11.1.19. Cartesian Grid¶

11.1.19.1. CARTESIAN_GRID¶

Data Type: LOGICAL

Activate Cartesian grid cut cell technique.

Table 11.81 Valid Values¶
Name	Default?	Description
`.FALSE.`	◉	Do not use Cartesian grid cut cell technique.
`.TRUE.`		Use Cartesian grid cut cell technique.

11.1.19.2. N_QUADRIC¶

Data Type: INTEGER

Number of quadric surfaces defining the boundaries (<=100).

11.1.19.3. USE_STL¶

Data Type: LOGICAL

Use STL file to describe geometry.

Table 11.82 Valid Values¶
Name	Default?	Description
`.FALSE.`	◉	Do not use STL file.
`.TRUE.`		Read triangulated geometry (for 3d geometry only) from geometry_####.stl.

11.1.19.4. USE_MSH¶

Data Type: LOGICAL

Use .msh file to describe geometry.

Table 11.83 Valid Values¶
Name	Default?	Description
`.FALSE.`	◉	Do not use .msh file.
`.TRUE.`		Read geometry (for 3d geometry only) from geometry.msh.

11.1.19.5. USE_POLYGON¶

Data Type: LOGICAL

Use polygons to describe geometry.

Table 11.84 Valid Values¶
Name	Default?	Description
`.FALSE.`	◉	Do not use polygons.
`.TRUE.`		Read polygon data (for 2d geometry only) from poly.dat.

11.1.19.6. N_USR_DEF¶

Data Type: INTEGER

Number of user-defined functions (currently limited to: 0 or 1). If set to 1, the geometry is defined in the user subroutine eval_usr_fct.f.

Table 11.85 Valid Values¶
Name	Default?	Description
`0`	◉	Do not use user-defined function
`1`		Use one user-defined function

11.1.19.7. QUADRIC_FORM(QUADRIC ID)¶

Data Type: CHARACTER

\(1 \le Quadric ID \le 500\)

Form of the quadric surface equation.

Table 11.86 Valid Values¶
Name	Default?	Description
`normal`	◉	Use normal form, as defined in equation (1). The LAMDBAs and D must be defined
`plane`		Plane. Needs to define N_X,N_Y,N_Z (unit normal vector pointing away from fluid cells).
`x_cyl_int`		Cylinder aligned with x-axis, internal flow. Needs to define RADIUS(QID).
`x_cyl_ext`		Cylinder aligned with x-axis, external flow. Needs to define RADIUS(QID).
`y_cyl_int`		Cylinder aligned with y-axis, internal flow. Needs to define RADIUS(QID).
`y_cyl_ext`		Cylinder aligned with y-axis, external flow. Needs to define RADIUS(QID).
`z_cyl_int`		Cylinder aligned with z-axis, internal flow. Needs to define RADIUS(QID).
`z_cyl_ext`		Cylinder aligned with z-axis, external flow. Needs to define RADIUS(QID).
`x_cone`		Cone aligned with x-axis, internal flow. Needs to define HALF_ANGLE(QID).
`y_cone`		Cone aligned with y-axis, internal flow. Needs to define HALF_ANGLE(QID).
`z_cone`		Cone aligned with z-axis, internal flow. Needs to define HALF_ANGLE(QID).
`sphere_int`		Sphere, internal flow. Needs to define RADIUS(QID).
`sphere_ext`		Sphere, external flow. Needs to define RADIUS(QID).
`C2C`		Cylinder-to-cylinder conical junction, internal flow. Needs to be defined between two cylinders.
`Torus_int`		Torus, internal flow. Needs to define TORUS_R1(QID) and TORUS_R2(QID).A torus is not a quadric surface but is defined as a basic shape.
`Torus_ext`		Torus, external flow. Needs to define TORUS_R1(QID) and TORUS_R2(QID).
`Y_UCOIL_EXT`		Pair of parallel cylinders (y-direction), capped at both ends by a cylinder at 90 degree angle to create a U-shaped coil. Needs UCOIL_R1, UCOIL_R2, UCOIL_Y1, UCOIL_Y2.
`XY_BEND_INT`		Bend between two cylinders in the XY plane, Needs BEND_R1,BEND_R2,BEND_THETA1,BEND_THETA2.
`Y_C2C_INT`		connects two vertical cylinders by a conical section. Needs C2C_R1,C2C_R2,C2C_Y1,C2C_Y2.
`REACTOR1`		Reactor, made of two vertical cylinders, connected by a conical section. Each cylinder is rounded and closed by a conical cap. Needs REACTOR1_R1,REACTOR1_R2,REACTOR1_Y1,REACTOR1_Y2, REACTOR1_YR1,REACTOR1_YR2,REACTOR1_RR1,REACTOR1_RR2, REACTOR1_THETA1,REACTOR1_THETA2.

