CFD Online Logo CFD Online URL
Home > Forums > CFX

Help density dependence

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

LinkBack Thread Tools Display Modes
Old   November 11, 2003, 16:13
Default Help density dependence
Posts: n/a

I have a problem when solving for a flow inside a large tank. The dimension is 30 m in height, and a diameter of 20 m. The fluid is seawater. Temperature at the top of the tank is 279 K and at the bottom 276 K. There is a density different between top and bottom of 3 kg. Density top is 1024 kg/m3 and at the bottom it is 1027 kg/m3. Since the tank is 30 meters in height the is also the hydrostatic pressure.

I have define a fluid with the properties of water and a new density. The density and temperature field is set as initial conditions.

How should I set this correctly. It seems like I do not get a stabel solution the temperature field and density field is moving around

Thanks a lot in advance.



  Reply With Quote

Old   November 25, 2003, 21:30
Default Re: Help density dependence
Posts: n/a
You can open the expression editor , edit the function Density To Temperature and High(Pressure),Then select the Expr. button, the last type the name of the function Density to the temperature and the pressure
  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
A problem about density in liquid air definition alloveyou CFX 2 June 14, 2012 14:20
Variable Density Function ryzd FLUENT 1 August 25, 2011 14:16
REAL GAS UDF brian FLUENT 6 September 11, 2006 08:23
Warning 097- AB Siemens 6 November 15, 2004 05:41
variable density water Atit Koonsrisuk CFX 2 July 24, 2003 03:07

All times are GMT -4. The time now is 23:14.