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

Impact temperature on an aircraft

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 17, 2011, 12:01
Default Impact temperature on an aircraft
  #1
Member
 
Charles
Join Date: May 2011
Location: France
Posts: 78
Rep Power: 6
Santos-Dumont is on a distinguished road
Hi,

I would like to simulate the temperature of the surface of a flying aircraft. The main point of interest is the impact temperature on the leading edges to determine icing datas.
I didn't succeed in modeling it with Fluent. I used different models (Laminar, Spalart Allmart, k-Espilon) with a coupled solver but I get unsatisfying results.
The thing is quite disturbing because after like 20 iterations I get a result that looks pretty good with a higher temperature on the leading edges. But when I iterate more the aircraft surface temperature become constant except for some small hot and randomly located zones.
I activated the viscous heating, and I set the wall and the external temperature at the same value (240 K). The flow speed is 180 m/s and the air density 0.5 kg/m3.

What would you do to solve such a case in terms of model, boundary settings....? There is no tutorial that is about the impact temperature.
Santos-Dumont is offline   Reply With Quote

Old   August 17, 2011, 18:44
Default
  #2
Member
 
Charles
Join Date: May 2011
Location: France
Posts: 78
Rep Power: 6
Santos-Dumont is on a distinguished road
I made some extra tests on a simple cube but I get divergent results after 200 iterations, no matter which solver I chose.
Do somebody have some pieces of advice to share about this viscous heating on a wall ?
Santos-Dumont is offline   Reply With Quote

Old   August 18, 2011, 12:01
Default
  #3
Member
 
Charles
Join Date: May 2011
Location: France
Posts: 78
Rep Power: 6
Santos-Dumont is on a distinguished road
My test on the cube finally succeed with the Coupled k-epsilon solver.
Still, when I try it on the real geometry, I get the message "Time step reduced for xx cells" after like 200 iterations, and the residuals are diverging a few iterations later...

I read that it's due of sudden changes of temperature between iterations and that it could be caused by wrong solver setup...

Can someone help me out ?
Santos-Dumont 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
Problem with zeroGradient wall BC for temperature - Total temperature loss cboss OpenFOAM 10 March 5, 2015 07:57
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Bulk temperature Tf is obtained from total or static temperature? NPU_conanxie FLUENT 0 March 30, 2011 05:56
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07


All times are GMT -4. The time now is 04:31.