CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Stream is sticking to the wall

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

LinkBack Thread Tools Display Modes
Old   October 18, 2013, 06:38
Default Stream is sticking to the wall
New Member
Join Date: Oct 2013
Posts: 7
Rep Power: 5
pawel123 is on a distinguished road
Sponsored Links
I have a problem with swirl coal burners calculations. Burner design provides 3 air steams. Main air stream is swirled.

I am using steady state.
I have tried various methods to converge these burners:
- different mesh (coarse, fine, with cells directed along and across the stream, with and without boundary layer)
- with and without: energy, combustion
- calculations start with all 3 streams, calculations start with 1 stream and after obtain convergent swirl stream I added second one and third one.
- different wall functions for k-epsilon
- another turbulence models like: RSM
- first order/ second order discretization methods, and pseudo transient options.
Unfortunately, results are almost always the same.
At the beginning streams are formed (Fig. 1)

Later stream starts to oscillate (Fig. 2)
At the end stream is sticking to the wall (Fig. 3)
I am also attaching animated .gif file (simulation inside combustion chamber) -

If you have and ideas how to fix this problem, or what should I check, please help.

Best regards,
Attached Images
File Type: jpg fig3.jpg (42.9 KB, 7 views)
File Type: jpg fig2.jpg (47.1 KB, 6 views)
File Type: jpg fig1.jpg (46.6 KB, 6 views)
pawel123 is offline   Reply With Quote
Sponsored Links


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
Enhanced Wall Treatment paduchev FLUENT 21 August 14, 2017 00:54
Conjugate Heat Transfer: Wall Heat Flux at Coupled Walls? MaxHeat FLUENT 3 April 21, 2013 18:22
Free stream temperature in tube wall saharesobh FLUENT 2 November 19, 2012 08:32
Free Stream & Wall Temp UDF jww FLUENT 0 October 2, 2009 09:37
Quick Question - Wall Function D.Tandra Main CFD Forum 2 March 16, 2004 05:29

Sponsored Links

All times are GMT -4. The time now is 22:31.