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

Surface Nusselt Number tooooo high

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 29, 2011, 02:46
Default Surface Nusselt Number tooooo high
  #1
New Member
 
Kamran
Join Date: Nov 2010
Posts: 8
Rep Power: 6
kamran651 is on a distinguished road
Hi brothers,
I have designed a 1m length rectangular 2D cylinder-type model with. the inlet is 0.125 m on the top, and the flow is in the -Y direction and moving along the x direction after impinging on the wall below..my question is i want to study the heat transfer and Surface Nusselt Number on the impinging wall, i am using 2ddp realizable k-e model and set all the values correctly..my concern is
>>> the Surface nusselt number on the impinging wall is coming out to be in the range of 5000, whereas as previous studies or comparison, it should come out to be between 120-150.
anyone has any idea.where i am going wrong.???
Help highly appreciated

bets Regards.
kamran651 is offline   Reply With Quote

Old   January 9, 2012, 02:14
Exclamation
  #2
New Member
 
Join Date: Jan 2012
Posts: 1
Rep Power: 0
CFDaniel is on a distinguished road
Hi,

As far as I know, try to change the reference values given in the reference values menu. It doesnt need to start the simulation again. Those values only work for postprocessing.

You may take:

D as your hydraulic diameter
T as your reference pressure

Check it

I hope you find the solution. Be careful with those values you choose, because they can change considerably Nusselt values.
CFDaniel is offline   Reply With Quote

Old   January 9, 2012, 06:40
Thumbs up Thanks Bro...
  #3
New Member
 
Kamran
Join Date: Nov 2010
Posts: 8
Rep Power: 6
kamran651 is on a distinguished road
Yes you are right..i was not setting the reference values correctly which are used for post processing..i figured that out...

Thanks Bro
Kamran.
kamran651 is offline   Reply With Quote

Reply

Tags
fluent, meshing, simulation, surface nusselt number

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
Number of cells in mesh don't match with size of cellLevel colinB OpenFOAM Native Meshers: snappyHexMesh and Others 11 January 13, 2015 12:47
Nusselt number variation over a ribbed surface avi031 FLUENT 2 March 10, 2011 13:09
Airfoil Average Nusselt Number calculation y2k_o__o FLUENT 6 March 3, 2011 08:37
snappyHexMesh aborting Tobi OpenFOAM Native Meshers: snappyHexMesh and Others 0 November 10, 2010 04:23
Nusselt Number of the order of 35000 chinmay FLUENT 4 May 31, 2001 03:06


All times are GMT -4. The time now is 01:12.