CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Negative Heat Transfer Coefficients

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

LinkBack Thread Tools Display Modes
Old   May 24, 2010, 19:20
Default Negative Heat Transfer Coefficients
New Member
Join Date: May 2010
Posts: 1
Rep Power: 0
Archangel2424 is on a distinguished road
Hi all,

I am modeling air flow over a vehicle. Some portions of the mesh such as tires, controllers, and motors are generating heat so I have boundary conditions at steady state temperature operation. When it appears my system has converged, I am seeing some areas of negative heat transfer coefficient. They are patchy at best but concentrated in symmetry on both sides. Can someone help me with this?
Archangel2424 is offline   Reply With Quote

Old   May 27, 2010, 17:19
Default Re
New Member
Yugo Wen
Join Date: May 2010
Posts: 3
Rep Power: 9
yugo_wen is on a distinguished road

The reason you got negative h may be is that your reference temperature is set too high. So check your reference temperature.

If the heat is from the surrounding to the surface meaning that the surface is cold, then h is negative.

Hope this is helpful...
yugo_wen is offline   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
BlockMesh FOAM warning gaottino OpenFOAM Native Meshers: blockMesh 7 July 19, 2010 14:11
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 23:53
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00
negative heat transfer coefficient Sigrid Andreae CFX 1 February 26, 2005 08:13
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55

All times are GMT -4. The time now is 03:23.