ModifyMesh

1 Name

modifyMesh - Manipulates mesh elements.

Valid versions:

2 Synopsis

modifyMesh [OPTIONS]

3 Description

Modify the mesh according the parameters specified in system/modifyMeshDict. The example shipped with the source code (in $FOAM_UTILITIES/mesh/advanced/modifyMesh/modifyMeshDict) is reproduced below.

The modification that can be done are:

• Move points of boundaries
• Split edges of boundaries
• Triangulate faces of boundaries
• Collapse edges
• Split cells
• Repatch faces
• Create cell

-overwrite

Overwrite the existing mesh files

-parallel

Run the utility in parallel

-roots "(DIR1 [...DIRN])"

Directories through which the data are distributed

-case DIR

Execute the command on the case directory DIR. If not provided, use the current directory

-noFunctionObjects

Skip the execution of the functionObjects

-help

Display the help and exit

4 modifyMeshDict description

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      modifyMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Move points:
// Every entry is two coordinates. First one is location of the point to move,
// the second is the position to move to. 
pointsToMove
(
    (( -0.17861 -0.45073 0.75276)( -0.18 -0.45073 0.75276))
);

// Split edge in two:
// First coord is a point on the edge to cut, second is the position of the 
// newly introduced point
edgesToSplit
(
    (( -0.17692 -0.45312 0.74516)( -0.18 -0.45 0.742))
);

// Triangulate a face:
// First coord is a point on the face to triangulate. It will introduce a
// point on the face, triangulate and move the point to the second coordinate.
facesToTriangulate
(
    (( -0.039123 -0.45045 0.74083) (-0.03844 -0.45049 0.73572))
);

// Edges to collapse. First coord is point on the edge, second is coordinate
// to collapse to. 
edgesToCollapse
(
    ((0.054975 0.099987 0.0044074)(0.054975 0.099987 0.0044074))
);

// Split cells:
// First coord is a point inside the cell to split. A point inside the cell will
// be introduced and the cell will get decomposed into polygonal base pyramids
// with this new point as top. (so the original faces will not get split)
cellsToSplit
(
    (( -0.039123 -0.45045 0.74083) (-0.03844 -0.45049 0.73572))
);

// Change patch:
// Changes patchID of faces. Coord selects the face, label is the patch index.
facesToRepatch
(
    (( -0.039123 -0.45045 0.74083) 1)
);

//// Create cell:
//// Creates a cell on the boundary given a face covering a cavity. Gets
//// the vertices of the face (outwards pointing normal) and a point internal
//// to the new cell. (used to check the orientation of the face). Walks all
//// boundary faces reachable from any edge on the face and constructs cell
//// from it.
//cellsToCreate
//(
//    (
//        ((0 0 0) (1 0 0) (1 1 0) (0 1 0))   // vertices of face
//        (0.5 0.5 0.1)                       // cell centre
//    )
//);

// ************************************************************************* //