|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Rasmus Vilsbøll
Join Date: May 2014
Posts: 1
Rep Power: 0 ![]() |
Hi guys.
I am running some cases on diffuse ceiling ventilation for my master's thesis. I run into some issues when changing flow rate: When changing from a relatively low flow rate (0.05 m3/s) to a higher (0.25 m3/s), having done a grid independency study, all variables suddenly become very unstable, and convergence will never occur. My monitor points are also very unstable. Maybe the problem is related to the following issue: I have a fixed flow on my inlet. In the room I have heat sources simulating the presence of people. How should I define my outlet? I have the following options: - Fixed flow outlet (if there is a density change, which there is, I don't conserve mass) - Fan (I can define a stagnation pressure, which I understand as the pressure on the fan at which the fan stops?) At low flow rate this type of outlet is the only ensuring mass balance. - Perforated plate Currently I have fans installed. I'm a little new to CFD so my apologies if the answers to my questions are obvious ![]() Thanks! |
|
![]() |
![]() |
![]() |
Tags |
flovent, instability |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
FloVENT for new user | ar1001 | FloEFD, FloWorks & FloTHERM | 0 | April 21, 2011 14:04 |
Flovent meshing - structured cartesian okay? | Josh Kjenner | Main CFD Forum | 1 | January 11, 2008 23:06 |
Instability at the onset of natural convection | Magherbi | Main CFD Forum | 0 | October 23, 2002 09:53 |
Instability of convection | Zeng | Main CFD Forum | 0 | May 26, 2000 05:39 |
secondary instability?? | Anan | Main CFD Forum | 2 | April 6, 2000 09:48 |