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

speckled appearance in radiation

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 14, 2004, 06:38
Default speckled appearance in radiation
  #1
pi
Guest
 
Posts: n/a
Dear all, does anyone knows why the results for temperature look speckled after a radiation (montecarlo) simulation for a windowed room?. I´ve tried with different coarsening rates from 64 to 4 thinking it was the reason but the speckling remains. The length scale of the speckles is about 6 elements. The number of computed rays is 1e6.

any suggestion will be wellcome. Thanks

pi
  Reply With Quote

Old   June 16, 2004, 21:33
Default Re: speckled appearance in radiation
  #2
Juan Carlos
Guest
 
Posts: n/a
Dear Pi,

Your best bet here is to contact your support representative, and pass them your results file. Are you using 5.6 or 5.7? Multiband or Gray?

Good luck, Juan Carlos

  Reply With Quote

Old   June 17, 2004, 04:47
Default Re: speckled appearance in radiation
  #3
pi
Guest
 
Posts: n/a
Hi Juan Carlos, I´m still using 5.6 and two bands (0-2.5 and 2.5-1000 microns, solar and thermal bands). It´s suppossed I´ll see to my representative next week with more questions. I just thought that this problem was easy to solve and due to some mistake in the settings. Do you know if the MC radiation model is well tested in the 5.6 version?I can´t get either directionality in the results when I set a directional source of radiation.

Thanks a lot for your kind answers

pi
  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
natural convection problem with radiation jorien CFX 0 October 14, 2011 09:26
Surface incident radiation Pipiola FLUENT 0 August 11, 2009 15:46
Multiphase radiation in CFX Luk_Fiz CFX 5 March 17, 2009 03:51
Radiation: definitions visatron CFX 7 January 8, 2004 15:25
Fluent incident radiation problem Michael Schwarz Main CFD Forum 0 October 21, 1999 05:56


All times are GMT -4. The time now is 03:46.