CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Buoyancy Driven Flow - HELP!

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

LinkBack Thread Tools Display Modes
Old   October 8, 2007, 03:16
Default Buoyancy Driven Flow - HELP!
Posts: n/a

I have been modeling steady state vehicle aerodynamics for a few years now and I am faced with a simple problem yet I can't seem to get a solution, can anybody help me?

I have a land rover and a livestock trailer. In most of my simulations of turbulent flow, air flows through a duct surrounding the vehicles and that is simple enough. However, I want to look at a flow speed of zero.

There are CAD models of animals which I have inside the livestock trailer and they produce heat. I just want to model the temperature gradients inside the trailer. I have followed the help in Fluent and changed the boundary conditions of the duct I used for airflow calculations. So now, all the external boundaries are pressure outlets at asmospheric pressure and the vehicles and animals are walls. However, the solution always diverges.

What am I doing wrong!?! Can anybody give me a simple overview of the steps required to model this type of flow? Thank you for your time. Best regards,

  Reply With Quote

Old   October 8, 2007, 17:10
Default Re: Buoyancy Driven Flow - HELP!
red lemon
Posts: n/a
Use body force weighted for pressure, gravity enabled, ideal gas and ensure boundaries are far enough away from heat source
  Reply With Quote

Old   October 11, 2007, 02:35
Default Re: Buoyancy Driven Flow - HELP!
Rameche Candane
Posts: n/a
Are you specifying isothermal wall as BC for the livestocks or u treat them as conjugate heat transfering sources with volumetric heat generation. I agree with red melon you need to specify the gravity as -9.81m/s2, and enable ideal gas assumption. Its not a must to have the boundary quite far away as u r specifying pressure BC.
  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
Flow meter Design CD adapco Group Marketing Siemens 3 June 21, 2011 08:33
is there any parallel code for the famous Lid Driven Cavity flow? gholamghar Main CFD Forum 0 August 1, 2010 01:55
2D Lid Driven Cavity Flow simulation using MATLAB josephlm Main CFD Forum 3 June 24, 2010 01:58
steam flow in a pipe driven by a pressure gradient between inlet and outlet SalvoCalvo Main CFD Forum 0 March 11, 2010 07:52
Inviscid Drag at subsonic, subcritical Mach # Axel Rohde Main CFD Forum 1 November 19, 2001 13:19

All times are GMT -4. The time now is 11:08.