|
[Sponsors] |
May 7, 2012, 04:00 |
outflow boundary condition
|
#1 |
Senior Member
Join Date: Feb 2011
Posts: 140
Rep Power: 15 |
Dear all,
I want to simulate a contrast agent bolus in blood inside a vessel using the "mixture model", but since the amount of contrast agent is really small I picked the same properties for both materials. I was suggested to use a "velocity inlet" and an "outflow outlet" (since I have some bifurcations I thought this would be a good outlet boundary condition). But I read in another thread and at the FLUENT manual that i am not allow to use the outflow bc with "multiphase models (Eulerian, mixture, and VOF..." Therefore I am confused whether I am allowed to use "outflow" since I am using the "mixture model", but I don't have different phases of my fluids. Thank you for all your help and ideas! Lilly |
|
May 7, 2012, 04:54 |
|
#2 |
Senior Member
Join Date: Mar 2009
Location: Indiana, US
Posts: 186
Rep Power: 17 |
An outflow can be used with the Mixture model. But if you have multiple outlets, and you want to use the outflow then you need to input the mass flow distribution between individual outlets
Regards Luke |
|
May 7, 2012, 08:26 |
|
#3 |
Senior Member
Join Date: Feb 2011
Posts: 140
Rep Power: 15 |
Thank you Luke!
Do you mean that I have to consider that the flow rates of the single outlets adds up to 1? And for which exceptions am I allowed to use "outflow" at using "mixture model" (just because it was written in the FLUENT manual that I am not allowed to use it). |
|
May 8, 2012, 03:12 |
|
#4 |
Senior Member
Join Date: Mar 2009
Location: Indiana, US
Posts: 186
Rep Power: 17 |
Do you mean that I have to consider that the flow rates of the single outlets adds up to 1?
Yes, if you activate the "outflow BC" you will notice a flow rate weighting. The weightings of all outlets should add up to 1 And for which exceptions am I allowed to use "outflow" at using "mixture model" (just because it was written in the FLUENT manual that I am not allowed to use it). I would assume you cannot use the Outflow BC if you are modeling cavitation or some sort of mass transfer between phases. Regards Luke |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
External Radiation Boundary Condition for Grid Interface | CFD XUE | FLUENT | 0 | July 9, 2010 02:53 |
vorticity boundary condition | bearcharge | Main CFD Forum | 0 | May 14, 2010 11:32 |
Outflow boundary condition in FLUENT | Sri | FLUENT | 5 | December 5, 2003 04:42 |
Supersonic Outflow Boundary Condition | asif | FLUENT | 1 | July 26, 2003 11:30 |