X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2F1d_meshing_hypo.doc;h=6ba10611e7be1dfa8f24f37d0a3c4ef1be2ae17a;hb=1667ba5bf57334ab6f83c58fcaae6a5b47a31b64;hp=b992bc8e2e2d53ed1299e360af991aa6798b3e0a;hpb=5d68554076bbca0e1e95fb0db215a6c2b84b6c54;p=modules%2Fsmesh.git diff --git a/doc/salome/gui/SMESH/input/1d_meshing_hypo.doc b/doc/salome/gui/SMESH/input/1d_meshing_hypo.doc index b992bc8e2..6ba10611e 100644 --- a/doc/salome/gui/SMESH/input/1d_meshing_hypo.doc +++ b/doc/salome/gui/SMESH/input/1d_meshing_hypo.doc @@ -35,7 +35,7 @@ creation of narrow 2D elements. \image html adaptive1d_sample_mesh.png "Adaptive hypothesis and Netgen 2D algorithm - the size of mesh segments reflects the size of geometrical features" -See Also a \ref tui_1d_adaptive "sample TUI Script" that creates mesh of the above image. +See Also a \ref tui_1d_adaptive "sample TUI Script" that uses Adaptive hypothesis.
\anchor arithmetic_1d_anchor @@ -45,11 +45,15 @@ creation of narrow 2D elements. length that changes in arithmetic progression (Lk = Lk-1 + d) beginning from a given starting length and up to a given end length. -The direction of the splitting is defined by the orientation of the underlying geometrical edge. -"Reverse Edges" list box allows to specify the edges for which the splitting should be made -in the direction opposing to their orientation. This list box is enabled only if the geometry object -is selected for the meshing. In this case the user can select edges to be reversed either directly -picking them in the 3D viewer or by selecting the edges or groups of edges in the Object Browser. +The splitting direction is defined by the orientation of the +underlying geometrical edge. +Reverse Edges list box allows specifying the edges, for which +the splitting should be made in the direction opposite to their +orientation. This list box is usable only if a geometry object is +selected for meshing. In this case it is possible to select edges to +be reversed either directly picking them in the 3D viewer or by +selecting the edges or groups of edges in the Object Browser. Use \b +Add button to add the selected edges to the list. \image html a-arithmetic1d.png @@ -62,19 +66,20 @@ picking them in the 3D viewer or by selecting the edges or groups of edges in th \anchor geometric_1d_anchor

