2- phase flow with VOF

minu · August 18, 2015, 01:21

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

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

August 18, 2015, 01:21	2- phase flow with VOF	#1
minu New Member minu Join Date: Aug 2015 Posts: 3 Rep Power: 10	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

August 19, 2015, 09:28	surface tension	#3
Parisa New Member Join Date: Aug 2014 Posts: 13 Rep Power: 11	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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August 19, 2015, 07:24		#2
minu New Member minu Join Date: Aug 2015 Posts: 3 Rep Power: 10	no one can help me???/ i need your help friends...