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-   -   2- phase flow with VOF (https://www.cfd-online.com/Forums/fluent-multiphase/158186-2-phase-flow-vof.html)

minu August 18, 2015 01:21

2- phase flow with VOF
 
Hi there...
i want to simulate formation of bubbles (Taylor bubbles) in a microchannel with 2 inlets and 1 outlet. one of inlet is the entrance of air and others are entrances of water. i do these steps but i cant get the answer. after running it seems that air and water do not mix at all. any one can help me????
i am so grateful for any clue.

these are my steps:
define-models-solver-pressure based, implicit
define- multiphase-vof-explicit,co number=.25
define material
define phase-primary phase: water,secondary:air-interaction: check adhsion,surface tention=.072
BC
inlet1(which is inlet of gas)-switch mixture-velocity magnitud=gas velocity-switch phase 2-VF=1
inlet 2 and 3 just like above with liquid velocity and VF=0
all walls-switch mixture-contact angle=50
solve-control solution
solution intialization-with all initial values zero-init
adopt-region-select the inlet of air-mark
solve -patch-phase2(air)-VF=1-select adopt region-patch
iterate with time step=1e-8

minu August 19, 2015 07:24

no one can help me???/:(
i need your help friends...

Parisa August 19, 2015 09:28

surface tension
 
Hi,

Well I don't really know if my answer is relevant, but have you checked your surface tension value? It is under phase interactions.

//Parisa


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