Values, macros and structures in Gerris

From Gerris

Contents 1 Values defined in Gerris 2 Gerris Macros 3 Gerris structures 3.1 CellCube 3.2 CellFace 3.3 CompatPar 3.4 DiffusionCoeff 3.5 FttCell 3.6 FttCellChildren 3.7 FttCellFace 3.8 FttCellFlags 3.9 FttCellNeighbors 3.10 FttCellTraverse 3.11 FttComponent 3.12 FttDirection 3.13 FttFaceType 3.14 FttOct 3.15 FttRootCell 3.16 FttTraverseType 3.17 FttVector 3.18 GfsBc

Values defined in Gerris

N_CELLS = FTT_CELLS = <math>2^{dimension}</math>

FTT_NEIGHBORS_2D = (FTT_BOTTOM) + 1

GFS_STATUS_UNDEFINED = 0

GFS_STATUS_SOLID = 1

GFS_STATUS_FLUID = 2

Gerris Macros

Gerris structures

CellCube

typedef struct {
  GtsPoint p[8];
  GfsSegment s[12];
}

The vertices of the cube are stored in the GtsPoint array and the edges in the GfsSegment array.

CellFace

typedef struct {
  GtsPoint p[4];
  GfsSegment s[4];
}

The vertices of the face are stored in the GtsPoint array and the edges in the GfsSegment array.

CompatPar

typedef struct {
  GfsVariable * lhs;
  gboolean dirichlet;
}

The homogeneous version of the considered GfsVariable is stored in lhs.

DiffusionCoeff

typedef struct {
  GfsSourceDiffusion * d;
  gdouble lambda2[FTT_DIMENSION];
  gdouble dt;
  GfsVariable * rhoc, * metric;
  GfsFunction * alpha;
  GfsDomain * domain;
}

d is a GfsSourceDiffusion, dt is the timestep, the GfsVariable rhoc is the mass, metric is the implicit metric term, the GfsFunction alpha is the inverse of the density and domain is the considered GfsDomain.

FttCell

struct {
  /*<public>*/
  guint flags;
  gpointer data;
 
  /*<private>*/
  struct _FttOct * parent, * children;
}

children and parent are the two FttOcts associated with the FttCell.

FttCellChildren

struct {
  FttCell * c[FTT_CELLS];
};

The children of the considered FttCell are stored in c (4 in 2D and 8 in 3D).

FttCellFace

See FttCellFace.

FttCellFlags

typedef enum {
  FTT_FLAG_ID = 7,
  FTT_FLAG_DESTROYED = 1 << 3,
  FTT_FLAG_LEAF = 1 << 4, /* used only for I/O operations */
  FTT_FLAG_TRAVERSED = FTT_FLAG_LEAF, /* used for face traversal */
  FTT_FLAG_USER = 5 /* user flags start here */
}

FttCellNeighbors

struct {
  /* right, left, top, bottom, front, back */
  FttCell * c[FTT_NEIGHBORS];
}

c is the array containing the neighbors of a considered FttCell.

FttCellTraverse

struct {
  FttCell ** cells;
  FttCell ** curent;
}

FttComponent

typedef enum
{
  FTT_X = 0,
  FTT_Y,
#if (!FTT_2D)
  FTT_Z,
#endif /* FTT_3D */
  FTT_DIMENSION,
  FTT_XY,
#if FTT_2D
  FTT_XYZ = FTT_XY
#else /* FTT_3D */
  FTT_XYZ
#endif /* FTT_3D */
}

FttDirection

See FttDirection.

FttFaceType

typedef enum {
  FTT_BOUNDARY,
  FTT_FINE_FINE,
  FTT_FINE_COARSE
}

FttOct

struct {
  guint level;
  FttCell * parent;
  FttCellNeighbors neighbors;
  FttVector pos;
 
  FttCell cells[FTT_CELLS];
}

parent is the FttCell to which the FttOct is linked, level its level (0 for the root, 1 for the children of the root, and so on). The FttCellNeighbors neighbors stores the neighbors of parent and the FttVector pos gives the coordinates of the center of parent. The array cells contains the children of parent.

FttRootCell

struct{
  FttCell cell;
 
  FttCellNeighbors neighbors;
  FttVector pos;
  guint level;
  gpointer parent;
}

The FttCellNeighbors neighbors stores the neighbors of the FttCell cell (which should be FttRootCells too). The FttVector pos gives the coordinates of the center of cell and level is the level of cell (the size of cell is <math>2^{level}</math>).

FttTraverseType

typedef enum {
  FTT_PRE_ORDER,
  FTT_POST_ORDER
}

When the type FTT_PRE_ORDER is used, the traversed FttCell is considered before its FttCellChildren (and all functions are applied in this order). It happens the other way when the type FTT_POST_ORDER is used.

FttVector

struct {
  gdouble x, y, z;
}

FttVector defines a vector of coordinates x, y, and z.

GfsBc

struct {
  /*< private >*/
  GtsObject parent;
  GfsLinearProblem * lp;
 
  /*< public >*/
  GfsBoundary * b;
  GfsVariable * v;
  gboolean extra;
  FttFaceTraverseFunc bc, homogeneous_bc;
  FttFaceTraverseFunc homogeneous_bc_stencil;
  FttFaceTraverseFunc face_bc;
}