Boundary condition. Error 1100

MFiX
#1

JE7KL%7D%24~%251A%7B7NM%25AW~TIDS
JE7KL%7D%24~%251A%7B7NM%25AW~TIDS317×568 32.3 KB

I want to add some stabilizer in the spout fluidized bed. So I defined four small planes, as the pictures show (colourful rectangular area), and set them as no-slip wall. But it reports a problem.
Besides, if I want to use a complex geometrical stabilizer, I just picture them in the STL.file, will that work?

#2

I set the plane from zmin to zmax. but it still reports problems.
Memory required: 9.00 Mb

From: CHECK_GEOMETRY_DES

Info: DES grid size:

DESGRIDSEARCH_IMAX = 20

DESGRIDSEARCH_JMAX = 100

DESGRIDSEARCH_KMAX = 2

From: CHECK_BC_GEOMETRY_WALL

Error 1100: Invalid location specified for BC 6.

X: 0.15000E-01, 0.30000E-01 I: 3, 4

Y: 0.17100 , 0.17100 J: 32, 31

Z: 0.0000 , 0.15000E-01 K: 2, 3

From: CHECK_BC_GEOMETRY_WALL

Error 1100: Invalid location specified for BC 7.

X: 0.45000E-01, 0.60000E-01 I: 6, 7

Y: 0.17100 , 0.17100 J: 32, 31

Z: 0.0000 , 0.15000E-01 K: 2, 3

From: CHECK_BC_GEOMETRY_WALL

Error 1100: Invalid location specified for BC 8.

X: 0.90000E-01, 0.10500 I: 11, 11

Y: 0.17100 , 0.17100 J: 32, 31

Z: 0.0000 , 0.15000E-01 K: 2, 3

From: CHECK_BC_GEOMETRY_WALL

Error 1100: Invalid location specified for BC 9.

X: 0.12000 , 0.13500 I: 14, 14

Y: 0.17100 , 0.17100 J: 32, 31

Z: 0.0000 , 0.15000E-01 K: 2, 3

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MFiX running: elapsed time 0:00:00

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#3

The error message shows

X:   0.15000E-01, 0.30000E-01    I: 3, 4
Y:   0.17100,     0.17100        J: 32, 31
Z:   0.00000,     0.15000E-01    K: 2, 3

From this we can tell that he solver cannot correctly identify the J cell indices for the wall. This is because, MFIX expects walls to have thickness. If you want an infinitesimally thin wall in the middle of the domain, use an internal surface. See the online documentation for additional information.

#4

I checked the internal surface function. It is more like a reducer. I can totally cut off the penetration of the gas flow. However, I can let the particle bounce back when it touches the surface.