Solid particles not influenced by airflow
 

Hi,
I'm having trouble with particle tracking.
The solid particles are not influenced by the fluid they are in (Air at 25c). Even though they are Fully coupled with the air.
The particles only change direction when hitting a wall.
Has anyone seen this before?
Thanks!

To clarify my problem:

The airflow which acts like it should:
http://s17.postimg.org/pig6lml0v/flow.jpg

And the particles, which just go straight ahead:
http://s17.postimg.org/so0sbu3n3/particles.jpg

Could be lots of things.

Are the material properties correct?
Is the interphase drag set correctly?
Is the particle integration time step set correctly?
Is the simulation converged?

I check if they converged, but I was stupid enough to leave the maximum amount of iterations at 100.
After increasing the number, they still don't seem to converge.
Does this per se mean that the particles won't interact with the flow?
This is from the box posted above:
http://s7.postimg.org/9mh282nkr/CFX2.jpg

And the butterfly valve tutorial:
http://s24.postimg.org/cojljijyt/CFX.jpg

THis question is an FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Don't pay too much attention to the convergence history of the tutorials. They show you how to set a simulation up, but they do not show you how to do an accurate simulation. THe results the tutorials give are not very accurate.

But don't worry about the convergence for now, you have a more fundamental problem if the particles travel in straight lines. The points I raise in my previous post are a starting point in what to check.