CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

air into box filled with water, outflow for water at bottom

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 16, 2015, 16:11
Default air into box filled with water, outflow for water at bottom
  #1
New Member
 
Join Date: Jul 2015
Posts: 1
Rep Power: 0
dieterdanger is on a distinguished road
Hello forum members,
my name is Peter from Germany. I need to model the following situation and I wanted to ask you politely if my assumptions are correct:

A box (l/w/h 500mm/300mm/300mm) made of aluminium is filled with water. At the bottom of the box there is an outflow that is initially closed. At the top of the box is an air pressure inlet that is limited to 200 kPa (mass flow rate is approx. 0.008 kg/s) and is also initally closed.

I want to model the two phase behavior, more precisely the outpressing of the water by air, after inlet and outflow are opened simultanely.

What I did so far is:
(1) Since the box is symmetric in width direction I use a 2D-model.
(2) pressure based, transient solver, gravity enabled
(3) multiphase - VOF, Implicit, Implicit Body Force, 2 eulerian phases
(4) viscous model: i tried laminar and k-epsilon realizable
(5) i defined two materials, water and air
(6) phase 1: air, phase 2: water. interaction by surface tension coefficient 73.5 dyn/cm
(7) operating conditions: operating pressure 101325 pascal, gravity enabled, right spot of reference pressure location (= no water)
(8) inlet as massflow inlet, flow direction normal to water surface, no initial gauge pressure. mass flow rate (phase 1, air): 0.008 kg/s, mass flow rate (phase 2, air): 0 kg/s
(9) outlet aus pressure outlet. gauge pressure: 0 pascal, backflow normal to boundary. phase 2 backflow volume fracion: 1
(10) initialized the solution by massflow inlet and patched the water filled area accordingly

My problem is that the simulation results to not correspond to what I have measured by pressure and massflow sensor. Since I'm relatively new to this area of simulation I want to ask how you would model such a problem and if I did something wrong so far!

Thank you very much
Peter
dieterdanger is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
3D multiphase micro model: mixing effect of air and water at the T junction ehsanfareed FLUENT 2 March 22, 2015 22:29
Is it possible to integrate air through a system with mixture of air and water? Hale OpenFOAM Post-Processing 1 September 30, 2013 08:57
Geometry BC's for coupled DPM water spray in closed container of air dan86 FLUENT 0 July 24, 2013 05:10
Coupled DPM water spray inside enclosed volume of air dan86 FLUENT 0 July 19, 2013 11:23
moving water from a chamber using air Matt Mason CFX 0 December 2, 2003 19:46


All times are GMT -4. The time now is 04:54.