Hi,

I am modeling fine powders flowing out of a hopper under gravity. I set the axis of the hopper along Z direction, which means that the gravity force is along Z direction.

My results shows that the powders stay still inside the hopper, so this means no gravity acts on the powder. I can not find how to prescribe the gravity. Also, I find that the momentum equation in the Manual does not include a body force (gravity) term.

Can you tell me how to include gravitational effect in the simulation?

Thank you very much for your help.

-Dejun

Hi. You may set it under the keyword: "buoyance parameters", like 0 0 9.8. or use USRBF to set body forces.