Values, macros and structures in Gerris

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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

Ftt Macros

Name of the macro Macro definition
FTT_CELLS_DIRECTION(d) (FTT_CELLS/2)
ftt_cell_dz(c) (1.)
FTT_CELL_ID(c) ((c)->flags & FTT_FLAG_ID)
FTT_CELL_IS_DESTROYED(c) (((c)->flags & FTT_FLAG_DESTROYED) != 0)
FTT_CELL_IS_FLAGGED_LEAF(cell) (((cell)->flags & FTT_FLAG_LEAF) != 0)
FTT_CELL_IS_LEAF(c) ((c)->children == NULL)
FTT_CELL_IS_ROOT(c) ((c)->parent == NULL)
ftt_cell_level(c) ((c)-> parent ? (c)->parent->level + 1 : ((struct _FttRootCell *) c)->level)
ftt_cell_parent(c) ((c)->parent ? (c)->parent->parent : NULL)
FTT_CELLS_DIRECTION(d) (FTT_CELLS/2)
FTT_FACE_DIRECT(f) ((f)->d % 2 == 0)
FTT_FACE_REVERSE(dst, src) ((dst)->cell = (src)->neighbor, (dst)->neighbor = (src)->cell, (dst)->d = FTT_OPPOSITE_DIRECTION((src)->d))
FTT_OPPOSITE_DIRECTION(d) (ftt_opposite_direction[d])
FTT_ORTHOGONAL_COMPONENT(c) (((c) + 1) % FTT_DIMENSION)
FTT_ROOT_CELL(c) ((struct _FttRootCell *) c)
gint ftt_opposite_direction[FTT_NEIGHBORS] =
#if FTT_2D
{1,0,3,2};
#else /* FTT_3D*/
{1,0,3,2,5,4};
#endif /* FTT_3D */

Gfs Macros

Name of the macro Macro definition
GFS_BOUNDRY_PERIODIC(obj) GTS_OBJECT_CAST (obj, GfsBoundaryPeriodic, gfs_boundary_periodic_class())
GFS_CELL_IS_BOUNDARY(cell) (((cell)->flags & GFS_FLAG_BOUNDARY) != 0)

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;
}

The GfsLinearProblem lp is the linear problem being solved by Gerris.

The boundary which is concerned by the given condition is stored in the GfsBoundary b.

The boundary condition is applied to the GfsVariable v.

bc, homogeneous_bc, homogeneous_bc_stencil and face_bc are the functions to call when traversing the tree.


GfsBc is used to define a default symmetry boundary condition.

GfsBoundary

struct {
/*< private >*/
GtsObject parent;
 
FttCell * root;
GfsBox * box;
FttDirection d;
guint depth;
GfsBc * default_bc;
gboolean changed;
 
/*< public >*/
GfsVariable * v;
GfsBoundaryVariableType type;
GHashTable * bc;
}

The boundary defined by this GfsBoundary structure is the one associated with the FttCellFace in FttDirection d of FttCell root.

default_bc is the default symmetry boundary condition (see GfsBc) and box the GfsBox associated with root.

The boundary condition is applied to the GfsVariable v.


GfsBoundary is used to define one of the boundaries of a GfsBox.

GfsBoundaryPeriodic

struct {
/*> private >*/
GfsBoundary parent;
 
GfsBox * matching;
FttDirection d;
GArray * sndbuf, * rcvbuf;
guint sndcount, rcvcount;
 
gdouble rotate;
}

parent is the GfsBoundary concerned by the periodic condition.

This boundary is associated with the GfsBox matching in FttDirection d.

GfsBox

struct {
GtsGNode parent;
 
FttCell * root;
GtsObject * neighbor[FTT_NEIGHBORS];
guint id;
int pid;
gint size;
}

A GfsBox is attached to a FttCell root.

The neighbors are stored in the GtsObject array neighbor.

Its size is given by size, the process identifier associated to this GfsBox by pid, and its id by id.

