Track after particle hit the wall.
 

Hi everybody.

I’m doing a steady state simulation with Ansys CFX and using particle transport modeling. I have a problem with the particle track. The track ends a short time before the particle hits an inclined wall (the boundary of the mesh). The wall has a free slip condition.
I want to follow the particle displacement after the impact.

How can I solve this problem?

Thank you!

http://imageshack.us/photo/my-images/809/bpdk.png/

There are many reasons a particle track can terminate - exceed time, distance, integration steps, minimum displacement increment. Have you checked which reason caused this particle track to terminate?

Thank you for your answer,

I don’t know the reason why particle track terminate. In fact, some tracks arrive to the wall and go out across the outlet, and other tracks don’t. This last tracks ends a short time before the particle hits the wall.

I realize the track distance varies according to the residuals. If I stop the solver at 1E-3 I can see a short track across the wall. If I stop the solver at 1E-4 or 1E-5, the problem come back.

Thank you again.

Solved!
The problem was the solver control.

Thanks!

I trust you are not proposing using a very loose residuals convergence critereon is the "solution" to your problem....

Of course not. My residual convergence criterion is 1E-5…
I changed some parameters of the particle control to solve the problem.

Thanks anyway

I am pleased to hear that, very good.

Which parameters were causing the termination before reaching the wall?
I am having similar problems in a transient simulation.

I increased max. tracking time and max. tracking distance at particle termination control.

I will try that, thanks!