smesh/doc/salome/gui/SMESH/files/about_hypotheses.htm
2004-12-01 10:48:31 +00:00

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<title>About hypotheses</title>
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<h1>About hypotheses</h1>
<p><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs1"> <span style="font-weight: bold;"><B>Hypotheses</B></span> represent
boundary conditions which will be taken into account at calculations of
meshes or submeshes basing on geometrical objects. These hypotheses allow
you to manage the level of detail of the resulting meshes or submeshes:
when applying different hypotheses with different parameters you can preset
the quantity of meshing elements which will compose your mesh. So, it
will be possible to generate a rough or a more refined mesh or submesh.
In <span style="font-weight: bold;"><B>SMESH </B></span>there are the following
basic hypotheses:</p>
<p>&nbsp;</p>
<ul type="disc" class="whs2">
<li style="list-style: circle;"
type=circle
class=kadov-p><p class="whs3">For
meshing of <span style="font-weight: bold;"><B>edges</B></span>:</p></li>
<ul type="disc" class="whs2">
<li class=kadov-p><p class="whs3"><a href="arithmetic_1d.htm">Arithmetic 1D</a></p></li>
<li class=kadov-p><p class="whs3"><a href="local_length_hypothesis.htm">Average Length</a></p></li>
<li class=kadov-p><p class="whs3"><a href="deflection_1d.htm">Deflection 1D</a> </p></li>
<li class=kadov-p><p class="whs3"><a href="number_of_segments_hypothesis.htm">Number of segments</a></p></li>
<li class=kadov-p><p class="whs3"><a href="propagation_of_1d_hypothesis_on_opposite_edges.htm">Propagation
of 1D Hypothesis on opposite edges</a></p></li>
<li class=kadov-p><p class="whs3"><a href="start_and_end_length_hypothesis.htm">Start and end length</a></p></li>
</ul>
<li style="list-style: circle;"
type=circle
class=kadov-p><p class="whs3">For
meshing of <span style="font-weight: bold;"><B>faces</B></span>: </p></li>
</ul>
<ol type="disc" class="whs4">
<ul type="disc" class="whs2">
<li class=kadov-p><p class="whs3"><a href="length_from_edges.htm">Length from edges</a></p></li>
<li class=kadov-p><p class="whs3"><a href="max._element_area_hypothesis.htm">Max Element Area</a></p></li>
<li class=kadov-p><p class="whs3"><a href="non_conform_mesh_allowed_hypothesis.htm">Non conform mesh allowed</a></p></li>
</ul>
</ol>
<ul type="disc" class="whs2">
<li style="list-style: circle;"
type=circle
class=kadov-p><p class="whs3">For
meshing of <span style="font-weight: bold;"><B>volumes</B></span>: </p></li>
<ul type="disc" class="whs2">
<li class=kadov-p><p><a href="max._element_volume_hypothsis.htm">Max
Element Volume</a> &nbsp;</p></li>
</ul>
</ul>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>The choice of a hypothesis depends on:</p>
<p>&nbsp;</p>
<ul type="disc" class="whs2">
<li class=kadov-p><p>the geometrical object (shape) which will be meshed</p></li>
<li class=kadov-p><p>the algorithm, which will be selected for meshing
of this geometrical object (shape)</p></li>
</ul>
<p>&nbsp;</p>
<p class="whs5"><a name=CreateHyp></a>To
create a hypothesis </p>
<p><span style="font-size: 12pt;"><font size=3 style="font-size:12pt;">In the main menu select</font></span><span style="font-style: italic;
font-size: 12pt;
font-family: 'Arial Black', sans-serif;"> <font size=3 style="font-size:12pt;"><I></I></font></span><span style="font-weight: bold;"><B>Hypotheses
&gt; </B></span><img src="../image7.gif" width="22px" height="22px" border="0" class="img_whs6"> <span style="font-weight: bold;"><B>Create hypotheses</B></span></p>
<p>The following menu will appear:</p>
<p>&nbsp;</p>
<p class="whs7"><img src="../image21.jpg" width="448px" height="367px" border="0" class="img_whs8"></p>
<p>&nbsp;</p>
<p>Select one of the menu items and click <span style="font-weight: bold;"><B>Create</B></span>.
A data input dialog box corresponding to the chosen type of the hypotheses
will appear. The created hypotheses shall appear in the Object Browser
under the <span style="font-weight: bold;"><B>Hypotheses </B></span>folder:</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p class="whs7"><img src="../image42.jpg" width="271px" height="124px" border="0" class="img_whs9"></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
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