Hi Andre,

There is indeed a difference in solution accuracy between the two.
With FillPack Mode = 1, Fill and Pack are solved separately. In most cases, the flow behavior during the Pack stage is already almost negligible, so the focus is on pressure transmission. Since the packing time is usually much longer, enlarging the time step will not significantly affect the results.

With FillPack Mode = 2, the Pack stage continues to be solved with the high time resolution of the Flow stage, which makes the analysis time longer. Therefore, this mode is only used when focusing on detailed analysis.

If you have specific requirements, please let us know and we can provide recommendations based on your case. Thank you.