CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Define vacuum conditions

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 29, 2015, 12:56
Default Define vacuum conditions
  #1
New Member
 
Cartuns11's Avatar
 
Join Date: May 2015
Location: Barcelona
Posts: 24
Rep Power: 11
Cartuns11 is on a distinguished road
Hi everybody,

I'm working on a radiation model using chtMultiRegionSimpleFoam (fvDOM). One region has to be vacuum, but I don't know how define it. This region is between two solids ( solid1_to_vacuum and solid2_to_vacuum), and the most important factor is the radiation has been emitted by solid1.

I don't know how introduce, in the region has been called "vacuum", the vacuum conditions or properties ( thermophisicalProperties, .....).

I thought that I could change thermal coefficients.......I changed it to 0....but it did not work.

could anyone help me?

Thanks!!
Cartuns11 is offline   Reply With Quote

Old   June 30, 2015, 03:47
Default
  #2
Senior Member
 
RodriguezFatz's Avatar
 
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27
RodriguezFatz will become famous soon enough
Without knowing much about your case: Did you try to set it to something really, really low but not zero? Such as 1e-10 ? Sometimes OpenFoam divides by these factors and you get a problem when setting it to "0".
__________________
The skeleton ran out of shampoo in the shower.
RodriguezFatz is offline   Reply With Quote

Old   July 2, 2015, 11:16
Unhappy
  #3
New Member
 
Join Date: Mar 2015
Location: Earth yet
Posts: 25
Rep Power: 11
coccone is on a distinguished road
I'm working on a chtMultiRegion case too and I am desperately trying to set up radiation modelling. I preferred to try first with viewFactor instead of fvDom for CPU purposes to no avail so far. In my case, as I have a huge mesh for a quite complex geometry I would not want an additional vacuum field to be calculated.

Since radiation is the only heat transfer through vacuum one would expect it to be possible...


Has anyone suggestions on how to proceed?

PS: I already checked this thread http://www.cfd-online.com/Forums/ope...ng-vacuum.html but I am not so skilled to modify the solver!
coccone is offline   Reply With Quote

Reply

Tags
fvdom, openfaom, radiation, vacuum

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
udf problem eb.nabizadeh Fluent UDF and Scheme Programming 2 March 1, 2013 01:28
How can I define these boundary conditions?!?!? adambarfi OpenFOAM 1 August 14, 2012 04:32
HELP,how to define the periodic boudary conditions using the icem mesh? dada1204 FLUENT 2 May 1, 2012 18:06
Free surface boudary conditions with SOLA-VOF Fan Main CFD Forum 10 September 9, 2006 13:24
Using UDF to define boundary conditions Forest FLUENT 3 April 22, 2005 18:58


All times are GMT -4. The time now is 10:42.