<h2>Propagation of 1D Hypothesis on opposite edges</h2>
<b>Propagation of 1D Hypothesis on opposite edges</b> allows to mesh
-opposite sides of a quadrangle face, and of other adjacent quadrangles,
-using the same hypothesis assigned to one edge only.<br>
-Thus you define a sub-mesh on an edge where you define 1D meshing
-parameters and a \b Propagation hypothesis. These local meshing
+opposite sides of a quadrangle face and other adjacent quadrangles,
+using the same hypothesis assigned to only one edge.<br>
+Thus you define a sub-mesh on the edge where you define 1D meshing
+parameters and the \b Propagation hypothesis. These local meshing
parameters will be propagated via opposite sides of quadrangles to the
-whole geometry, or till an edge with other local meshing parameters.
+whole geometry, and this propagation stops at an edge with other local
+meshing parameters.
This hypothesis can be taken into account by
\ref a1d_algos_anchor "Wire Discretization" and
<li><b>Stretch factor</b> - defines the growth factor of element height
from the mesh boundary inwards.</li>
<li><b>Extrusion method</b> (available in 3D only) - defines how
- position of nodes are found during prism construction and how
- creation of distorted and intersecting prisms is prevented.
-<ul><li><b>Surface offset + smooth</b> method extrudes nodes along normal
- to underlying geometrical surface. Smoothing of internal surface of
+ positions of nodes are found during prism construction and how
+ the creation of distorted and intersecting prisms is prevented.
+<ul><li><b>Surface offset + smooth</b> method extrudes nodes along the normal
+ to the underlying geometrical surface. Smoothing of the internal surface of
element layers is possible to avoid creation of invalid prisms.</li>
- <li><b>Face offset</b> method extrudes nodes along average normal of
- surrounding mesh faces till intersection with a neighbor mesh face
- translated along its own normal by the layers thickness. Thickness
+ <li><b>Face offset</b> method extrudes nodes along the average normal of
+ surrounding mesh faces to the intersection with a neighbor mesh face
+ translated along its own normal by the thickness of layers. The thickness
of layers can be limited to avoid creation of invalid prisms.</li>
- <li><b>Node offset</b> method extrudes nodes along average normal of
- surrounding mesh faces by the layers thickness. Thickness of
+ <li><b>Node offset</b> method extrudes nodes along the average normal of
+ surrounding mesh faces by the thickness of layers. The thickness of
layers can be limited to avoid creation of invalid prisms.</li>
\image html viscous_layers_extrusion_method.png "Prisms created by the tree extrusion methods at the same other parameters"
</ul></li>
Faces (or edges) can be selected either in the Object Browser or in
the VTK Viewer.
\note A mesh shown in the 3D Viewer can prevent selection of faces
- and edges, just hide the mesh to avoid this. Sometimes a face to
- select is hidden by other faces, in this case consider creating a
- group of faces you want to select in the Geometry module.<br>
+ and edges, just hide the mesh to avoid this. If a face, which should be
+ selected, is hidden by other faces, consider creating a
+ group of faces to be selected in the Geometry module.<br>
To avoid a long wait when a
geometry with many faces (or edges) is displayed, the number of faces
(edges) shown at a time is limited by the value of "Sub-shapes
Quadratic Mesh hypothesis allows to build a quadratic mesh (in which
links between element nodes are not straight but curved lines due to
-presence of an additional midside node).
+presence of an additional mid-side node).
This 1D hypothesis can be taken into account by
\ref a1d_algos_anchor "Wire Discretization" and
\ref a1d_algos_anchor "Composite Side Discretization" algorithms. To
-make a quadratic mesh assign this hypothesis at
+create a quadratic mesh assign this hypothesis at
\ref constructing_meshes_page "mesh construction".
See \ref adding_quadratic_elements_page
This additional hypothesis can be used together with 2D triangulation algorithms.
It allows 2D triangulation algorithms to build quadrangular meshes.
-When used with "Quadrangle (Mapping)" meshing algorithm, that is obsolete
- since introducing \ref hypo_quad_params_anchor "Quadrangle parameters"
-hypothesis, this hypothesis has one restriction on its work: the total quantity of
-segments on all four sides of the face must be even (divisible by 2).
-
+Usage of this hypothesis with "Quadrangle (Mapping)" meshing algorithm
+is obsolete since introducing
+\ref hypo_quad_params_anchor "Quadrangle parameters" hypothesis.
+Usage of this hypothesis with "Quadrangle (Mapping)" meshing algorithm
+corresponds to specifying "Quadrangle Preference" transition type of
+\ref hypo_quad_params_anchor "Quadrangle parameters" hypothesis.
+\note "Quadrangle Preference" transition type can be used only if the
+total quantity of segments on all sides of the face is even (divisible
+by 2), else "Standard" transition type is used.
*/