Geometric Progression hypothesis

-Geometric Progression hypothesis allows to split edges into +Geometric Progression hypothesis allows splitting edges into segments with a length that changes in geometric progression (Lk = -Lk-1 * d) beginning from a given starting length and with a given -common ratio. +Lk-1 * d) starting from a given Start Length and with a given +Common Ratio. -The direction of the splitting is defined by the orientation of the -underlying geometrical edge. "Reverse Edges" list box allows to -specify the edges for which the splitting should be made in the -direction opposing to their orientation. This list box is enabled only -if the geometry object is selected for the meshing. In this case the -user can select edges to be reversed either directly picking them in -the 3D viewer or by selecting the edges or groups of edges in the -Object Browser. +The splitting direction is defined by the orientation of the +underlying geometrical edge. +Reverse Edges list box allows specifying the edges, for which +the splitting should be made in the direction opposite to their +orientation. This list box is usable only if a geometry object is +selected for meshing. In this case it is possible to select edges to +be reversed either directly picking them in the 3D viewer or by +selecting the edges or groups of edges in the Object Browser. Use \b +Add button to add the selected edges to the list. \image html a-geometric1d.png @@ -159,11 +164,14 @@ edges generated by these segments will represent nodes of your mesh. Later these nodes will be used for meshing of the faces abutting to these edges. -The direction of the splitting is defined by the orientation of the underlying geometrical edge. -"Reverse Edges" list box allows to specify the edges for which the splitting should be made -in the direction opposing to their orientation. This list box is enabled only if the geometry object -is selected for the meshing. In this case the user can select edges to be reversed either directly -picking them in the 3D viewer or by selecting the edges or groups of edges in the Object Browser. +The direction of the splitting is defined by the orientation of the +underlying geometrical edge. "Reverse Edges" list box allows to +specify the edges for which the splitting should be made in the +direction opposing to their orientation. This list box is enabled only +if the geometry object is selected for the meshing. In this case it is +possible to select edges to be reversed either by directly picking them +in the 3D viewer or by selecting the edges or groups of edges in the +Object Browser. \image html image46.gif @@ -175,28 +183,48 @@ You can set the type of distribution for this hypothesis in the
Equidistant Distribution - all segments will have the same length, you define only the Number of Segments. -
Scale Distribution - length of segments gradually changes depending on the Scale Factor, which is a ratio of the first segment length to the last segment length. +
Scale Distribution - length of segments gradually changes +depending on the Scale Factor, which is a ratio of the first +segment length to the last segment length.
+Length of segments changes in geometric progression with the common +ratio (A) depending on the Scale Factor (S) and Number of +Segments (N) as follows: A = S**(1/(N-1)). For an +edge of length L, length of the first segment is +L * (1 - A)/(1 - A**N). -\image html a-nbsegments2.png -
Distribution with Table Density - you input a number of -pairs t - F(t), where \b t ranges from 0 to 1, and the module computes the -formula, which will rule the change of length of segments and shows -the curve in the plot. You can select the Conversion mode from -\b Exponent and Cut negative. - -\image html distributionwithtabledensity.png +\image html a-nbsegments2.png
Distribution with Analytic Density - you input the formula, which will rule the change of length of segments and the module shows -the curve in the plot. +in the plot the density function curve in red and the node +distribution as blue crosses. \image html distributionwithanalyticdensity.png +
+\anchor analyticdensity_anchor +The node distribution is computed so that to have the density function +integral on the range between two nodes equal for all segments. +\image html analyticdensity.png + +
Distribution with Table Density - you input a number of +pairs t - F(t), where \b t ranges from 0 to 1, and the module computes the +formula, which will rule the change of length of segments and shows +in the plot the density function curve in red and the node +distribution as blue crosses. The node distribution is computed in the +same way as for +\ref analyticdensity_anchor "Distribution with Analytic Density". You +can select the Conversion mode from\b Exponent and Cut +negative. + +\image html distributionwithtabledensity.png + See Also a sample TUI Script of a \ref tui_deflection_1d "Defining Number of Segments" hypothesis operation. +
\anchor start_and_end_length_anchor

Start and End Length hypothesis

@@ -208,11 +236,14 @@ geometric progression. Then mesh nodes are constructed at segment ends location and 1D mesh elements are constructed on them. -The direction of the splitting is defined by the orientation of the underlying geometrical edge. -"Reverse Edges" list box allows to specify the edges for which the splitting should be made -in the direction opposing to their orientation. This list box is enabled only if the geometry object -is selected for the meshing. In this case the user can select edges to be reversed either directly -picking them in the 3D viewer or by selecting the edges or groups of edges in the Object Browser. +The direction of the splitting is defined by the orientation of the +underlying geometrical edge. "Reverse Edges" list box allows to +specify the edges, for which the splitting should be made in the +direction opposing to their orientation. This list box is enabled only +if the geometry object is selected for the meshing. In this case it is +possible to select edges to be reversed either by directly picking them +in the 3D viewer or by selecting the edges or groups of edges in the +Object Browser. \image html a-startendlength.png @@ -226,15 +257,14 @@ hypothesis operation. \anchor automatic_length_anchor

Automatic Length

-This hypothesis is automatically applied when you select Assign a -set of hypotheses option in Create Mesh menu. - -\image html automaticlength.png - The dialog box prompts you to define the quality of the future mesh by only one parameter, which is \b Fineness, ranging from 0 (coarse mesh, low number of elements) to 1 (extremely fine mesh, great number of -elements). Compare one and the same object (sphere) meshed with +elements). + +\image html automaticlength.png + +Compare one and the same object (sphere) meshed with minimum and maximum value of this parameter. \image html image147.gif "Example of a very rough mesh. Automatic Length works for 0."