12.1.9. Internal surfaces (IS)

12.1.9.1. IS_I_E(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

I index of the east-most cell

12.1.9.2. IS_I_W(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

I index of the west-most cell.

12.1.9.3. IS_J_N(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

J index of the north-most cell

12.1.9.4. IS_J_S(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

J index of the south-most cell

12.1.9.5. IS_K_B(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

K index of the bottom-most cell

12.1.9.6. IS_K_T(IS)

Data Type: INTEGER

  • \(1 \le IS \le 500\)

K index of the top-most cell

12.1.9.7. IS_PC(IS, IDX)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

  • \(1 \le IDX \le 2\)

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]

12.1.9.8. IS_REBIN_N

Data Type: INTEGER

Frequency of STL facets binning to the DES grid. This is only meant to be used for granular DEM, CGP, SQP or GSP models to move internal surfaces defined by STL files.

12.1.9.9. IS_TYPE(IS)

Data Type: CHARACTER

  • \(1 \le IS \le 500\)

Type of internal surface

Table 12.46 Valid Values

Name

Default?

Description

IMPERMEABLE (IP)

No gas or solids flow through the surface.

SEMIPERMEABLE (SP)

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 (IP)

No gas or solids flow in the X direction.

X_SEMIPERMEABLE (SP)

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 (IP)

No gas or solids flow in the Y direction.

Y_SEMIPERMEABLE (SP)

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 (IP)

No gas or solids flow in the Z direction.

STL (IP)

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.

12.1.9.10. IS_VEL_S(IS, PHASE)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

  • \(1 \le Phase \le 10\)

Value of fixed solids velocity through semipermeable surfaces.

12.1.9.11. IS_WALL_OMEGA(IS, COMPONENT)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

  • \(1 \le Component \le 3\)

Internal surface angular velocity. This is only meant to be used for granular DEM, CGP, SQP or GSP models to move internal surfaces defined by STL files. The rotation occurs around the center point defined with IS_WALL_ROT_CENTER. Example: a smooth rotating drum. The first index is the IS ID, the second index is the component (1=x, 2=y, 3=z)

12.1.9.12. IS_WALL_ROT_CENTER(IS, COMPONENT)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

  • \(1 \le Component \le 3\)

Internal surface center of rotation. This is only meant to be used for granular DEM, CGP, SQP or GSP models to move internal surfaces defined by STL files. This keywords is used in conjunction with IS_WALL_OMEGA. Example: a mixer with rotating paddles. The first index is the IS ID, the second index is the component (1=x, 2=y, 3=z)

12.1.9.13. IS_WALL_VEL(IS, COMPONENT)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

  • \(1 \le Component \le 3\)

Internal surface translational velocity. This is only meant to be used for granular DEM, CGP, SQP or GSP models to move internal surfaces defined by STL files. Example: a valve moving up and down. The first index is the IS ID, the second index is the component (1=x, 2=y, 3=z)

12.1.9.14. IS_X_E(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

X coordinate of the east face or edge.

12.1.9.15. IS_X_W(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

X coordinate of the west face or edge.

12.1.9.16. IS_Y_N(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

Y coordinate of the north face or edge.

12.1.9.17. IS_Y_S(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

Y coordinate of the south face or edge.

12.1.9.18. IS_Z_B(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

Z coordinate of the bottom face or edge.

12.1.9.19. IS_Z_T(IS)

Data Type: DOUBLE PRECISION

  • \(1 \le IS \le 500\)

Z coordinate of the top face or edge.