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

Reference values

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 19, 2013, 07:12
Default Reference values
  #1
New Member
 
Vipin
Join Date: Jul 2013
Posts: 4
Rep Power: 4
vipingawande is on a distinguished road
Dear sir
I am calculating Average Nusselt Number in Fluent....

I am changing the reference value .....

what is the effect of reference value on solution?

How to set it with reference to a problem?

I am simulating 2D rectangular duct with Heat flux is given at middle of duct

inlet temp= 300 k

i am changing reference temp to some other values.....

help me.....
vipingawande is offline   Reply With Quote

Old   July 20, 2013, 12:46
Default
  #2
Senior Member
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 1,098
Rep Power: 19
flotus1 will become famous soon enoughflotus1 will become famous soon enough
The reference values in Fluent do not affect the solution. They are used for the calculation of dimensionless numbers.
flotus1 is offline   Reply With Quote

Old   July 20, 2013, 13:00
Default
  #3
New Member
 
Vipin
Join Date: Jul 2013
Posts: 4
Rep Power: 4
vipingawande is on a distinguished road
If I changed reference temp to get the required Nusselt Number ...is it a valid solution.
How to set reference temp for Nu no.?
vipingawande is offline   Reply With Quote

Old   July 22, 2013, 04:20
Default
  #4
Senior Member
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 1,098
Rep Power: 19
flotus1 will become famous soon enoughflotus1 will become famous soon enough
The reference values are those you would take if you calculated dimensionless numbers yourself.
You would not take 5m as a reference length to calculate the Reynolds number if the characteristic length of your flow setup was 1m.

I know nothing about your heat transfer setup, but I guess the correct reference value for the temperature is the free stream temperature at the inlet.

Or, since you obviously want to compare the results to another source, you should take the same temperature as in the reference work you are comparing to.
flotus1 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
swak4foam newbie29 OpenFOAM Installation 82 July 18, 2015 17:16
It would be wonderful if a tool for FoamToTecplot is available luckyluke OpenFOAM Post-Processing 165 November 27, 2012 07:54
Reference Values Lilly FLUENT 1 May 31, 2012 09:51
OpenFOAM 1.6-ext git installation on Ubuntu 11.10 x64 Attesz OpenFOAM Installation 45 January 13, 2012 13:38
Simulation of a single bubble with a VOF-method Suzzn CFX 18 October 2, 2009 04:18


All times are GMT -4. The time now is 10:07.