11.1.11. Internal Surface¶

11.1.11.1. IS_X_W(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

X coordinate of the west face or edge.

11.1.11.2. IS_X_E(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

X coordinate of the east face or edge.

11.1.11.3. IS_Y_S(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

Y coordinate of the south face or edge.

11.1.11.4. IS_Y_N(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

Y coordinate of the north face or edge.

11.1.11.5. IS_Z_B(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

Z coordinate of the bottom face or edge.

11.1.11.6. IS_Z_T(IS)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$

Z coordinate of the top face or edge.

11.1.11.7. IS_I_W(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

I index of the west-most cell.

11.1.11.8. IS_I_E(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

I index of the east-most cell

11.1.11.9. IS_J_S(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

J index of the south-most cell

11.1.11.10. IS_J_N(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

J index of the north-most cell

11.1.11.11. IS_K_B(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

K index of the bottom-most cell

11.1.11.12. IS_K_T(IS)¶

Data Type: INTEGER

$1 \leq I S \leq 500$

K index of the top-most cell

11.1.11.13. IS_TYPE(IS)¶

Data Type: CHARACTER

$1 \leq I S \leq 500$

Type of internal surface

Table 11.54 Valid Values¶
Name	Default?	Description
`IMPERMEABLE`		No gas or solids flow through the surface.
`SEMIPERMEABLE`		Gas flows through the surface with an additional resistance. Solids velocity through the surface is set to zero or to a user- specified fixed value (i.e., solids momentum equation for this direction is not solved).
`X_IMPERMEABLE`		No gas or solids flow in the X direction.
`X_SEMIPERMEABLE`		Gas flows in the Z direction with additional resistance. Solids velocity in the Z direction is set to zero or to a user- specified fixed value (i.e., solids momentum equation for this direction is not solved).
`Y_IMPERMEABLE`		No gas or solids flow in the Y direction.
`Y_SEMIPERMEABLE`		Gas flows in the Y direction with additional resistance. Solids velocity in the Y direction is set to zero or to a user- specified fixed value (i.e., solids momentum equation for this direction is not solved).
`Z_IMPERMEABLE`		No gas or solids flow in the Z direction.
`STL`		Arbitrary shaped internal surface defined by an STL file. Only visible to DEM particles or PIC parcels. The fluid phase doesn’t feel this stl internal surface.

11.1.11.14. IS_PC(IS, IDX)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$
$1 \leq I D X \leq 2$

Parameters defining the internal surface. These values need to be specified for semipermeable surfaces only. The thickness used for pressure drop computation is that of the momentum cell (DX_e, DY_n, or DZ_t). To turn off the resistance, use a large value for permeability.

IDX=1: Permeability [1.0E32]
IDX=2: Inertial resistance coefficient [0.0]

11.1.11.15. IS_VEL_S(IS, PHASE)¶

Data Type: DOUBLE PRECISION

$1 \leq I S \leq 500$
$1 \leq P h a s e \leq 10$

Value of fixed solids velocity through semipermeable surfaces.