The direction of gravity is an optional analysis input that you can specify for a 3D Fill+Pack analysis. This allows you to investigate the effects of gravity on the injection molding process for your part.
Note: Gravity direction is available only if you are using the Navier Stokes numerical solver. The Navier Stokes solver takes flow inertia effects into account.
Gravity direction considerations
When molding thin walled parts, viscosity is usually low and flow of polymer is fast into the mold cavity. Therefore, the effect of gravity on the molding process is not a significant factor in the molding process.
Gravity effect in thick-walled parts
For thicker walled parts where flow is more viscous, defects such as hesitation or jetting can occur due to the effect of gravity. Therefore, in thick-walled 3D models, you can set the direction of gravity to determine whether gravity has an effect on the injection molding process.