X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2F2d_meshing_hypo.doc;h=e019c8b87ff3c96bc64f282dc329f8b3395aab1b;hb=d9b70538644d78d4defa84cb64d7b28aa526e000;hp=38efc810cf3624f94b4f49be8819119d7d5a93c9;hpb=2cd148d0668de3bfbeeceeb7df1995bb5b39475b;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 38efc810c..e019c8b87 100644 --- a/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc +++ b/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc @@ -38,32 +38,12 @@ of a given face. \image html hypo_quad_params_dialog.png "Quadrangle parameters creation/edition dialog" -Quadrangle parameters is a hypothesis for Quadrangle (Mapping). +Quadrangle parameters is a hypothesis for Quadrangle (Mapping) algorithm. -Base vertex parameter 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). - -\image html hypo_quad_params_1.png "A face built from 3 edges" - -\image html hypo_quad_params_res.png "The resulting mesh" - -This parameter can be also used to mesh a segment of a circular face. -Please, consider that there is a limitation on the selection of the -vertex for the faces built with the angle > 180 degrees (see the picture). - -\image html hypo_quad_params_2.png "3/4 of a circular face" - -In this case, selection of a wrong vertex for the Base vertex -parameter will generate a wrong mesh. The picture below -shows the good (left) and the bad (right) results of meshing. - -\image html hypo_quad_params_res_2.png "The resulting meshes" - -Type parameter is used on faces with a different number of -segments on opposite sides to define the algorithm of transition -between them. The following types are available: +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 +algorithms are available: - Standard is the default case, when both triangles and quadrangles are possible in the transition area along the finer meshed sides. @@ -92,7 +72,65 @@ between them. The following types are available: to Nmin segments is log3( Nmax / Nmin ). The number of face rows is equal to the number of segments on each of equally discretized sides. - \image html reduce_three_to_one.png "The fastest transition pattern: 3 to 1" + +\image html reduce_three_to_one.png "The fastest transition pattern: 3 to 1" + +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). + +\image html hypo_quad_params_dialog_vert.png "Base Vertex tab of Quadrangle parameters creation/edition dialog" + +\image html hypo_quad_params_1.png "A face built from 3 edges" + +\image html hypo_quad_params_res.png "The resulting mesh" + +This parameter can be also used to mesh a segment of a circular face. +Please, consider that there is a limitation on the selection of the +vertex for the faces built with the angle > 180 degrees (see the picture). + +\image html hypo_quad_params_2.png "3/4 of a circular face" + +In this case, selection of a wrong vertex for the Base vertex +parameter will generate a wrong mesh. The picture below +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" + +Enforced nodes tab allows for 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. + +\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 + account the enforced vertex (yellow point).
    2. +
  2. Middle image: A node closest to the enforced vertex is + detected. Extreme nodes of the row and column of the detected node + are used to create virtual edges (yellow lines) ending at the + enforced vertex.
    3. +
  3. Right image: The meshed face is thus divided by the virtual + edges into four quadrilateral sub-domains each of which is meshed + as usually: the nodes of the row and column of detected node are + moved to the virtual edges and the quadrilateral elements are + constructed. +
+If there are several enforced vertices, the algorithm is applied +recursively to the formed sub-domains. See Also a sample TUI Script of a \ref tui_quadrangle_parameters "Quadrangle Parameters" hypothesis.