X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2F2d_meshing_hypo.doc;h=308a6899ad1abbb854117cf134461fd32f26987c;hb=63c75f2e20fda47e06650e57e250a16734229302;hp=e019c8b87ff3c96bc64f282dc329f8b3395aab1b;hpb=5d68554076bbca0e1e95fb0db215a6c2b84b6c54;p=modules%2Fsmesh.git diff --git a/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc b/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc index e019c8b87..308a6899a 100644 --- a/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc +++ b/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc @@ -11,7 +11,7 @@ Max Element Area hypothesis is applied for meshing of faces composing your geometrical object. Definition of this hypothesis -consists of setting the maximum area of mesh elements, +consists of setting the maximum area of mesh faces, which will compose the mesh of these faces. \image html a-maxelarea.png @@ -26,9 +26,9 @@ which will compose the mesh of these faces. \anchor length_from_edges_anchor

Length from Edges

-Length from edges hypothesis builds 2D mesh elements having a -maximum linear size calculated as an average segment length for a wire -of a given face. +Length from edges hypothesis defines the maximum linear size of +mesh faces as an average length of mesh edges approximating +the meshed face boundary. See Also a sample TUI Script of a \ref tui_length_from_edges "Length from Edges" hypothesis operation. @@ -36,13 +36,13 @@ of a given face. \anchor hypo_quad_params_anchor

Quadrangle parameters

-\image html hypo_quad_params_dialog.png "Quadrangle parameters creation/edition dialog" +\image html hypo_quad_params_dialog.png "Quadrangle parameters: Transition" -Quadrangle parameters is a hypothesis for Quadrangle (Mapping) algorithm. +Quadrangle parameters is a hypothesis for \ref quad_ijk_algo_page. Transition tab is used to define the algorithm of transition -between opposite sides of faces with a different number of -segments on opposite sides. The following types of transition +between opposite sides of the face with a different number of +segments on them. The following types of transition algorithms are available: - Standard is the default case, when both triangles and quadrangles @@ -54,7 +54,7 @@ algorithms are available: - Quadrangle preference forces building only quadrangles in the transition area along the finer meshed sides. This hypothesis has a restriction: the total quantity of segments on all - four sides of the face must be even (divisible by 2). + four face sides must be even (divisible by 2). \note This type corresponds to Quadrangle Preference additional hypothesis, which is obsolete now. - Quadrangle preference (reversed) works in the same way and @@ -63,9 +63,9 @@ algorithms are available: - Reduced type forces building only quadrangles and the transition between the sides is made gradually, layer by layer. This type has a limitation on the number of segments: one pair of opposite sides must have - the same number of segments, the other pair must have an even difference - between the numbers of segments on the sides. In addition, the number - of rows between sides with different discretization + the same number of segments, the other pair must have an even total + number of segments. In addition, the number of rows + between sides with different discretization should be enough for the transition. Following the fastest transition pattern, three segments become one (see the image below), hence the least number of face rows needed to reduce from Nmax segments @@ -77,10 +77,10 @@ algorithms are available: Base vertex tab allows using Quadrangle (Mapping) algorithm for meshing of trilateral faces. In this case it is -necessary to select the vertex, which will be used as the fourth edge -(degenerated). +necessary to select the vertex, which will be used as the forth +degenerated side of quadrangle. -\image html hypo_quad_params_dialog_vert.png "Base Vertex tab of Quadrangle parameters creation/edition dialog" +\image html hypo_quad_params_dialog_vert.png "Quadrangle parameters: Base Vertex" \image html hypo_quad_params_1.png "A face built from 3 edges" @@ -98,9 +98,9 @@ shows the good (left) and the bad (right) results of meshing. \image html hypo_quad_params_res_2.png "The resulting meshes" -\image html hypo_quad_params_dialog_enf.png "Enforced nodes tab of Quadrangle parameters creation/edition dialog" +\image html hypo_quad_params_dialog_enf.png "Quadrangle parameters: Enforced nodes" -Enforced nodes tab allows for defining points where the +Enforced nodes tab allows defining points, where the algorithm should create nodes. There are two ways to define positions of the enforced nodes. -Algorithm of creation of the enforced nodes is following. +\note Enforced nodes cannot be created at \b Reduced transition type. -\image html hypo_quad_params_enfnodes_algo.png "Steps of the algorithm of creation of the enforced nodes" -
    -
  1. Left image: Positions of nodes are computed without taking into +Let us see how the algorithm works: +
+ +\image html hypo_quad_params_enfnodes_algo3.png "Final mesh" + + If there are several enforced vertices, the algorithm is applied recursively to the formed sub-domains.