11.1.19.8. QUADRIC_SCALE¶

Data Type: DOUBLE PRECISION

Scaling factor, applied to all quadric geometry parameters. Must be a positive number.

11.1.19.9. LAMBDA_X(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Coefficient LAMBDA_X in equation (1) (‘NORMAL’ form) or x-component of normal vector defining plane in equation (5) (‘DEGENERATE’ form).

11.1.19.10. LAMBDA_Y(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Coefficient LAMBDA_Y in equation (1) (‘NORMAL’ form) or y-component of normal vector defining plane in equation (5) (‘DEGENERATE’ form).

11.1.19.11. LAMBDA_Z(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Coefficient LAMBDA_Z in equation (1) (‘NORMAL’ form) or z-component of normal vector defining plane in equation (5) (‘DEGENERATE’ form).

11.1.19.12. DQUADRIC(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Coefficient D in equation (1).

11.1.19.13. THETA_X(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Rotation angle with respect to x-axis (degrees).

11.1.19.14. THETA_Y(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Rotation angle with respect to y-axis (degrees).

11.1.19.15. THETA_Z(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Rotation angle with respect to z-axis (degrees).

11.1.19.16. RADIUS(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cylinder radius (used when QUADRIC_FORM = *_CYL_***)

11.1.19.17. HALF_ANGLE(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cone half angle, expressed in degrees (used when QUADRIC_FORM = *_CONE)

11.1.19.18. TORUS_R1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Torus Radius 1 (used when QUADRIC_FORM = TORUS_*), R1>R2 for a ring.

11.1.19.19. TORUS_R2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Torus Radius 2 (used when QUADRIC_FORM = TORUS_*), R1>R2 for a ring.

11.1.19.20. UCOIL_R1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

U-shaped coil Radius 1 (used when QUADRIC_FORM = UCOIL*), UCOIL_R1>UCOIL_R2.

11.1.19.21. UCOIL_R2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

U-shaped coil Radius 2 (used when QUADRIC_FORM = UCOIL*), UCOIL_R1>UCOIL_R2.

11.1.19.22. UCOIL_Y1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

U-shaped coil ymax (used when QUADRIC_FORM = UCOIL*), UCOIL_Y2>UCOIL_Y1.

11.1.19.23. UCOIL_Y2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

U-shaped coil ymin (used when QUADRIC_FORM = UCOIL*), UCOIL_Y2>UCOIL_Y1.

11.1.19.24. BEND_R1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Bend Radius 1 (used when QUADRIC_FORM = BEND*), BEND_R1>BEND_R2.

11.1.19.25. BEND_R2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Bend Radius 2 (used when QUADRIC_FORM = BEND*),: BEND_R1>BEND_R2.

11.1.19.26. BEND_THETA1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Bend start angle, in degrees (used when QUADRIC_FORM = BEND*).

11.1.19.27. BEND_THETA2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Bend end angle, in degrees (used when QUADRIC_FORM = BEND*).

11.1.19.28. C2C_R1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cylinder-cone_cylinder Radius 1 (used when QUADRIC_FORM = C2C*).

11.1.19.29. C2C_R2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cylinder-cone_cylinder Radius 2 (used when QUADRIC_FORM = C2C*).

11.1.19.30. C2C_Y1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cylinder-cone_cylinder Y1 (used when QUADRIC_FORM = C2C*). If Y1=Y2, then R1=R2.

11.1.19.31. C2C_Y2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Cylinder-cone_cylinder Y2 (used when QUADRIC_FORM = C2C*). If Y1=Y2, then R1=R2.

