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191 lines
7.1 KiB
HTML
Executable File
191 lines
7.1 KiB
HTML
Executable File
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<html>
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<title>Smoothing</title>
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</script>
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<h1>Smoothing</h1>
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<p><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs1"> Smoothing is used to adjust the locations of element
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corners (nodes) to reduce distortions in these elements.</p>
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<p> </p>
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<p class=TODO>To apply smoothing to the elements of your mesh:</p>
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<p> </p>
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<p class="whs2">1. Display a mesh or a submesh in the 3D
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viewer.</p>
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<p class="whs2">2. In the <span style="font-weight: bold;"><B>Modification
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</B></span>menu select the <span style="font-weight: bold;"><B>Smoothing </B></span>item
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or click <img src="../image84.gif" width="24px" height="25px" border="0" class="img_whs3"> button in the toolbar. The <span style="margin-left: 40px;">dialog
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box contains the following fields which should be specified:</span></p>
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<p> </p>
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<p class="whs2"><img src="../pics/smoothing.png" x-maintain-ratio="TRUE" width="332px" height="396px" border="0" class="img_whs4"> </p>
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<ul type="disc" class="whs5">
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<li class=kadov-p><p class="whs6"><span
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style="font-weight: bold;"><B>Id Elements </B></span><span>field allows to specify
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the elements which should be smoothed by selecting them in the 3D viewer.
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Note: to select several elements press </span><span style="font-weight: bold;"><B>Shift
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</B></span><span>button.</span></p></li>
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<ul type="disc" class="whs5">
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<li class=kadov-p><p class="whs7">Smoothing is applied
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to the whole mesh or its part</p></li>
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Fixed nodes
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ids</B></span>: some nodes keep their location during smoothing. If a mesh
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is built on a geometry shape, the nodes built on geometrical edges are
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always fixed. If smoothing is applied to a part of a mesh then the boundary
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nodes of an elements set are also fixed. Any other nodes may be additionally
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fixed.</p></li>
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Smoothing
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method</B></span>:</p></li>
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<ul type="disc" class="whs5">
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Laplacian</B></span>
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smoothing pulls a node toward the center of surrounding nodes directly
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connected to that node along an element edge. Centroidal smoothing pulls
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a node toward the element-area-weighted centroid of the surrounding elements.
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Typically, the Laplacian method will produce the mesh with the least element
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distortion. It is also the faster method. </p></li>
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<li class=kadov-p><p><span style="font-weight: bold;"><B>Centroidal</B></span>
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smoothing usually produces a mesh that has more uniform element sizes.
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Both methods produce good results with "free" meshes.</p></li>
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</ul>
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</ul>
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</ul>
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<p> </p>
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<p class="whs8"><img src="../image83.gif" width="527px" height="281px" border="0" class="img_whs9"></p>
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<ul type="disc" class="whs5">
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<li class=kadov-p><p class="whs6"><span
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style="font-weight: bold;"><B>Iteration limit: </B></span>both of the smoothing
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methods use an iterative procedure to converge toward a smoothed mesh.
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All nodes are smoothed according to one of the techniques shown above.
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Then the smoothing is reevaluated with the updated nodal locations. This
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process continues until the maximum number of iterations has been exceeded,
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or all elements has aspect ratio less or equal than the specified one.</p></li>
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<li class=kadov-p><p class="whs6"><span
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style="font-weight: bold;"><B>Max. aspect ratio</B></span>.</p></li>
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</ul>
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<p class="whs2"> </p>
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<p class="whs2">3. Click the <span style="font-weight: bold;"><B>Apply
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</B></span>or <span style="font-weight: bold;"><B>OK </B></span>button to confirm
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the operation.</p>
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<p class="whs2"> </p>
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<p class="whs2"><img src="../pics/smoothing1.png" x-maintain-ratio="TRUE" width="353px" height="235px" border="0" class="img_whs10"> <img src="../pics/smoothing2.png" x-maintain-ratio="TRUE" width="351px" height="235px" border="0" class="img_whs11"></p>
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<p> </p>
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<p> <span style="font-weight: bold;"><B>See
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Also</B></span> a sample TUI Script of a <a href="../modifying_meshes.htm#bookmark8">Smoothing</a>
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operation. </p>
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<p> </p>
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<p> </p>
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