CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Siemens

Magnetic stiring in a glass

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 7, 2000, 12:51
Default Magnetic stiring in a glass
Bo Jensen
Posts: n/a

I have just started modelling a glass with a fluid that is moved by a little magnet rod located on the bottom of this glass. The magnet is moved by a magnetic field from a surface placed below the glass. Now, it there anybody who has any sugestions to how this can be done??

What I have tried untill now is just to say that a area in the the centre of the flow domain (at the bottom) is removed from the geometry (Area is corresponding to the area that would have been occupied by the magnet rod during one revolution). Then I have put on a rotational velocity on the walls of the "rod" area. But is that true....


  Reply With Quote

Old   March 13, 2000, 03:42
Default Re: Magnetic stiring in a glass
Posts: n/a

When using STAR-CD and moving domains one must clearly differentiate between wall motion normal and tangential to the fluid.

If the wall motion is normal to the fluid then it pushes the fluid with it.

If the wall motion is tangential to the fluid then its influence is only felt in via shear force.

If you apply a rotational velocity on the walls of the "rod" area then you are only adding the shear force, not any of the normal component of the wall moving.

To model the normal component you need to use either rotating reference frames or full moving mesh. If this is one of these little lozenge mixers seen in labs etc then the assumptions for rotating references frames are inappropriate for this.

The full moving mesh may seem a little daunting but within Prostar there is are commands MIXVES and MIXASI that set up and run such cases in a single command


  Reply With Quote


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
Radiation through: glass – air cavity – glass Yingchun CFX 7 February 27, 2012 16:46
magnetic field, workbench alireza ramezani Main CFD Forum 0 March 13, 2008 14:42
pressing of glass arun kumar Main CFD Forum 0 August 21, 2007 06:35
Hour Glass jballen OpenFOAM Running, Solving & CFD 2 November 11, 2005 04:04
Fluid-magnetic coupling Leonardo Trindade Main CFD Forum 2 June 28, 1999 06:02

All times are GMT -4. The time now is 14:57.