smesh/doc/salome/gui/SMESH/files/about_hypotheses.htm

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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.
 </p>

<p>&nbsp;</p>

<p>In <span style="font-weight: bold;"><B>MESH </B></span>there are the following
 Basic Hypotheses (to introduce them, you operate numerical values):</p>

<ul type="disc" class="whs2">

	<li style="list-style: circle; /*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
		type=circle
		class=kadov-p><p class="whs3"><a href="arithmetic_1d.htm">1D Hypotheses</a> (for meshing of <span style="font-weight: bold;"><B>edges)</B></span>:</p></li>

	<ul type="disc" class="whs2">

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3">Arithmetic
 1D</p></li>

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3">Average
 Length</p></li>

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3">Deflection
 1D </p></li>

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3">Number
 of segments</p></li>

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3">Start
 and end length</p></li>
	</ul>

	<li style="list-style: circle; /*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
		type=circle
		class=kadov-p><p class="whs3">2D
 Hypothesis (for meshing of <span style="font-weight: bold;"><B>faces)</B></span>:
 </p></li>
</ul>

<ul type="disc" class="whs2">

	<ul type="disc" class="whs2">

		<li style="/*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
			class=kadov-p><p class="whs3"><a href="max._element_area_hypothesis.htm">Max Element Area</a></p></li>
	</ul>
</ul>

<ul type="disc" class="whs2">

	<li style="list-style: circle; /*begin!kadov{{*/ color: #000000; /*}}end!kadov*/ "
		type=circle
		class=kadov-p><p class="whs3">3D
 Hypothesis (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></p></li>
	</ul>
</ul>

<p>&nbsp;</p>

<p>There also exist some <a href="non_conform_mesh_allowed_hypothesis.htm">Additional
 Hypotheses</a></p>

<ol type="disc" class="whs4">

	<ul type="disc" class="whs2">

		<li class=kadov-p><p>Propagation of 1D Hypothesis on opposite edges</p></li>

		<li class=kadov-p><p>Length from edges</p></li>

		<li class=kadov-p><p>Non conform mesh allowed</p></li>
	</ul>
</ol>

<p>&nbsp;</p>

<p>The choice of a hypothesis depends on:</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>&nbsp;</p>

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