Reply To: FIBERS DISAPPEARED IN ROCKY

[Jackson Gomes]

Hi ivan.beltracch.

The DEM time step size can significantly impact simulation stability. If the DEM time step is too large, it may cause divergence issues, especially when calculating drag forces on particles. Adjusting the Rocky time step and maintaining a controlled ratio with the Fluent time step can help prevent force calculation errors and improve simulation accuracy. To achieve precise results in complex interactions, such as particles being dragged by concrete flow, optimizing the CFD mesh resolution and employing semi-resolved model can improve simulation fidelity for particle behavior under flow conditions​. 

Double-check the domain bounds to make sure it is correct defined.

Best regards.