Slug Flow in channel

yasna · October 1, 2009, 18:24

Dear All
I am trying to model the Slug Flow in rectangular channel by 2D simulation. The dimentions are length=8000mm and height=100mm. The grid consists of 100000 quadrilateral elements. There is some problem in convergence of continuity equation.

Major properties of model are:
-2d,vof,Standard k-omega,pressure based
-distinct velocity inlet for air and water,pressure outlet for outlet
-equ:flow,volume fraction,turbulence
-pressure velocity coupling=PISO
-descretization Scheme

ressure-presto,momentum=quick and for other equations=second order

both of phase are incomperssible. Lower 50% of channel is filled by water and upper 50% section is full of water. The enterance velocity of water=2m/s and enterance velocity of air=10m/s.
I know the main reason of problem is intial condition. but unfortunately,I cant find the appropriate IC for this turbulence model.

Any suggestions will be appreciated.
Thanks in advance

Figd84 · October 2, 2009, 09:20

Have you tried with k-epsilon?? to knlow if the problem is the turbulence model.

yasna · October 2, 2009, 14:21

Hi figd84
thanks for your suggestion but I tried k-e befor and I have same problem again.

October 1, 2009, 18:24	Slug Flow in channel	#1
yasna New Member yasna razavi Join Date: Sep 2009 Location: Iran,tehran Posts: 3 Rep Power: 16	Dear All I am trying to model the Slug Flow in rectangular channel by 2D simulation. The dimentions are length=8000mm and height=100mm. The grid consists of 100000 quadrilateral elements. There is some problem in convergence of continuity equation. Major properties of model are: -2d,vof,Standard k-omega,pressure based -distinct velocity inlet for air and water,pressure outlet for outlet -equ:flow,volume fraction,turbulence -pressure velocity coupling=PISO -descretization Schemeressure-presto,momentum=quick and for other equations=second order both of phase are incomperssible. Lower 50% of channel is filled by water and upper 50% section is full of water. The enterance velocity of water=2m/s and enterance velocity of air=10m/s. I know the main reason of problem is intial condition. but unfortunately,I cant find the appropriate IC for this turbulence model. Any suggestions will be appreciated. Thanks in advance

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October 2, 2009, 09:20		#2
Figd84 Member Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 17	Have you tried with k-epsilon?? to knlow if the problem is the turbulence model.

October 2, 2009, 14:21		#3
yasna New Member yasna razavi Join Date: Sep 2009 Location: Iran,tehran Posts: 3 Rep Power: 16	Hi figd84 thanks for your suggestion but I tried k-e befor and I have same problem again.