Keywords derived from tetraedriser

tetraedriser

Inherits from: interprete

To achieve a tetrahedral mesh based on a mesh comprising blocks, the Tetraedriser (Tetrahedralise) interpretor is used in VEF discretization. Initial block is divided in 6 tetrahedra:

Parameters:

• domain_name (type: string) Name of domain.

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tetraedriser_homogene

Inherits from: tetraedriser

Use the Tetraedriser_homogene (Homogeneous_Tetrahedralisation) interpretor in VEF discretization to mesh a block in tetrahedrals. Each block hexahedral is no longer divided into 6 tetrahedrals (keyword Tetraedriser (Tetrahedralise)), it is now broken down into 40 tetrahedrals. Thus a block defined with 11 nodes in each X, Y, Z direction will contain 10*10*10*40=40,000 tetrahedrals. This also allows problems in the mesh corners with the P1NC/P1iso/P1bulle or P1/P1 discretization items to be avoided. Initial block is divided in 40 tetrahedra:

Parameters:

• domain_name (type: string) Name of domain.

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tetraedriser_homogene_compact

Inherits from: tetraedriser

This new discretization generates tetrahedral elements from cartesian or non-cartesian hexahedral elements. The process cut each hexahedral in 6 pyramids, each of them being cut then in 4 tetrahedral. So, in comparison with tetra_homogene, less elements (*24 instead of*40) with more homogeneous volumes are generated. Moreover, this process is done in a faster way. Initial block is divided in 24 tetrahedra:

Parameters:

• domain_name (type: string) Name of domain.

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tetraedriser_homogene_fin

Inherits from: tetraedriser

Tetraedriser_homogene_fin is the recommended option to tetrahedralise blocks. As an extension (subdivision) of Tetraedriser_homogene_compact, this last one cut each initial block in 48 tetrahedra (against 24, previously). This cutting ensures :

• a correct cutting in the corners (in respect to pressure discretization PreP1B),
• a better isotropy of elements than with Tetraedriser_homogene_compact,
• a better alignment of summits (this could have a benefit effect on calculation near walls since first elements in contact with it are all contained in the same constant thickness and ii/ by the way, a 3D cartesian grid based on summits can be engendered and used to realise spectral analysis in HIT for instance). Initial block is divided in 48 tetrahedra:

Parameters:

• domain_name (type: string) Name of domain.

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tetraedriser_par_prisme

Inherits from: tetraedriser

Tetraedriser_par_prisme generates 6 iso-volume tetrahedral element from primary hexahedral one (contrarily to the 5 elements ordinarily generated by tetraedriser). This element is suitable for calculation of gradients at the summit (coincident with the gravity centre of the jointed elements related with) and spectra (due to a better alignment of the points).

Initial block is divided in 6 prismes.

Parameters:

• domain_name (type: string) Name of domain.