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

Phase change process

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 28, 2001, 12:31
Default Phase change process
  #1
Sang-jin Lee
Guest
 
Posts: n/a
Hello, everyone!

My name is Sang-Jin Lee, and I'm a graduate student studying in numerical heat transfer and fluid flow. I was engaged in a project that analysis the heat transfer processing, solidifying & melting, with Phase Change Material(PCM) just after finishing STAR-CD tutorial 3.1. two weeks ago. As you know, no example of PCM in STAR-CD tutorial, It was so hard for me even to find out a paper or an application related with Phase change method using STAR-CD. I think the key point in this problem is coding user sub-routine including mushy region and latent heat. But, in my poor knowledge from just STAR-CD tutorial, I have a no idea how to approach and which part in solution algorithm I have to modify. It's so important thing for me to fulfill this project successfully because I'm going to write my graduation essay by using STAR-CD application like this. Is there any method to solve this one? I'm behind of time. Any assistance or advice that you can give me will be greatly appreciated.

Thanks in advance.

Sang-Jin Lee
  Reply With Quote

Old   October 30, 2001, 05:07
Default Re: Phase change process
  #2
Jing
Guest
 
Posts: n/a
Hi,

There are several user subroutine which are used to control the properties of the phase change:

DRHEAT: droplet heat DRMAST: droplet mass transfer

And also, DROICO is for the droplet initial condition.

Hopfully it is helpful.

Jing
  Reply With Quote

Old   November 4, 2001, 10:56
Default Re: Phase change process
  #3
Sang-Jin Lee
Guest
 
Posts: n/a
Thank U so much, Jing!

As U said, we have to use several user subroutine depending on the characteristic of a simulation. Let me say about my case briefly first,

A solid PCM is charged in the cylindrical can which is perfectly insulated around of its body except both sides. Suddenly temperature of one side will be changed, and the phase of PCM will be also changed gradually.

So I think the user routines U said, DRHEAT, DRMAST..., are not suitable here. I'm considering SORENT, SORMOM, DENSIT,VISMAL,CONVET,POSDAT in this case. Is my approach of this right?
  Reply With Quote

Old   November 6, 2001, 06:54
Default Re: Phase change process
  #4
Joern Beilke
Guest
 
Posts: n/a
or you can use the COMET program , which is also available from Computational Dynamics.
  Reply With Quote

Old   November 28, 2001, 10:05
Default Re: Phase change process
  #5
Jing
Guest
 
Posts: n/a
Hi,

the subroutines I suggested are suitable for the gas and liqid two phase flow with a phase change. For your case, please try the others. May be you can check the tutorial of the StarCD and find out a similar case.

Good Luck!

Jing
  Reply With Quote

Old   December 5, 2001, 06:17
Default Re: Phase change process
  #6
ckuo
Guest
 
Posts: n/a
In general, StarCD does not provide feature for solving solidification/melting phase change problem, because there is no such model included to provide such physics in Star. If Star is the only thing you can use to do it, there maybe something you can try (although I haven't try it myself). Use a subroutine to define when and where phase changes and account for the latent heat. In the solid phase, use subroutine to change fluid viscosity to infinity to freeze flow (so this is still single phase). However, you lose wall function if you want k-e turbulence model. Check out the enthalpy-porosity method to see if you can apply that in StarCD. Hope this would give you a lot trouble. and good luck.
  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
Two phase flow with phase change Ahmad Al-Zoubi CFX 1 November 26, 2008 04:59
Model foaming process: change the volume / density pmp77 CFX 0 November 18, 2008 10:53
phase change process shen qingqing FLUENT 0 September 7, 2008 09:29
phase changing process in subroutine.. mspark CD-adapco 0 March 26, 2004 12:16
Phase Change in CFX derrek CFX 0 June 9, 2003 18:27


All times are GMT -4. The time now is 02:45.