After enabling the beta feature access (Introduction), you can use the non-iterative time-advancement (NITA) scheme for your DPM transient flow calculations in order to increase the speed and efficiency of your simulation. The NITA solver is recommended for problems that use small time steps (the Courant number is below unity everywhere in the domain). For background information about the non-iterative time-advancement scheme, see the Fluent Theory Guide.

Details about using the NITA option are described in the section on setting solution controls for the non-iterative solver in the Fluent User’s Guide. When using NITA, you should keep the time steps sufficiently small so that the Courant number remains below unity everywhere.

Note that when the Non-Iterative Time-Advancement option is selected in the Solution Methods task page, the Update DPM Sources Every Flow Iteration option becomes unavailable in the Discrete Phase Model dialog box.