CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Heat Transfer Problem Help

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

LinkBack Thread Tools Display Modes
Old   October 17, 2006, 23:22
Default Heat Transfer Problem Help
Posts: n/a
I am trying to set up a simple heat transfer problem and am running into problems and need some help. I am trying to create a simple cylinder and apply a heat flux to the top of the cylinder. I then want to look at the temp. gradiant and I expect to see something along the lines of higher temps. closer to the top with the temperatures getting lower as you move down the cylindrical plate.

I have no problem creating the geometry and meshing the plate. Where i think i am running into problems is boundary conditions or maybe setting the problem up in Fluent. Here is what I did:

I created boundary conditions of "wall" along all the edges: top, side, and bottom. I also specified the continum type as a solid.

Exported the mesh and can bring into Fluent with no problems. I turn on the energy equation in the define models. At the top wall boundary conditions I apply Heat flux, wall thickness, and heat generation rate. Set up to solve and it will iterate until convergence. Problem I have is when i look at the temp. gradiant there is uniform temperature throughout the piece. So something is not right and I could use some help.

Thanks in advance.


  Reply With Quote

Old   October 18, 2006, 01:53
Default Re: Heat Transfer Problem Help
Posts: n/a
Hi Jason,

If it is a cylinder and you are modelling the flow around it. There is no need to create a solid zone.

Create a big cylinder around your smaller one representing the fluid domain.

Subtract the smaller cylinder from the bigger one.

The surfaces representing the smaller cylinder just subtracted will be your region of interest.

Set up as normal you have done until now.

When you say uniform temperature through out the piece do you mean along the vertical cross section of the cylinder.

You need to have boundary layer as well to pick up the minute changes.

Good luck!!



  Reply With Quote

Old   October 18, 2006, 18:54
Default Re: Heat Transfer Problem Help
Posts: n/a
I am not sure if I get you right but what I've read it looks to me like you are solving the problem as a steady state problem and if you are then what you are seeing makes sense. If you solve it as unsteady or time-dependent problem, then you would see a variation in the temperature gradient with time. I hope this solution helps and makes sense to you.

  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
Heat transfer problem at nucleate boiling MrStuebb FLUENT 10 December 18, 2014 15:35
Wall heat transfer coefficient (HTC) problem Mohamed khamis CFX 1 January 16, 2010 00:12
How can I increase Heat Transfer at Domain Interf? B.Simon CFX 3 October 28, 2008 19:53
heat transfer problem chakamal FLUENT 4 June 18, 2008 02:06
heat transfer problem. vipin CFX 2 July 18, 2006 10:05

All times are GMT -4. The time now is 16:45.