X-Git-Url: http://git.salome-platform.org/gitweb/?p=modules%2Fsmesh.git;a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fconstructing_submeshes.doc;h=cf276a57ba70310ec455769135e1539043e236fb;hp=060adae0319fa2d878dd446c71b4d81b5899c63a;hb=fd1943809d016d0223da20a2a492b157cb17146a;hpb=1067ffa6e7e5c394e3a1b17219d8b355a57607cd diff --git a/doc/salome/gui/SMESH/input/constructing_submeshes.doc b/doc/salome/gui/SMESH/input/constructing_submeshes.doc index 060adae03..cf276a57b 100644 --- a/doc/salome/gui/SMESH/input/constructing_submeshes.doc +++ b/doc/salome/gui/SMESH/input/constructing_submeshes.doc @@ -2,35 +2,76 @@ \page constructing_submeshes_page Constructing sub-meshes -Sub-mesh is a mesh on a geometrical sub-object created with algorithms -and/or hypotheses other than the algorithms and hypotheses assigned to -the parent mesh on the parent object. -

-If a geometrical sub-object belongs to several geometrical objects -having different meshes or sub-meshes, it will be meshed with the -hypotheses of a sub-mesh of a lower dimension.
-For example, a face of a box is meshed with a sub-mesh using algorithms -and hypotheses other than the parent mesh on the whole box. The face -and the box share four edges, which will be meshed with algorithms and -hypotheses of the sub-mesh on the face, because the face is a 2D object -while the box is a 3D object.
- If the dimensions are the same, an arbitrary algorithm/hypothesis - will be used. This means that an edge shared by two faces each having - its own different sub-mesh, will be meshed using algorithms and - hypotheses of any of the two, chosen randomly. This indeterminacy can - be fixed by defining \ref submesh_order_anchor "Sub-mesh priority". The - default sub-meshes priority is such that multi-dimensional algorithms - are processed first. -
+By purpose, the sub-mesh is an object used to assign to a sub-shape +different meshing parameters than those assigned to the main shape. + +Structurally, the sub-mesh is a mesh on a certain sub-shape, or a group of +sub-shapes, possibly generated using different meshing algorithms +and/or hypotheses than those used to generate the mesh on other +sub-shapes. + +Creation of a sub-mesh allows to control individually meshing of a +certain sub-shape, thus allowing to get mesh locally coarser or finer, to get +elements of different types in the same mesh etc. + +A sub-shape to create a sub-mesh on should be retrieved from the main shape +in one of the following ways: + +Internally, definition of meshing parameters to apply for +discretization of a certain sub-shape, for example an edge of a +compound of solids, starts from searching an algorithm, 1D as for the +edge. The following sub-shapes are sequentially checked for presence +of a sub-mesh where 1D algorithm is assigned: + +(This sequence of sub-shapes defines priority of sub-meshes. Thus more +local, i.e. assigned to sub-shape of lower dimension, algorithms and +hypotheses have higher priority during the search of hypotheses to +apply.) + +As soon as an 1D algorithm is found the search stops and the same +sequence of sub-shapes is checked to find a main and additional 1D +hypotheses the found 1D algorithm can take into account. + +The multi-dimensional algorithms have higher priority than +uni-dimensional algorithms if they are assigned to sub-meshes of the +same priority. + +If meshing parameters are defined on sub-meshes of the same priority, +for example different 1D hypotheses are assigned to two faces sharing +an edge, an arbitrary algorithm/hypothesis will be used for +meshing. This indeterminacy can be fixed by +\ref submesh_order_anchor "Changing" mutual priority of such +concurrent sub-meshes. + \n Construction of a sub-mesh consists of:
To construct a sub-mesh: @@ -52,10 +93,11 @@ The following dialog box will appear: \par It allows to define the \b Name, the parent \b Mesh and the \b Geometry (e.g. a face if the parent mesh has been built on box) of the -sub-mesh. You can define algorithms and hypotheses in the same way as -in \ref constructing_meshes_page "Create mesh" menu. +sub-mesh. You can define meshing algorithms and hypotheses in the same way as +in \ref constructing_meshes_page "Create mesh" dialog. \par +\anchor subshape_by_mesh_elem If the parent mesh is already computed, then you can define the \b Geometry by picking mesh elements computed on a sub-shape of interest in the 3D Viewer, i.e. you do not have to extract this sub-shape @@ -77,12 +119,13 @@ Browser. \image html find_geom_by_mesh_elem.png \par -In this dialog, Element Type defines kind of element to pick in the -Viewer. +In this dialog, Element Type defines a kind of element to pick in the +Viewer. Instead of picking an element in the Viewer, you can type its ID in Element ID field. - Geometry name field allows defining a name of the sub-shape. - + Geometry name field allows defining a name of the sub-shape, +with which the sub-shape will appear in the Object Browser (if not yet +there). \par In the Object Browser the structure of the new sub-mesh will be @@ -93,11 +136,13 @@ displayed as follows: \par It contains:
See Also a sample TUI Script of a