CFD Online Logo CFD Online URL
Home > Forums > FLUENT

S2S model

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

LinkBack Thread Tools Display Modes
Old   September 16, 2008, 02:48
Default S2S model
Posts: n/a
hello sir,

i have some problems about radiation modelling in S2S:

here is some description of problem :: square 2D cavity bottom hot top cold side walls adiabatic

i am using S2s model but i see that it is not giving correct results for the low emissivities bottom 0.5 and side walls 0.1

Radiation Heat Transfer Rate (w) -------------------------------- --------------------

bottom 0.22598088

left 0.00022241924

right 0.00030250785

top 0.12082574

---------------- --------------------

Net 0.34733155

but it gives accurate results if i keep e=1 for all (for checking this i have kept gravity=0 and k =0 for air so that i get only radiative heat transfer)

one more absurd thing is that if i keep one of the top or bottom e=0 it gives like :

Radiation Heat Transfer Rate (w) -------------------------------- --------------------

bottom 0

left 0.00020713897

right 0.00024958443

top 0.017235142

---------------- --------------------

Net 0.017691865

which actually should be close to 0.

this is what i find problematic

maximum iterations exceeded in radiation calculations. Radiosity unconverged after 5 iterations Final radiosity residual = 2.983e-003

can you please guide me regarding this ?

(emissivity i give in the internal emissivity)

waiting for reply

  Reply With Quote


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
Population balance model for twofluid model pierre OpenFOAM Running, Solving & CFD 9 March 19, 2016 14:46
Surface Reaction Model or Heterogeneous Rxn Model? satheeskannan FLUENT 0 September 2, 2008 18:55
changing model constants in k-e turbulence model Sunil CFX 3 October 3, 2006 12:12
Symmetry model half or total geometrical model in LES vvqf OpenFOAM Pre-Processing 3 March 22, 2006 10:06
Copying boundary conditions from model to model Lior FLUENT 3 September 23, 2004 16:10

All times are GMT -4. The time now is 16:19.