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

3D mixing tank using MRF/SRF

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 2, 2010, 03:46
Default 3D mixing tank using MRF/SRF
  #1
New Member
 
anonymous
Join Date: Oct 2010
Posts: 8
Rep Power: 16
cfd_confuse is on a distinguished road
Hi all,

I am a new user of fluent. Currently, i am facing converging problem with my mixingtank.

This is what i done in gambit:
I have a impeller in a square tank measured 1m by 1m. I have substracted the volume of the impeller (height of hub = 80mm) from the square tank and had split the volume of the impeller with a cylinder measuring 180mm in height and radius=350mm, just enough to cover the entire impeller, to create a moving zone. I then mesh the moving zone w a grid size of 10 and mesh the remaining fluid zone w a grid size of 20. next, i went on to specify the 3 faces of the moving zone as interior so that there is mixing of fluid between the area of moving zone and area outside moving zone.

This is what i done in fluent:
i set the moving zone as a moving reference frame with rotational velocity of 85rpm, with proper rotation-axis origin and rotational axis direction. Then, i set the remaining fluid in the tank as stationary. Next, i set the wall of the impeller to be a moving wall with a rotational velocity = zero relative to adjacent cell zone. (this is the single rotational reference frame model)
For this case, no buffer is needed.

There is some problem converging for the continuity. solution starts to diverge after 6 x 10^-3. i do not know if it is because i set the wrong boundary condition in fluent. can someone enlighten me on what boundary condition to set for this simple mixing tank model? PLEASE HELP ME!!!

Thank You in advance
cfd_confuse 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
Mixing Tank jawidnaik FLUENT 11 October 13, 2010 03:50
about the top of the mixing tank boh_tea FLUENT 7 August 21, 2010 03:58
Mass conservation problem in mixing tank multiphase simulation rockewan FLUENT 0 April 6, 2010 12:34
Modelling mixing tank using MRF Adi FLUENT 6 November 4, 2009 00:28
help about modeling A MIXING TANK hmasenger CFX 2 April 13, 2009 15:21


All times are GMT -4. The time now is 17:51.