Unfinished particle tracks in simpleReactingParcelFoam
 

Dear all,

I am simulating a turbulent air flow with sand particles of multiple sizes. The particles are expected to either reach the so-called "Killing_Wall" or the Outlet of my domain. As my situation is steady-state, I am using simpleReactingParcelFoam of OF 2.3.1.

Below is the output I get after each particle tracking. I can read that 3343 parcels have reached the Killing_Wall and 5967 have reached the outlet, but 690 parcels got stuck anywhere in the domain. With paraFoam I can see that my maxTrackTime criteria was hit only for two of them. All the other tracks out of these 690 look nice so far, but stop suddenly somewhere in the middle of the flow field.

So I wonder what could have been happened to them and how to avoid such a high failure rate.

hello, conerlia, have you solve the problem? I have the same problem as you mentioned, I took simpleFoam solver to inject liquid particles(looked as solid particles). but I have more questions:

1. the gravity seems doesn't act on the particles, even I set the gravity.

2. the paritcles will flow along the wall for a distance after it hit the wall.

3. There are a lot of particles stuck in the flow doamin, not stick to the wall and not to get to the outlet. That may be the calculation doesn't coverge. I also prelong the maxtracktime, but if I do that, I found all the particles will stuck in the doamin, no sticking the wall and no getting to the outlet.

Hi luchen2408,

thank you for your answer. But unfortunately I did not solve my problem. My simulation works fine apart from the unfinished tracks. In my case the problem does not only appear next to the wall, but some particles also vanish in the middle of the domain without any obvious reason.

Gravity is working correctly in simpleReactingParcelFoam. If you compiled your own version of simpleFoam (as the standard simpleFoam does not support particle tracking), the error is most probably in your code.


Best regards
Cornelia

hello, conerlia, Thanks for your reply. In my simulation, I took swak4foam to introduce the particles. it is easier to compile a new solver. I will check the code once again. Thanks.