CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

CFX-5.5 simulating air free convection

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 16, 2003, 02:54
Default CFX-5.5 simulating air free convection
  #1
Dustin Lee
Guest
 
Posts: n/a
Dear all, I'm working on CFX-5.5 to simulate the air free convection in solar heated spaces. I really appreciate if anyone give me some suggestions to solve the following problems. First, The "Global length", shown in the Out File, is used to calculate Rayleigh number but that value is not fit with the equivalent vertical length (i.e. actual heated space length times Sinúc, úcis the inclined angle of the heated space). So I'd like to know how to calculate the "Global length" in CFX-5.5? Secondly, Is it reasonable to use k-epsilon turbulence model & Scalable turbulence wall function to calculate the heat transfer coefficient of the turbulent free convection flow (i.e. Rayleigh number is larger than 1.0E+09). Is it a possible to input the empirical correlation to calculate the heat transfer coefficient of the turbulent free convection flow? I'd like to know the better approach of turbulent models to simulate the heat transfer coefficient in free convection. Finally, In CFX-Post, the temperature distribution plotted over the Global range option are obviously lower than those values plotted over Local range option. In general, which one option will be used to evaluate the mass and energy conservation in solar heated spaces?
  Reply With Quote

Reply

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
CFX Natural Convection, please help. dbecker CFX 5 October 13, 2010 19:07
how to set the parameters in simulating the natural convection hook FLUENT 1 January 17, 2010 02:33
Natural convection. Air properties Cristina FLUENT 3 March 24, 2007 09:23
Simulating air jet into 2D & 3D water domain Imran FLUENT 0 June 6, 2006 08:57
Free convection flow over vertical flat plate Polly Main CFD Forum 1 February 11, 2003 14:25


All times are GMT -4. The time now is 09:24.