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May 8, 2002, 23:32 |
Help: apply B.C. in my granular flow model ?
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#1 |
Guest
Posts: n/a
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Hi,
I am modeling a gas-granular flow using FLUENT 6.0. My problem is: A hopper with open bottom and top is filled with sand. It is a transient problem, and the initial condition is that the hopper is almost full of still sand. I model the flow behavior of sand until all sands flow out of hopper. So, my problem is similar to the flow behavior in a hourglass. I am using Eulerian multiphase model. Now, I have question with applying boundary conditions. (1) The top of hopper is open. No sand will reach here, but gas may flow in or out through this face. I plan to use Pressure-Outlet boundary conditions. I will define the operating pressure to be environment atosmophere pressure, and prescribe zero value for gauge pressure. Because I am not sure the gas is flowing in or out, I am not sure whether my usage of pressure-outlet B.C. is correct. Also, because sands can not reach the top, can I set the granular temperature of sand to zero at the top face? (2) The bottom of the hopper is also open. The sands are flowing out here but I am also not sure the gas is flowing in or out. I plan to apply outflow boundary condition here for both phases (mix), which means that the normal gradients for all flow variables except pressure are zero. Is this method correct? I am a new user of FLUENT, and I am eager to get any suggestion or instruction from you. Thank you very much for your generous help. Derek |
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January 8, 2020, 22:38 |
Reply
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#2 |
New Member
Roy James
Join Date: Feb 2019
Posts: 3
Rep Power: 7 |
Hi, Derek Jing
I think you can try those settings you mentioned above. The result will tell you whether those settings are correct or not. Last edited by 10120605; January 9, 2020 at 03:37. |
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