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-   -   Help: gravity in CFX (http://www.cfd-online.com/Forums/cfx/19077-help-gravity-cfx.html)

Dejun Jing July 18, 2002 10:26

Help: gravity in CFX
 
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

neil July 20, 2002 01:11

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

Erich July 22, 2002 08:58

Re: Help: gravity in CFX
 


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