|
[Sponsors] |
May 8, 2002, 22:32 |
Help: apply B.C. in my granular flow model ?
|
#1 |
Guest
Posts: n/a
|
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 |
|
January 8, 2020, 21:38 |
Reply
|
#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 02:37. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Eul-Eul flow, k-e-kp-ep-Theta Turbulence model | us | FLUENT | 5 | April 5, 2011 02:29 |
Cavitation model with non-isothermal flow | pitisrisuk | CFX | 0 | July 14, 2009 14:30 |
Multiphase flow. Dispersed and free surface model | Luis | CFX | 8 | May 29, 2007 18:13 |
How to model two-phase annular flow? | Zhang | FLUENT | 0 | March 6, 2007 15:41 |
fluid flow fundas | ram | Main CFD Forum | 5 | June 17, 2000 21:31 |