# Heat Transfer Problem Help

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

 October 17, 2006, 23:22 Heat Transfer Problem Help #1 JB Guest   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. -Jason

 October 18, 2006, 01:53 Re: Heat Transfer Problem Help #2 Ryan Guest   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!! Regards Ryan

 October 18, 2006, 18:54 Re: Heat Transfer Problem Help #3 Pavan Guest   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. Pavan

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post MrStuebb FLUENT 11 March 27, 2016 11:41 Mohamed khamis CFX 1 January 16, 2010 00:12 B.Simon CFX 3 October 28, 2008 19:53 chakamal FLUENT 4 June 18, 2008 02:06 vipin CFX 2 July 18, 2006 10:05

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