[afiefaldy]

Dear all,

I have a question regarding DPM BC settings in Recirculation Outlet, this is my project general descriptions:

1. I investigating particles' fates in an indoor flow simulation using Unsteady DPM, I'm using k- turbulent model. My model consists of a room, two occupants, and an indoor unit split Air Conditioner.



2. The fluid domain's boundary conditions are:
- Velocity Inlet at ceiling supply diffuser
- Mass flow inlet at 1/2 inch gap under the door (doorgap)
- Outflow at exhaust fan
- Recirculation inlet and recirculation outlet at the air conditioner unit

3. Flow time is 180 seconds, 40000 particles injected at t=1s.

My problem is:

At the end of simulation, about 1% of the particles escape through the recirculation outlet, which i don't desire. The problem is, in the recirculation outlet boundary condition window there is no DPM BC options.



Since i only desire the particles to escape through the exhaust fan, this condition becomes a big problem for me.

My question is:

Is there any way to specify "reflect" DPM boundary condition at the Recirculation Outlet so the particles won't escape through that zone?

I really wish someone can come up with the solution, will be very grateful. Wish you all a great day.

[Guvennergiz]

Hello Afief,
Unfortunately i couldnt see recirculation inlet-outlet boundary condition in R19 and about all other conditions i can set DPM settings like you desired.
Also, if an air cond. reflects particles that it already sucked, this could be create wrong particle flow too. So, maybe you can assume %1 particle escaping (or trapping because air conditioner units have filters too) and injecting back (that %1) from recirculation-inlet with single-injection.
I hope you can solve this problem.
Best regards,
Güven

[Jessica_Xu]

HI Afief,

I am also facing the same problem with Recirculation Outlet-DPM Boundary Conditions. If you have solved it, could you please give some suggestions about this issue?