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

Which thermal boundary condition?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 14, 2012, 04:37
Default Which thermal boundary condition?
  #1
New Member
 
Norger
Join Date: Oct 2011
Posts: 25
Rep Power: 14
norger is on a distinguished road
Hey,

my task is to simulate a body, e.g. a cylinder, which rotates with an angular velocity.
Also I have to regard the temperature of the cylinder and the fluid (air) around it.

My problem is the setting of the temperature. The cylinder should have a constant temperature of 400K and the air 293K and I want to know how the air influences the temperature of the rotating cylinder.

My solution:
I would use thermal conditions -> temperature but I donīt know whether this is right.
I donīt know furthermore what to write in the fields: wall thickness and heat generation rate.
I read that wall thickness should be zero but what about the heat generation rate and is my approach good or is it better to use heat flux?

Thank you for your efforts.
norger is offline   Reply With Quote

Old   May 15, 2012, 16:54
Default
  #2
New Member
 
unver
Join Date: Sep 2009
Posts: 10
Rep Power: 16
unver is on a distinguished road
Dear Norger;
If understood correctly, you have a cylindrical shell rotating in the air and needs to be at 400K.

First of all your physical problem must be represented in numerics as well in every detail needed. And Physically, you can only achieve this scenario by controlling the heat generation at every point separately. And this is impossible to realize. But if you wanna try it any way, I would solve the problem as a constant wall temperature first and obtain a wall heat flux. And then reverse the problem, and apply a heat generation profile on the surface. That should give the same or very close constant temperature distribution.
unver is offline   Reply With Quote

Reply

Tags
heat flux, heat generation rate, wall thickness

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Setting outlet Pressure boundary condition using CAFFA code Mukund Pondkule Main CFD Forum 0 March 16, 2011 04:23
Switching thermal boundary condition type symbolic FLUENT 1 April 1, 2010 06:25
how to set up a wall boundary condition according to calculated wall shear stress? gameoverli OpenFOAM Pre-Processing 1 May 21, 2009 09:28
Concentric tube heat exchanger (Air-Water) Young CFX 5 October 7, 2008 00:17
[Commercial meshers] Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Meshing & Mesh Conversion 2 July 15, 2005 05:15


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