CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Fluid properties

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 8, 2006, 16:18
Default Fluid properties
  #1
fea user
Guest
 
Posts: n/a
Is it possible to give magnetic properties (permeability, conductivity) to fluid domain (for example welding)? Or how can I use an ANSYS magnetic analyses results as an CFX load or boundary condition?
  Reply With Quote

Old   May 8, 2006, 16:28
Default Re: Fluid properties
  #2
opaque
Guest
 
Posts: n/a
Dear fea user:

Could you please let us know what your application is?

Are you trying to simulate magnetic forces in the fluid (Lorentz)? or heat dissipation (Joule) ?

Do you already solved the problem on the magnetic/electric side ? or you still have to do so?

Is it a transient magnetic/electric simulation? Does include AC currents, or just DC?

The answers depends on the problem?

Good luck,

Opaque..

  Reply With Quote

Old   May 9, 2006, 09:01
Default Re: Fluid properties
  #3
fea user
Guest
 
Posts: n/a
Dear Opaque,

I don't know which apps (fluent, cfx, or other) could be the better choosing to simulate magnetic-fluid interactions (like welding, electrode-electrolyte, steel melt in furnace). I'd like to use magnetic forces, Lorentz-force, and Maxwell-equations on a fluid model for CFD simulation. The magnetic part of analyse is done. To simplified the problem It's a static magnetic field. There are some coils around an induction furnace with steel melt. This situation the magnetic field generates the fluid (melt) flowing.

Regards fea user
  Reply With Quote

Old   May 9, 2006, 09:12
Default Re: Fluid properties
  #4
opaque
Guest
 
Posts: n/a
Dear fea user,

Within the ANSYS CFX 10.0 solver there is an implementation of the Magnetic Vector Potential, and Electric Potential (for conductor materials). If you use it, it will automatically add the Lorentz forces and Joule heating to the momemtum and energy equations respectively..

If you already have the magnetic induction vector (B), and the Current Density (J), you could use them as input and the ANSYS CFX solver will compute the Lorentz/Joule term again..

A third alternative for you is to create a subdomain over the region the magnetic field is applied, and compute the Lorentz force yourself (JxB) as a momemtum source with Cartesian components.. Do not forget to account for the linearization coefficients since the source term depends on velocity (for some cases it is very important for robustness)

For the first two alternatives, you must contact the CFX help desk and request information (configuration files) of how to activate the MHD beta models in 10.0

Good luck,

Opaque..

  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
air bubble is disappear increasing time using vof xujjun CFX 9 June 9, 2009 07:59
Concentric tube heat exchanger (Air-Water) Young CFX 5 October 6, 2008 23:17
Fluid type amp properties cfdphil OpenFOAM Running, Solving & CFD 1 March 12, 2008 08:01
My Revised "Time Vs Energy" Article For Review Abhi Main CFD Forum 2 July 9, 2002 09:08
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11


All times are GMT -4. The time now is 13:20.