CFD Online Logo CFD Online URL
Home > Forums > Phoenics

natural convection in a air-cooled tower

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

LinkBack Thread Tools Display Modes
Old   May 17, 2004, 23:31
Default natural convection in a air-cooled tower
Posts: n/a
I want to know the velocity and pressure fields in the air-cooled tower, how should I set the model? I have simulated it in a closed domain, but the tower is too big, about 100m in height and 50m in radius. So it's impossible to make the mesh fine. If simulating it in an opening domain, how should I set the information of inlet and outlet?
  Reply With Quote

Old   May 18, 2004, 00:00
Default Re: natural convection in a air-cooled tower
leon mills
Posts: n/a
A couple of questoins to consider with a domain this size.

1) Can you use parsol : it lets you get better refinement out of you grid structure.

2) Can you make use of any symetry in the model and only look at half/quarter of the shape being investigated.

3) Look at adjusting the F Array to accept more cells. Look in POLIS for an example.

I frequently look at spaces this large and have no problems. Just rember that in a model that is 100m long then it is not likely that you are able to achieve 1mm accuracy. The same goes for pressures and velocities, the bigger the model, the bigger the cell, the less able the CFD is able to define flow in the domin.

Note: on some of the larger domain it can take 48hrs of run time on a pretty faster p4 for the model to converge.

Hope this helps,

  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
Natural Convection racheal FLUENT 8 September 28, 2009 08:41
natural convection adrian Main CFD Forum 3 March 10, 2006 01:17
natural convection rachid FLUENT 5 September 20, 2005 14:43
NATURAL CONVECTION ! S. Ferraris FLUENT 4 March 19, 2002 13:46
free convection heat transfer from a heated horizontal surface through a liquid to a thin cooled fin Kaushik FLUENT 1 May 8, 2000 06:47

All times are GMT -4. The time now is 01:09.