mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
synced 2024-11-14 17:48:34 +05:00
106 lines
4.4 KiB
Plaintext
106 lines
4.4 KiB
Plaintext
/*!
|
|
|
|
\page additional_hypo_page Additional Hypotheses
|
|
|
|
\n <b>Additional Hypotheses</b> can be applied as a supplement to the
|
|
main hypotheses, introducing additional concepts to mesh creation.
|
|
|
|
To define an <b>Additional Hypothesis</b> simply select it in
|
|
<b>Create Mesh</b> menu. These hypotheses are actually changes in the
|
|
rules of mesh creation and as such don't possess adjustable values.
|
|
|
|
\anchor non_conform_allowed_anchor
|
|
<h2>Non Conform mesh allowed hypothesis</h2>
|
|
|
|
<b>Non Conform mesh allowed</b> hypothesis allows to generate non-conform
|
|
meshes (that is, meshes having some edges ending on an edge or face of
|
|
adjacent elements).
|
|
|
|
\anchor quadratic_mesh_anchor
|
|
<h2>Quadratic Mesh</h2>
|
|
|
|
Quadratic Mesh hypothesis allows to build a quadratic mesh (whose
|
|
edges are not straight but curved lines and can be defined by three
|
|
points: first, middle and last instead of an ordinary two).
|
|
|
|
See \ref adding_quadratic_elements_page
|
|
for more information about quadratic meshes.
|
|
|
|
\anchor propagation_anchor
|
|
<h2>Propagation of 1D Hypothesis on opposite edges</h2>
|
|
|
|
<b>Propagation of 1D Hypothesis on opposite edges</b> allows to propagate a
|
|
hypothesis onto an opposite edge. If a local hypothesis and
|
|
propagation are defined on an edge of a quadrangular face, the
|
|
opposite edge will have the same hypothesis, unless another hypothesis
|
|
has been locally defined on the opposite edge.
|
|
|
|
<br><b>See Also</b> a sample TUI Script of a
|
|
\ref tui_propagation "Propagation hypothesis" operation
|
|
|
|
\anchor quadrangle_preference_anchor
|
|
<h2>Quadrangle Preference</h2>
|
|
|
|
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When used with "Quadrangle (Mapping)" meshing algorithm, that is obsolete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).
|
|
|
|
\anchor viscous_layers_anchor
|
|
<h2>Viscous Layers and Viscous Layers 2D</h2>
|
|
|
|
<b>Viscous Layers</b> and <b>Viscous Layers 2D </b> additional
|
|
hypotheses can be used together with either some 3D algorithms, for example
|
|
Hexahedron(i,j,k), or 2D algorithms, for example Triangle
|
|
(MEFISTO), correspondingly. These hypotheses allow creation of layers
|
|
of highly stretched elements, prisms in 3D and quadrilaterals in 2D,
|
|
near mesh boundary, which is beneficial for high quality viscous
|
|
computations.
|
|
|
|
\image html viscous_layers_hyp.png
|
|
|
|
<ul>
|
|
<li><b>Name</b> - allows to define the name of the hypothesis.</li>
|
|
<li><b>Total thickness</b> - gives the total thickness of element layers.</li>
|
|
<li><b>Number of layers</b> - defines the number of element layers.</li>
|
|
<li><b>Stretch factor</b> - defines the growth factor of element height
|
|
from the mesh boundary inwards.</li>
|
|
<li><b>Specified Edges are</b> - defines how the shapes specified by
|
|
the next parameter are used.
|
|
<li><b>Faces without layers</b> and <b>Edges with/without layers</b> -
|
|
in the 3D case it defines geometrical faces on which element layers
|
|
should not be constructed; in the 2D case it defines geometrical edges
|
|
on which element layers either should be or should not be
|
|
constructed, depending on the value of the previous parameter
|
|
(<b>Specified Edges are</b>).
|
|
\note A mesh shown in the 3D Viewer can prevent selection of faces
|
|
and edges, just hide the mesh to avoid this. 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
|
|
preview chunk size" preference (in Preferences/Mesh/General tab).<br>
|
|
|
|
Whatever shapes are specified by this
|
|
parameter, the element layers are not constructed on geometrical
|
|
faces shared by several solids in 3D case and edges shared by
|
|
several faces in 2D case. In other words the element layers can be
|
|
constructed on boundary faces and edges, and are not constructed on
|
|
internal faces and edges. There is an exception to this rule in 2D
|
|
case: if "Viscous Layers 2D" hypothesis is assigned to a sub-mesh,
|
|
the element layers can be constructed on boundary edges of the shape
|
|
of this sub-mesh.
|
|
\image html viscous_layers_on_submesh.png 2D viscous layers constructed on boundary edges of a sub-mesh on a disk face.
|
|
|
|
</li>
|
|
</ul>
|
|
|
|
\image html viscous_layers_mesh.png A group containing viscous layer prisms.
|
|
|
|
<br><b>See also</b> a sample TUI script of a \ref tui_viscous_layers
|
|
"Viscous layers construction".
|
|
|
|
|
|
*/
|