# Risen residuals

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

February 28, 2013, 03:03
Risen residuals
#1
New Member

Join Date: Feb 2013
Posts: 18
Rep Power: 4
Hi everybody,
I'm simulating natural ventilation in building, through the attached model.
I've imposed a velocity inlet on the front face of the parallelepiped, representing the air outdoor the building, and outlet pressure on its back face. Then the other face are set as simmetry, except the basis, which is a rough wall.
I want to evaluate the pressure coefficient on the building walls and the ventilation rate through the window on the frontal face of the building.
Now, the problem are two.
1. How to calculate The ventilation rate through the window, since I've tried with "Volume flow rate" as surface integral on the window face, but this value oscillates between negative and positive values during iterations. So, how could I calculate it (m3/s)?
2. After a first phase when residuals go down and seem to establish constant, a second phase starts, when residuals rise. I've monitored also the static pressure on the inlet face which seems to be quite constant, oscillating beetween -0.94 and -0.9 pascal.
What could be the reason?
Thanks a lot
Attached Images
 Dominio.jpg (58.1 KB, 4 views) residuals.jpg (96.8 KB, 8 views)

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Zigainer FLUENT 16 April 14, 2015 23:17 franzdrs FLUENT 5 March 21, 2013 04:59 MachZero Main CFD Forum 7 December 25, 2012 13:18 Pat84 FLUENT 0 October 22, 2012 15:59 HS FLUENT 1 November 7, 2005 06:45

All times are GMT -4. The time now is 22:25.