# Pressure contour

 Register Blogs Members List Search Today's Posts Mark Forums Read

November 4, 2014, 08:36
Pressure contour
#1
New Member

yusuke uchihashi
Join Date: Jan 2014
Posts: 22
Rep Power: 4
Hello!

I study about the fluid dynamics in a bubble column.
The bubble dissolve into the liquid.

In CFD-POST, I got bad results of pressure contours(fig1).
In fig1, bubble(co2) dissolved.
I want to get like this(fig2).
In fig2, bubble(air) didn't resolve.

Why did I get that result?
I get that reslut when I study about the bubble which dissolves into liquid.
And which pressure contours do I have to use?

Thank you!
Attached Images
 pre.jpg (27.4 KB, 12 views) pre2.jpg (24.0 KB, 10 views)

Last edited by japanese student; November 6, 2014 at 00:00.

 November 5, 2014, 23:58 #2 New Member   yusuke uchihashi Join Date: Jan 2014 Posts: 22 Rep Power: 4 Please help my question.

 November 12, 2014, 23:54 detail settings #3 New Member   yusuke uchihashi Join Date: Jan 2014 Posts: 22 Rep Power: 4 I couldn't get any advices of the Pressure contoure, so I give you detail settings. If you give me some advices, I express my thanks! The system:The bubble which dissolves in the liquid rises in the bubble column(2D). The settings: General; transient, gravity -9.8 Models; vof (Explicit), species transfer Materials; water, co2 Phases; phase-1(mixture), phase-2(mixture) Interactions; phase-1(co2)to phase-2(water) mass=5(kg/m3・s) Boundary; inlet(0.14m/s), outflow Solution method; NITA time step; 5e-5 When the mass is much less(0.001kg/m3・s ect ....), the pressure contour is good. Why is the pressure contour is bad, when the mass is big? Thank you!

 December 27, 2014, 12:30 #4 New Member   yusuke uchihashi Join Date: Jan 2014 Posts: 22 Rep Power: 4 Hello,everyone! I probably got the reason the pressure contour is strange. I assume the fluid is the incompressible fluid, but the density has changed after the mass transfer across the liquid-gas interface occered. So, I want to get how to make the density constant. If you tell me some advices, I am very happy. Thanks!

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Mohsin FLUENT 6 January 15, 2015 18:15 Tom Lucius FLUENT 1 December 27, 2011 22:49 Tom Lucius Main CFD Forum 0 December 26, 2011 10:20 emueller CFX 0 May 5, 2009 11:08 KK Khan Main CFD Forum 1 June 25, 2006 23:35

All times are GMT -4. The time now is 21:21.