CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Natural Convection in a Vertical Confined Channel

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 11, 2024, 09:18
Default Natural Convection in a Vertical Confined Channel
New Member
Join Date: Jan 2024
Posts: 7
Rep Power: 2
CamsDR is on a distinguished road

I have the following problem that I have to analyse in ANSYS Fluent. I have to simulate the transient temperature field due to natural convection in a vertical confined channel. I have been provided with a geometry and mesh and I have to choose a viscous model, implement the boundary conditions and set up the transient analysis. I was provided with very little information as you can see in the attached file. To choose a viscous model I have to determine the Rayleigh number. To determine the Rayleigh number I need the characteristic length. I thought that the characteristic length in this case would be the distance that the air travels so the length from bottom to top (which is 1 meter). However, when I asked my supervisor, he told me that the length refers to the phenomenon so the pipe in vertical direction. I donít know what he means with this because the pipes have different diameters so I donít know which one I have to choose then for the characteristic length. Can someone help me what the best approach is here to determine the Rayleigh number and choose the best viscous model?

I was also given a temperature profile of the pipes over 120 seconds. I want to implement this in the boundary conditions but I donít know how. As I would prefer not to work with user defined functions, are there other options that I can use?

Thank you.
Attached Files
File Type: pdf HW19.pdf (147.7 KB, 5 views)
CamsDR is offline   Reply With Quote


natural convection, rayleigh number, transient 3d

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
natural convection along vertical plate Navid450 FLUENT 0 August 23, 2013 06:46
Natural convection flow over hot vertical plate M.sridhar FLUENT 8 June 6, 2011 08:46
Natural convection - Inlet boundary condition max91 CFX 1 July 29, 2008 20:28
Natural convection over a vertical wall mimi FLUENT 5 February 3, 2008 20:05
Natural convection in a vertical cylinder Virginie FLUENT 2 September 18, 2007 00:40

All times are GMT -4. The time now is 13:03.