[bbmorales]

Hi there.

I am running a gas-solid euler-euler transient simulation in Fluent 14.
I am using the granular model. The transient formulation is the first order implicit.

I would like to use adaptive timesteps, but I cannot select it under the Time Stepping Method scroll list. It only has the fixed time step option available.

How can I do it?

I have found the following info in the manual:

Important:
Adaptive time stepping is available only with the pressure-based and density-based implicit formulations; it cannot be used with the density-based explicit formulation. In addition, it cannot be used with the discrete phase model, second-order time integration, Euler-Euler multiphase models (Approaches to Multiphase Modeling in the Theory Guide), or user-defined scalars (User-Defined Scalar (UDS) Transport Equations).

Is there any way that I can set an UDF or something to adapt the time step?

Regards!