# Oscillating of Interface in VOF method

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April 14, 2013, 03:12
Oscillating of Interface in VOF method
#1
New Member

amir mofakham
Join Date: Feb 2011
Posts: 8
Rep Power: 8
Hi
I want to use fluent to simulate the motion of a slug through a 2D channel.
I used
-explicit VOF method
-pressure-velocity Coupling= SIMPLE SPATIAL DISCRETIZATION
-Pressure= Presto
-Momentum= Second Order Upwind
-VOlume Fraction=Geo-Reconstruct

I enable Surface Tension force and wall adhesion. I adjust the value of contact angle and surface tension equal to 135 degree and 0.47.
Any other force is not applied to the slug. First I just want to study the performance of fluent on simulation of two phase flow.
When I run fluent, I find out the interface of slug is oscillating and the value of contact angle is not fixed equal to 135 degree.
How can I get ride of this oscillating?

Attached Images
 1.jpg (22.7 KB, 14 views)

Last edited by amir.mofakham; April 14, 2013 at 17:49.

April 14, 2013, 12:14
#2
Senior Member

Khalid Baker
Join Date: Mar 2009
Location: IRAQ
Posts: 155
Rep Power: 10
Can you post a picture illustrates the interface motion this will give best understanding for your problem and give more chances to answered it?

kbaker
Quote:
 Originally Posted by amir.mofakham Hi I want to use fluent to simulate the motion of a slug through a 2D channel. I used -explicit VOF method -pressure-velocity Coupling= SIMPLE SPATIAL DISCRETIZATION -Gradient= least Squares cell based -Pressure= Presto -Momentum= Second Order Upwind -VOlume Fraction=Geo-Reconstruct I enable Surface Tension force and wall adhesion. I adjust the value of contact angle and surface tension equal to 135 degree and 0.47. Any other force is not applied to the slug. First I just want to study the performance of fluent on simulation of two phase flow. When I run fluent, I find out the interface of slug is oscillating and the value of contact angle is not fixed equal to 135 degree. How can I get ride of this oscillating? Thanks in advance

April 14, 2013, 17:52
#3
New Member

amir mofakham
Join Date: Feb 2011
Posts: 8
Rep Power: 8
Quote:
 Originally Posted by kbaker Can you post a picture illustrates the interface motion this will give best understanding for your problem and give more chances to answered it? kbaker
Hi kbaker
I attached a picture. I hope this picture is clear to show my meaning.

 April 15, 2013, 10:27 #4 Senior Member     Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 155 Rep Power: 10 Hey as I see from your image this type of flow is not slug. The water region just compressed and expands but why the water not move down the channel? what prevent it from moving?

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