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

Water to ice

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 13, 2014, 08:22
Default Water to ice
  #1
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Assume a pipe with fluid inside eg -5 degrees centigrade. Passing through a slab.

Above slab a layer of water eg 10 millimeters, and above the water layer air at eg 15 degrees centigrade.

Meshed every thing, selected; fluids, solids temps, .. k-epsilon, ... Can not see any ice?

What have I missed, please?

Fluent please, or CFX.
visitor is offline   Reply With Quote

Old   May 13, 2014, 11:52
Default
  #2
New Member
 
Ali Jafarizade
Join Date: May 2009
Posts: 22
Rep Power: 10
jafarizade is on a distinguished road
hi
did you activate the solidification or melting model?
did you define the melting or solidification tepreature and so on?
regards
ali
jafarizade is offline   Reply With Quote

Old   May 15, 2014, 04:41
Default
  #3
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Dear Al

Thank you for your response.

1. Have activated Solidification and Melting. This is by simply selecting this model, in the Models menu.

2. Can not see where I can define the melting & solidification temperature. Please explain how I can do this?

Thanks.
visitor is offline   Reply With Quote

Old   May 15, 2014, 05:12
Default
  #4
New Member
 
Ali Jafarizade
Join Date: May 2009
Posts: 22
Rep Power: 10
jafarizade is on a distinguished road
Hi visitor
in the material panel you can find the solidification and melting temperature and also the latent heat which is required for the melting or solidification
best regards
Ali
jafarizade is offline   Reply With Quote

Old   May 17, 2014, 00:01
Default
  #5
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Thank you for your reply.

I have entered 0C for solidification and melting, and 330kJ/kg for latent heat.

The ice layer is now formed, but almost constant at 0C. Where as the slab below the ice layer is at lower temperature, and the immediate air layer above ice is also lower.

Would expect the ice layer to be lower than just 0C, nothing changed, even when the slab temp was lowered further.

Thanks again for your clarifications.
visitor is offline   Reply With Quote

Old   May 17, 2014, 08:00
Default
  #6
New Member
 
Ali Jafarizade
Join Date: May 2009
Posts: 22
Rep Power: 10
jafarizade is on a distinguished road
HI VISITOR
would you post some detailed picture so that i can understand what is the difficulty?
thank you very much
best regards
Ali
jafarizade is offline   Reply With Quote

Old   May 18, 2014, 08:07
Default
  #7
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Dear friend

Thank you for your response.

Please see attached file. It is upside down, but can be corrected.

Ice temp appears fixed at 273K, while temps below ice layer and above, in the air layer, the temps are lower.

thanks
Attached Files
File Type: pdf ice form 15 May.pdf (39.9 KB, 30 views)
visitor is offline   Reply With Quote

Old   May 29, 2014, 01:21
Default setting intial starting body temperature
  #8
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Another Q?

I assume that setting up initial start body temperature condition is done through the cell zone>Operating conditions, and then choose a temperature, in this case the beginning concrete slab temperature.

Fluent will then start calculations and find the new starting temperature.

The Q; Is there another way of doing this?
visitor is offline   Reply With Quote

Old   June 4, 2014, 09:27
Default Got back to work, but now divergence !
  #9
Member
 
AH
Join Date: Apr 2014
Posts: 77
Rep Power: 5
visitor is on a distinguished road
Divergence has occurred because of temperature !

Will further lower URF to 0.6, & continue with k e- realizable - near wall treatment.

Hope this will work.

The solver actually run fine 80% through the transient simulation. But suddenly sharp diversion. This sudden divergence could be due to ice forming.

Will share with what ever I will come with, thanks.
visitor is offline   Reply With Quote

Old   November 18, 2017, 03:13
Default
  #10
New Member
 
Sajedeh
Join Date: Aug 2017
Posts: 6
Rep Power: 2
Sajedeh is on a distinguished road
Quote:
Originally Posted by jafarizade View Post
hi
did you activate the solidification or melting model?
did you define the melting or solidification tepreature and so on?
regards
ali
hi dear ali
I have similar problem, energy and melting is one; however, there is no melting temp option or latent heat in material panel. How can I fix this problem??
Sajedeh is offline   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
pure melting of ice due to water at higher temp ABH Fluent Multiphase 0 April 2, 2014 06:00
Mass imbalance problem in multiphase water and steam CFX case Antech CFX 0 February 19, 2014 06:46
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10


All times are GMT -4. The time now is 22:29.