GfsClock

struct {
gboolean started;
glong start, stop;
}

GfsDomain

struct {
GtsWGraph parent;
 
int pid;
GfsClock * timer;
GHashTable * timers;
 
GtsRange timestep;
GtsRange size;
 
gboolean profile_bc;
 
GtsRange mpi_messages;
GtsRange mpi_wait;
 
guint rootlevel;
FttVector refpos;
FttVector lambda;
 
GArray * allocated;
GSList * variables;
GSList * derived_variables;
 
GfsVariable * velocity[FTT_DIMENSION];
 
GSList * variables_io;
gboolean binary;
gint max_depth_write;
 
FttCellInitFunc cell_init;
gpointer cell_init_data;
 
gint version;
 
gpointer array;
 
gboolean overlap; /* whether to overlap MPI communications with computation */
 
/* coordinate metrics */
gpointer metric_data;
gdouble (* face_metric) (const GfsDomain *, const FttCellFace *);
gdouble (* cell_metric) (const GfsDomain *, const FttCell *);
gdouble (* solid_metric) (const GfsDomain *, const FttCell *);
gdouble (* scale_metric) (const GfsDomain *, const FttCell *, FttComponent);
gdouble (* face_scale_metric) (const GfsDomain *, const FttCellFace *, FttComponent);
gdouble (* viscous_metric_implicit) (const GfsDomain * domain,
FttCell * cell,
FttComponent component);
gdouble (* viscous_metric_explicit) (const GfsDomain * domain,
FttCell * cell,
GfsVariable * v,
GfsDiffusion * d);
void (* advection_metric) (const GfsDomain * domain,
FttCell * cell,
FttComponent c1,
gdouble m[2]);
 
/* Object hash table for (optional) objects IDs */
GHashTable * objects;
 
/* total number of parallel processes */
int np;
 
/* real time */
GTimer * clock;
 
GPtrArray * sorted; /**< array of sorted boxes */
gboolean dirty; /**< whether the sorted array needs updating */
}

parent is the graph defining the geometry of the considered domain. All computations are realised with pid pid.

rootlevel is the root level (default 0). The FttVector refpos gives the position of the center of the domain (default (0,0,0) ). variables is a pointer to the list of all variables computed in the domain, and derived_variables a pointer to the list of all derivatives.

velocity is a GfsVariable pointer to the table of all FTT_DIMENSION components of the velocity of the fluid.

The GfsClock timer is used to compute the CPU time, whereas the GTimer clock is used for the real time.

GfsEvent

struct {
GtsSListContainee parent;
 
gdouble t, start, end, step;
guint i, istart, iend, istep;
 
guint n;
gboolean end_event, realised, redo;
gchar * name;
}

Events are used to control any action which needs to be performed at a given time during a simulation. This includes one-off actions as well as periodically repeated actions.

name is the (optional) name of the event, start the physical starting time (default is zero). The end keyword can be used to indicate the end of the simulation. istart is the time step starting time (default is zero).

step means repeat every step physical time units (default is infinity), istep repeat every istep time steps (default is infinity).

end is the ending physical time (default is infinity; the event can stop before this time if it is never reached) and iend the ending number of time steps (default is infinity).

GfsFaceStateVector

struct {
gdouble un;
gdouble v;
}

GfsFlags

typedef enum {
GFS_FLAG_USED = 1 << FTT_FLAG_USER,
GFS_FLAG_BOUNDARY = 1 << (FTT_FLAG_USER + 1),
GFS_FLAG_DIRICHLET = 1 << (FTT_FLAG_USER + 2),
GFS_FLAG_GRADIENT_BOUNDARY = 1 << (FTT_FLAG_USER + 3),
GFS_FLAG_PERMANENT = 1 << (FTT_FLAG_USER + 4),
GFS_FLAG_THIN = 1 << (FTT_FLAG_USER + 5),
GFS_FLAG_USER = FTT_FLAG_USER + 6 /* user flags start here */
}

GfsGradient

struct {
gdouble a,b;
}

Used for interpolations : v = a*v(cell) + b

GfsInterpolator

struct {
#if FTT_2D
FttCell * c[7];
gdouble w[7];
#else /* 3D */
FttCell * c[29];
gdouble w[29];
#endif /* 3D */
guint n;
}
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