the problem is that when I use one-way and two-way coupling (no multiphase model just particle tracking dpm) the particles do not reach long distances after even 2000 time step and they are moving reasonably, but when I switch to ddpm, particles each very long distances so quilly (after 10 time step), so it seem that injection is alright. btw, I the residuals are not dropped sufficiently at each time step, could that be the reason?

BTW, how can I check particle/ flow time step?