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

Inlet & Outlet Boundaries causing low surface temp

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 18, 2004, 10:45
Default Inlet & Outlet Boundaries causing low surface temp
  #1
Ted Crilly
Guest
 
Posts: n/a
hi there,

i have a very simple model with some inlets and 1 outlet, the model is set to steady, high k/e, incompressible etc.

when i run a simulation it reaches steady state but upon inspecting the results there are very low temperature regions around the inlets and outlets,

in the boundary condition the supply temperature of the inlets are set to 291k, the outlet is split = 1 etc,

but the surface temperature plot shows a local min of about 130k ????

any ideas or help whats going wrong,

the model is built from geometry package then iges, prosurf and pro-am utilising trimmed mesh type.

tia - ted
  Reply With Quote

Old   November 18, 2004, 16:39
Default Re: Inlet & Outlet Boundaries causing low surface
  #2
Brian
Guest
 
Posts: n/a
Perhaps a residual erroneous initialization value? What is your initialization temperature? If you entered it in Celsius instead of Kelvin, you might see this sort of behaviour.
  Reply With Quote

Old   November 19, 2004, 09:58
Default Re: Inlet & Outlet Boundaries causing low surface
  #3
Ted Crilly
Guest
 
Posts: n/a
thanks brian,

it must have been that,

i double checked my initialisation temperature it was set to 293k, after re-running the problem the low temperature problem has been resolved

i guess my previous simulation must have had a low temperature initialisation, maybe i did setup the temp as 20k thinking it was 20degC etc

cheers

-ted
  Reply With Quote

Reply


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
Passing Average Temp from Outlet to Inlet Steve Scotts FLUENT 1 August 27, 2008 06:02
what meas bakflow in Pressure Outlet Boundaries? RAO FLUENT 1 November 24, 2005 04:01
High surface temp. oscillating flow UNAL FLUENT 0 November 19, 2004 10:20
Periodic boundaries at inlet and outlet? Michael Bo CFX 4 March 15, 2002 03:24
variable inlet boundaries Bengham Main CFD Forum 0 February 5, 2002 11:10


All times are GMT -4. The time now is 04:37.