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[Fluent] DPM Time Step Independent Study

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Old   October 9, 2019, 21:05
Default [Fluent] DPM Time Step Independent Study
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I have transient laminar flow and I use DPM to inject particles inside the flow. I assigned a trap boundary condition for a wall and the particles are supposed to hit the wall and consider trapped particles.
The strange thing that happens is that whenever I decrease the time step of the fluid flow, the number of particles sticking to the wall decrease.
This happens when in all time steps (below 0.3s) distribution of the velocity and pressure don't change anymore or in other words, the fluid flow becomes independent of the time step.
I would be highly appreciated if anyone can help me to know why particle flow can not become independent of the time step.
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