11.1.19.32. REACTOR1_R1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, lower cylinder radius.

11.1.19.33. REACTOR1_R2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, upper cylinder radius.

11.1.19.34. REACTOR1_Y1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, lower conical transition between cylinders.

11.1.19.35. REACTOR1_Y2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, upper conical transition between cylinders.

11.1.19.36. REACTOR1_YR1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, lower rounding below cylinder.

11.1.19.37. REACTOR1_YR2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, upper rounding above cylinder.

11.1.19.38. REACTOR1_RR1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, lower rounding radius.

11.1.19.39. REACTOR1_RR2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, upper rounding radius.

11.1.19.40. REACTOR1_THETA1(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, lower rounding angle (degrees).

11.1.19.41. REACTOR1_THETA2(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Reactor 1, upper rounding angle (degrees).

11.1.19.42. N_X(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

X-component of normal vector defining the plane (used when QUADRIC_FORM = PLANE).

11.1.19.43. N_Y(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Y-component of normal vector defining the plane (used when QUADRIC_FORM = PLANE).

11.1.19.44. N_Z(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Z-component of normal vector defining the plane (used when QUADRIC_FORM = PLANE).

11.1.19.45. T_X(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Translation in x-direction.

11.1.19.46. T_Y(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Translation in y-direction.

11.1.19.47. T_Z(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Translation in z-direction.

11.1.19.48. CLIP_XMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower x-limit where the quadric is defined.

11.1.19.49. CLIP_XMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper x-limit where the quadric is defined.

11.1.19.50. CLIP_YMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower y-limit where the quadric is defined.

11.1.19.51. CLIP_YMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper y-limit where the quadric is defined.

11.1.19.52. CLIP_ZMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower z-limit where the quadric is defined.

11.1.19.53. CLIP_ZMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper z-limit where the quadric is defined.

11.1.19.54. PIECE_XMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower x-limit where the quadric is defined in a piecewise group.

11.1.19.55. PIECE_XMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper x-limit where the quadric is defined in a piecewise group.

11.1.19.56. PIECE_YMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower y-limit where the quadric is defined in a piecewise group.

11.1.19.57. PIECE_YMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper y-limit where the quadric is defined in a piecewise group.

11.1.19.58. PIECE_ZMIN(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Lower z-limit where the quadric is defined in a piecewise group.

11.1.19.59. PIECE_ZMAX(QUADRIC ID)¶

Data Type: DOUBLE PRECISION

\(1 \le Quadric ID \le 500\)

Upper z-limit where the quadric is defined in a piecewise group.

11.1.19.60. FLUID_IN_CLIPPED_REGION(QUADRIC ID)¶

Data Type: LOGICAL

\(1 \le Quadric ID \le 500\)

Flag defining the type of cells that are outside of the zone defined by [CLIP_XMIN; CLIP_XMAX], [CLIP_YMIN; CLIP_YMAX], [CLIP_ZMIN; CLIP_ZMAX].

Table 11.87 Valid Values¶
Name	Default?	Description
`.FALSE.`		Remove cells from computational domain.
`.TRUE.`	◉	Treat cells as fluid cells.

11.1.19.61. BC_ID_Q(QUADRIC ID)¶

Data Type: INTEGER

\(1 \le Quadric ID \le 500\)

Boundary condition flag.

11.1.19.62. N_GROUP¶

Data Type: INTEGER

Number of group(s) of quadrics (<=50).

11.1.19.63. GROUP_SIZE(GROUP ID)¶

Data Type: INTEGER

\(1 \le Group ID \le DIM{\_}GROUP\)

Number of quadrics in the group.

11.1.19.64. GROUP_Q(GROUP ID, QUADRIC ID)¶

Data Type: INTEGER

\(1 \le Group ID \le DIM{\_}GROUP\)
\(1 \le Quadric ID \le 500\)

Quadric ID assigned to a group.

11.1.19.65. GROUP_RELATION(GROUP ID)¶

Data Type: CHARACTER

\(1 \le Group ID \le DIM{\_}GROUP\)

Relation among quadrics of a same group.

Table 11.88 Valid Values¶
Name	Default?	Description
`OR`	◉	A point belongs to the computational domain if at least one of f(x,y,z) among all quadrics is negative.
`AND`		A point belongs to the computational domain if all of f(x,y,z) among all quadrics are negative.
`PIECEWISE`		When quadrics intersect along planes that are perpendicular to either the x, y, or z-axis, quadrics can be smoothly combined in a piecewise manner.

