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-   -   particle problem (http://www.cfd-online.com/Forums/flow-3d/71546-particle-problem.html)

Andy Chen January 7, 2010 01:58

particle problem
 
Dear exprts:

I try many times to add particle(marker particle) in the fluid. When I use specific pressure boundary condition to set fluid height, then I can success to add particle in the fluid. But I use volume fluid rate or specific velocity boundary condition, then I can't see any particle in the fluid. Why?

P.S I use add block and give number in x- y- z- direction.

Thanks your help! Please help me..........

MuxaB January 11, 2010 01:11

Quote:

Originally Posted by Andy Chen (Post 241719)
Dear exprts:

I try many times to add particle(marker particle) in the fluid. When I use specific pressure boundary condition to set fluid height, then I can success to add particle in the fluid. But I use volume fluid rate or specific velocity boundary condition, then I can't see any particle in the fluid. Why?

P.S I use add block and give number in x- y- z- direction.

Thanks your help! Please help me..........

Are the particles not there at all, even at t=0? Do you have fluid initially in the domain? Marker particles can only exists inside fluid, if there is no fluid, the particles will not be initialized.

Andy Chen January 11, 2010 03:30

Quote:

Originally Posted by MuxaB (Post 242076)
Are the particles not there at all, even at t=0? Do you have fluid initially in the domain? Marker particles can only exists inside fluid, if there is no fluid, the particles will not be initialized.

I don't set initial condition. So, you mean that I have to set initial condition. Then, marker particles will exist in the fluid when I use volume fluid rate boundary condition.

Thanks your reply, MuxaB:D


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