 34
Rep Power: 13 |
Hello everybody.
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 Federico
__________________
Federico |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Validation in Transient tasks | MaxakCh | FLUENT | 0 | May 17, 2013 09:59 |
CFX problem in ubuntu (linux) | Vigneshramaero | CFX | 0 | July 13, 2012 11:22 |
CFX-Pre problem, pls help!!! | cth_yao | CFX | 0 | February 17, 2012 01:52 |
Validation test for 2d euler equations in subsonic regime with canonical squares | panou | Main CFD Forum | 2 | August 24, 2011 16:21 |
Urgent: RAE 2822 validation | NID | Main CFD Forum | 0 | September 3, 2004 11:34 |