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

solidification process

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 16, 1999, 02:24
Default solidification process
  #1
Young
Guest
 
Posts: n/a
Hi1 I'm doing a cfd analysis of solidification process using STAR-CD V3.10

I would like to know how can I model the interface region (what we called 'mushy zone').

I welcome your comments for this case. Regards,

Young
  Reply With Quote

Old   December 18, 1999, 15:31
Default Re: solidification process
  #2
Sanjeeb pal
Guest
 
Posts: n/a
I assume you are using the enthapy formulation and are solving for porosity also. I once thought of using STAR to do something similar. Could you post more details about the implementation in STAR.
  Reply With Quote

Old   December 19, 1999, 15:06
Default Re: solidification process
  #3
Hong
Guest
 
Posts: n/a
Hi, I don't know STAR-CD, I can only say something according to my experience.

firstly, you should compute the temperature field with energy conservation equation, by using this equation, you are supposed to know the relationship between the temperature and solid fraction, f-T curve.

secondly, you can use porous media theory to simulate the mushy zone, suppose you know the relationship between the solid fraction and pressure resistance (Darcy formula).

thirdly, you can include the component redistribution during solidification, and then you can compute the liquidus and solidus with the contents of components.

forthly, suppose you include the third step, then you can get a good approximation of the f-T curve, this is important for accuratly modeling.

fifthly, thermal and solutal bounancy should be included, just by Bousinesque's assumption.

sixthly, you should consider whether to employ the assumption of 'equilibrium solidification'.

seventhly, turbulence model in mushy zone is unknown, you can employ any turbulence model as you like, and then you can say a lot of words to prove your validity.

eighthly, you 'd better use a fine grid to model the mushy zone since the mushy zone is usually very thin and quite unstable, I think this is very important.

ninthly, it is better to employ a fast solver in this simulation, maybe this is the most difficult part.

Good luck

Hongliang
  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
Powder melting/solidification deposition process Michael FLUENT 0 February 19, 2007 00:11
Help: steady solidification process yecm2000 FLUENT 0 June 29, 2005 01:39
Solidification Henrique Argentieri Phoenics 1 September 13, 2002 12:31
solidification process Li Zhiguo Phoenics 1 August 28, 2001 06:01
solidification process Barman Tambunan Main CFD Forum 0 April 27, 2000 22:17


All times are GMT -4. The time now is 07:53.