specularity Coefficient & multiphase flow

msdkhl · June 21, 2016, 06:34

hello my friends..
i am trying to simulate a 2D fluidized bed with TFM model..
in boundry condition pannel i select specularity coefficient for momentum secondary phase (solid) on the bed wall and i examined datas from 0 to 1 but in all time steps x_velocity, y_velocity and magnitude velocity of secondary phase (solid) on the wall is zero..
i dont underestand what's the problem..
any body can help me?
thank you very much..

orland_one · April 2, 2021, 16:50

I have the same problem.

I am simulating a fluidized bed reactor of circular shape and I am using a laminar model. When I insert the specularity coefficient, whatever value I choose, velocity at the wall remains equal to zero and even for zero specularity coefficient the shear at the wall is different from zero.

Can you help me?

orland_one · April 11, 2021, 13:23

Can anyone help me please?

The_seeker · October 28, 2022, 11:43

Hi All,

I am encountering the same problem. I expect partial slip but could not get non-zero velocities in a fluidized bed with laminar conditions. Also, despite the fact that the instant velocities are zero when I used Fluent's data sampling tool to find the mean average, the mean values were non-zero. I would appreciate if someone can help me on this one.

Regards-

June 21, 2016, 06:34	specularity Coefficient & multiphase flow	#1
msdkhl New Member akbar Join Date: Aug 2015 Posts: 3 Rep Power: 10	hello my friends.. i am trying to simulate a 2D fluidized bed with TFM model.. in boundry condition pannel i select specularity coefficient for momentum secondary phase (solid) on the bed wall and i examined datas from 0 to 1 but in all time steps x_velocity, y_velocity and magnitude velocity of secondary phase (solid) on the wall is zero.. i dont underestand what's the problem.. any body can help me? thank you very much..

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April 2, 2021, 16:50		#2
orland_one New Member Join Date: Feb 2021 Posts: 3 Rep Power: 5	I have the same problem. I am simulating a fluidized bed reactor of circular shape and I am using a laminar model. When I insert the specularity coefficient, whatever value I choose, velocity at the wall remains equal to zero and even for zero specularity coefficient the shear at the wall is different from zero. Can you help me?

April 11, 2021, 13:23		#3
orland_one New Member Join Date: Feb 2021 Posts: 3 Rep Power: 5	Can anyone help me please?

October 28, 2022, 11:43		#4
The_seeker Member Join Date: Feb 2020 Posts: 31 Rep Power: 6	Hi All, I am encountering the same problem. I expect partial slip but could not get non-zero velocities in a fluidized bed with laminar conditions. Also, despite the fact that the instant velocities are zero when I used Fluent's data sampling tool to find the mean average, the mean values were non-zero. I would appreciate if someone can help me on this one. Regards-