[Zmur]

Hello!
I need to simulate how the boiler flue is being contaminated by soot particles.

I have a model of a boiler, where the hot gases (air and soot) travel through a pipe, which is inside a tank of water (this water then is used for heating). The length of the tube is 1m, diameter is 80mm. It has some obstackles inside it (made of sheet metal, size about 50mm), which are used to increase turbulence. The soot is sticking around them. We try to optimize the flow so that less cleaning is required.
Right now I can't make paticles to stick to wall. They only slide along it.

Some settings:
Particles:
Erosion Model Finnie (power factor = 2.0; Reference Velocity 1 ms)
No Particle rough wall model
One way coupling
Drag Force Schiller Naumann
Particle control settings:
max. part. integr. time step is 1e10[s]
Max tracking time is 20[s], Distance is 10[m], steps 100000

Flow:
Flow velocity is 5m/s (a pump is mounted at the air intake of the device), temperature is 300C.

Heat transfer is enabled. I use Heat transfer coefficient setting on the outer side of the tube. The water outside of the tube is about 70C.

Any information source on the problem would be helpful. Also, I think that I don't need tpo simulate particles precisely. It would be sufficient for me to see where they are gathering and\or sticking to a wall. If there is a way to do this without particle simulation, this may also help.