Besides analyzing the packing phase of the injection molding process, the Flow analyses support additional simulation features. 
- Core shift prediction 
-  If the effect of core is taken into consideration when analyzing a part, a Pack analysis can be used to predict the deflection of the core, and the resultant changes in thickness and performance of the part. 
- 2-Shot Sequential Overmolding 
- If your part is produced in a 2-shot Sequential Overmolding process, a Fill+Pack analysis can simulate the filling and packing of the first component followed by the filling and packing of the overmolded component.