|
[Sponsors] |
October 4, 2014, 06:52 |
suction boundary condition
|
#1 |
Senior Member
|
Hi,
I would like to simulate the air ventilation system with a filter enclosed within a box. One side of the box has multiple inlets through which the air is coming in and the outlet is a filter surface. So i would like to impose atmopheric conditions on the inlet like pressure and temperature, velocity is not known. For the outlet i would like to use the filter surface as suction boundary condition using the give volumteric flow rate. So just for the first try i use the inlet as fixed values and the outlet as flowvelocityinlet with a negative volumetric flow rate. But i get convergence problem. Finally i would like to compare to the mass flux over the inlet and the outlet that should almost be the same. If someone knows about any appropriate boundary condition or other tips, please let me know about that. Thanks in advance. |
|
October 4, 2014, 16:59 |
|
#2 |
Senior Member
Joachim Herb
Join Date: Sep 2010
Posts: 650
Rep Power: 21 |
You could use the fixedMean boundary condition for the (outward) velocity at the outlet.
|
|
May 27, 2015, 10:40 |
Similar case, but perhaps compressible
|
#3 | |
Member
Pierluigi Cirrottola
Join Date: Jun 2013
Posts: 52
Rep Power: 12 |
Quote:
I'm beginning to work around a similar case: my medical device is very small, but I have, like you, two small inlet (2.5mm dia) and one bigger outlet, (12mm dia). By a previous fast analysis, I found that max speed could be about 0.4 Mach, so I would like to study it using some compressible solver. In my mind (for a stationary run) two small inlets should have a BC based only on atmospheric pressure, while outlet should have a BC based on a known Negative Volumetric Flow Rate. Can you suggest how to assign boundary conditions ? Many thanks ... piero |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
An error has occurred in cfx5solve: | volo87 | CFX | 5 | June 14, 2013 17:44 |
Low Mixing time Problem | Mavier | CFX | 5 | April 29, 2013 00:00 |
Velocity profile boundary condition | Tuca | FLOW-3D | 1 | April 23, 2013 12:02 |
Velocity boundary condition: negative value (suction) | val46 | OpenFOAM | 5 | May 8, 2012 23:40 |
suction boundary condition for a synthetic jet | morteza08 | FLUENT | 0 | August 18, 2010 07:48 |