X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FNETGENPLUGIN%2Finput%2Fnetgen_2d_3d_hypo.doc;h=cf9c245412a452441ecbae586923967e8f103e4d;hb=1ea8c2828e8ebcfcff032c29aae4fbcc2ad42693;hp=8cc306e08d41ec41036b57be2b6838a9145795b1;hpb=2b9909cbae6ce6a3f1abf26e170c8ff1a3ee2b7c;p=plugins%2Fnetgenplugin.git
diff --git a/doc/salome/gui/NETGENPLUGIN/input/netgen_2d_3d_hypo.doc b/doc/salome/gui/NETGENPLUGIN/input/netgen_2d_3d_hypo.doc
index 8cc306e..cf9c245 100644
--- a/doc/salome/gui/NETGENPLUGIN/input/netgen_2d_3d_hypo.doc
+++ b/doc/salome/gui/NETGENPLUGIN/input/netgen_2d_3d_hypo.doc
@@ -10,13 +10,13 @@ hypotheses and algorithms (2D and 1D for meshing 3D objects and 1D for
meshing 2D objects).
\image html netgen2d3d.png
-
Dialog boxes of Netgen 1D-2D and Netgen
-1D-2D-3D algorithms
+Hypothesis dialog boxes of Netgen 1D-2D and Netgen
+ 1D-2D-3D algorithms are same
\image html netgen2d3d_only.png
Dialog boxes of Netgen 2D and Netgen 3D
-algorithms
+ algorithms
- Name - allows to define the name for the algorithm (Netgen
2D (or 3D) Parameters by default).
@@ -24,21 +24,36 @@ algorithms
- Min Size - minimum linear dimensions for mesh cells. It is
ignored if it is more than Max Size.
- Second Order - if this box is checked in, the algorithm will
-create second order nodes on the mesh, which will then become quadratic.
-- Fineness - ranging from Very Coarse to Very Fine allows to set the
-level of meshing detalization using the three parameters below. You
-can select Custom to define them manually.
+create second order mesh.
+- Fineness - ranging from Very Coarse to Very Fine
+allows to set the level of meshing detalization using the three
+parameters below. You can select \a Custom to define them manually.
- Growth rate - allows to define how much the linear dimensions of
-two adjacent cells can differ (i.e. 0.3 means 30%).
-- Nb. Segs per Edge and Nb Segs per Radius - allows to define the
-minimum number of mesh segments in which edges and radiuses will be
-split.
-- Allow Quadrangles - allows to use quadrangle elements in a
-triangle 2D mesh. This checkbox is not present in Netgen 3D parameters
-because currently building a tetrahedral mesh with quadrangle faces is
-not possible.
-- Optimize - if this box is checked in, the algorithm will try to
-create regular (possessing even sides) elements.
+two adjacent cells can differ (e.g. 0.3 means 30%).
+- Nb. Segs per Edge - allows to define the minimum number of
+mesh segments in which edges will be split. This parameter is used
+only if Limit Size by Surface Curvature is checked.
+- Nb Segs per Radius - allows to define the size of
+mesh segments and mesh faces in which curved edges and surfaces will
+be split. This value divided by a radius of curvature gives an element
+size at a given point. This parameter is used only if Limit Size by
+ Surface Curvature is checked.
+- Limit Size by Surface Curvature - if this box is checked in,
+then size of mesh segments and mesh faces on curved edges and surfaces
+is defined using value of Nb Segs per Radius parameter, and
+number of segments on straight edges is defined by values of
+Nb. Segs per Edge parameter. If this box is not checked in,
+then size of elements is defined by three parameters only:
+Max Size, Min Size and Growth rate.
+- Allow Quadrangles - if this box is checked in, the mesher
+tries to generate quadrangle 2D mesh. Triangle elements are created
+where quadrangles are not possible.
+- Optimize - if this box is checked in, the algorithm will modify
+initially created mesh in order to improve quality of elements. Optimization
+process is rather time consuming comparing to creation of initial mesh.
+- Fuse Coincident Nodes on Edges and Vertices - allows merging
+mesh nodes on vertices and edges which are geometrically coincident
+but are topologically different.
\image html netgen3d_local_size.png
@@ -60,42 +75,34 @@ dimension.
\b 1D group allows defining the size of 1D elements in either of two ways:
- Number of Segments allows specifying number of segments, that
will split each edge, with equidistant distribution.
-- Local Length can be applied for meshing of edges
-composing geometrical object. Definition of this hypothesis
-consists of setting required \b length of segments.
+- Local Length defines length of segments.
\b 2D group allows defining the size of 2D elements
-- Length from edges if checked in, hypothesis forces building of
-2D mesh segments having a length calculated as an average edge length
+- Length from edges if checked in, size of
+2D mesh elements is defined as an average mesh segment length
for a given wire, else
- Max. Element Area specifies expected maximum element area for
each 2d element.
-- Allow Quadrangles - allows to use quadrangle elements in a
-triangle 2D mesh. This checkbox is not present in Netgen 3D simple parameters
-because currently building a tetrahedral mesh with quadrangle faces is
-not possible.
+- Allow Quadrangles - allows to generate quadrangle elements
+wherever possible.
\b 3D groups allows defining the size of 3D elements.
- Length from faces if checked in, the area of sides of
volumic elements will be equal to an average area of 2D elements, else
- Max. Element Volume specifies expected maximum element volume
-of each 3d element.
+of 3d elements.
\note Netgen algorithm does not strictly follow the input
parameters. The actual mesh can be more or less dense than
required. There are several factors in it:
-- NETGEN does not actually use "NbOfSegments" parameter for discretization of
-edge. This parameter is used only to define the local element size
-(size at the given point), so local sizes of adjacent edges influence
-each other.
+- NETGEN does not actually use Number of Segments parameter for
+discretization of edge. This parameter is used only to define the
+local element size (size at the given point), so local sizes of
+close edges influence each other.
- NETGEN additionally restricts the element size according to edge curvature.
-- The local size of edges influences the size of close triangles.
+- The local size of segments influences the size of close triangles.
- The order of elements and their size in the 1D mesh generated by
NETGEN differ from those in the 1D mesh generated by Regular_1D
algorithm, resulting in different 2D and 3D meshes.
-\note In the case where two points are geometrically confounded, a single node is generated.
-
*/
-
-