[BrainDebugger]

Hi

I am trying to simulate flow problem and use velocity field I get for problem
of moving finely dispersed particles in Star-CCM+.

I assume particles don't impact velocity field, so I don't need to recalculate it during particles movement modeling.

Velocity field modeling needs smaller time step and more calculation time for every iteration.

How can I calculate particles movement without recalculating velocity field?

[ping]

you mention time step so you have the unsteady solver enabled so if you really do have unsteady flow then the particle motion will also vary with each time step

but if you only want to see the particle motion at a particular time you can leave the lagrangian solver frozen until you are ready then freeze the flow solver and run one iteration of the lagrangian solver since this is all that is required - change back to the steady solver for this

and with the flow solver frozen you can run any number of lagrangian runs with different settings to see the effect of particle mass or size etc