11.1.19.66. RELATION_WITH_PREVIOUS(GROUP ID)¶

Data Type: CHARACTER

\(1 \le Group ID \le DIM{\_}GROUP\)

Relation between current group and combination of all previous groups.

Table 11.89 Valid Values¶
Name	Default?	Description
`OR`	◉	A point belongs to the computational domain if f-value for the current group or f-value for the combination of previous groups is negative.
`AND`		A point belongs to the computational domain if f-value for the current group and f-value for the combination of previous groups is negative.

11.1.19.67. TOL_SNAP(DIRECTION)¶

Data Type: DOUBLE PRECISION

\(1 \le Direction \le 3\)

Tolerance used to snap an intersection point onto an: existing cell corner (expressed as a fraction of edge length, between 0.0 and 0.5). For stretched grids, three values can be entered in the x, y and z directions.

11.1.19.68. TOL_DELH¶

Data Type: DOUBLE PRECISION

Tolerance used to limit acceptable values of normal: distance to the wall (expressed as a fraction of cell diagonal, between 0.0 and 1.0).

11.1.19.69. TOL_SMALL_CELL¶

Data Type: DOUBLE PRECISION

Tolerance used to detect small cells (expressed as a: fraction of cell volume, between 0.0 and 1.0).

11.1.19.70. TOL_MERGE¶

Data Type: DOUBLE PRECISION

Tolerance used to remove duplicate nodes (expressed as: a fraction of cell diagonal, between 0.0 and 1.0).

11.1.19.71. TOL_SMALL_AREA¶

Data Type: DOUBLE PRECISION

Tolerance used to detect small faces (expressed as a: fraction of original face area, between 0.0 and 1.0).

11.1.19.81. OUT_STL_VALUE¶

Data Type: DOUBLE PRECISION

Defines value of F_STL outside of the STL geometry. A: value of 1.0 means the domain outside of the STL geometry is excluded from computation, i.e., an internal flow is computed. Note: This depends on the direction of the facet normal vectors.

Table 11.90 Valid Values¶
Name	Default?	Description
`-1.0`		model an external flow
`1.0`	◉	model an internal flow

11.1.19.82. FLIP_STL_NORMALS(BC)¶

Data Type: LOGICAL

\(1 \le BC \le 500\)

Option to flip STL facet normals.: The index corresponds to the BC ID the STL file is applied to.

Table 11.91 Valid Values¶
Name	Default?	Description
`.True.`		Flip normals
`.False.`	◉	Do not flip normals

11.1.19.89. OUT_MSH_VALUE¶

Data Type: DOUBLE PRECISION

Defines value of f outside of the .msh geometry. a: value of 1.0 means the domain outside of the .msh geometry is excluded from computation, i.e., an internal flow is computed.

Table 11.92 Valid Values¶
Name	Default?	Description
`-1.0`		model an external flow
`1.0`	◉	model an internal flow

11.1.19.90. TX_MSH¶

Data Type: DOUBLE PRECISION

Translation in x-direction, applied to the .msh geometry.

11.1.19.91. TY_MSH¶

Data Type: DOUBLE PRECISION

Translation in y-direction, applied to the .msh geometry.

11.1.19.92. TZ_MSH¶

Option for pressure gradient computation in cut cells.

Table 11.95 Valid Values¶
Name	Default?	Description
`1`		Use maximum of (east/west), (north/south), and (top/bottom) pairs of velocity cells.
`2`		Use both (east/west), (north/south), and (top/bottom) areas of velocity cells.
`0`	◉	Use east, north and top areas of pressure cell (same as standard cells).

11.1.19.99. CG_SAFE_MODE¶

Data Type: INTEGER

Run code in safe mode.

Table 11.96 Valid Values¶
Name	Default?	Description
`1`		Performs initial preprocessing but use all original MFiX subroutines during flow solution (using only cell volumes and areas of cut cells).
`0`	◉	Runs the code with modified subroutines for cut cell treatment.

11.1.19.115. DWALL_BRUTE_FORCE¶

Data Type: LOGICAL

Brute force calculation of wall distance.