[hwet]

If interaction with continuous phase is not important and is not modeled, does having parcels or a certain number of particles even important?

Also, what if unsteady tracking of particles is not turned on, what is the time step used for the integration of particle equations then? I couldn't find this in the manuals.

[`e`]

Originally Posted by hwet

If interaction with continuous phase is not important and is not modeled, does having parcels or a certain number of particles even important?

No. Only intrinsic properties (such as particle density) and particle diameter (for drag laws, buoyancy etc) are important in one-way coupled Euler-Lagrangian systems. Each parcel is represented by an effective particle and carries a mass flow rate.

Originally Posted by hwet

Also, what if unsteady tracking of particles is not turned on, what is the time step used for the integration of particle equations then? I couldn't find this in the manuals.

If unsteady tracking of particles is not turned on, then you're using steady tracking. Fluent chooses a time step and then refines this step to achieve a set tolerance (default of 1E-5). You can modify the DPM time step via the DEFINE_DPM_TIMESTEP macro.