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

Pressure & Air circulation

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

LinkBack Thread Tools Search this Thread Display Modes
Old   October 16, 2010, 10:38
Default Pressure & Air circulation
New Member
Noppawit Sippawit
Join Date: Oct 2010
Posts: 14
Rep Power: 11
noppawit is on a distinguished road
I'm a beginner in CFD, please advise me.

I've a container model with a cavity. The air is inside that closed cavity. I set the model to be heated up for more that 100 degree C, solve for transient from 0-15 sec, 0.1 sec is my time step size. The outer surface of the container is radiate to ambient air 300K.

I need the temperature, pressure and velocity of air in the cavity.
For temperature, I've already checked with my adviser and it is reasonable. But for pressure and velocity, the result are not reasonable. Because when I heat it up, pressure should increase, but my result is not increase. And, no air circulation in the cavity. The results are all converged, but I don't understand why FLUENT says "Converge", since some of residual plotted (Velocity) is not below 1e-06.

In this case, how can I set the FLUENT? From what I set, I included gravity, with initial gauge pressure is 1e-10Pa, initial velocity in x,y,z was 1e-10m/s. And I also set the flow to be laminar flow (I've no idea about choosing another turbulent model), and energy equation was set to be on. All Spatial Discretizations were Second order.

In my opinion, the pressure should be increased within the cavity, since the concept is similar to Marcet boiler.

Please help,
Thank you
noppawit is offline   Reply With Quote


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
Pressure boundary conditions hiras FLUENT 22 July 27, 2015 01:38
Fluent natural ventilation pressure boundary condition pierresandre FLUENT 24 November 8, 2011 14:32
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
UDF to define or adjust pressure??? engahmed FLUENT 0 July 6, 2010 17:19
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 15:00

All times are GMT -4. The time now is 05:08.