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https://git.salome-platform.org/gitpub/modules/smesh.git
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218 lines
7.2 KiB
HTML
218 lines
7.2 KiB
HTML
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<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
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<html>
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<!--(Document created with RoboEditor. )============================-->
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<head>
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<title>Smoothing</title>
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<meta http-equiv=content-type content="text/html; charset=windows-1252">
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<meta name=generator content="RoboHELP by eHelp Corporation - www.ehelp.com">
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<meta name=page-count content=1>
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<meta name=layout-height content=1451>
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<meta name=layout-width content=740>
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<!--(Links)=========================================================-->
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<link rel='stylesheet' href='../default_ns.css'>
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<script type="text/javascript" language="JavaScript" title="WebHelpSplitCss">
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if (navigator.appName !="Netscape")
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{ document.write("<link rel='stylesheet' href='../default.css'>");}
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//-->
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<style type="text/css">
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img_whs1 {border-style: none; border: none; width: 30px; height: 30px; float: none;}
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</style>
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function reDo() {
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if (innerWidth != origWidth || innerHeight != origHeight)
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location.reload();
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}
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if ((parseInt(navigator.appVersion) == 4) && (navigator.appName == "Netscape")) {
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onerror = null;
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//-->
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</script>
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<style type="text/css">
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div.WebHelpPopupMenu {position:absolute; left:0px; top:0px; z-index:4; visibility:hidden;}
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</style>
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<script type="text/javascript" language="javascript1.2" src="../whmsg.js"></script>
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<script type="text/javascript" language="javascript" src="../whver.js"></script>
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<script type="text/javascript" language="javascript1.2" src="../whproxy.js"></script>
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<script type="text/javascript" language="javascript1.2" src="../whutils.js"></script>
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<script type="text/javascript" language="javascript1.2" src="../whtopic.js"></script>
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</head>
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<body>
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<script type="text/javascript" language="javascript1.2">
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if (window.gbWhTopic)
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{
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if (window.addTocInfo)
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{
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addTocInfo("SMESH module\nModifying meshes\nSmoothing");
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addButton("show",BTN_TEXT,"Show","","","","",0,0,"","","");
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else
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document.location.reload();
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//-->
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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 class=TODO> </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"> </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 following dialog box
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will appear:</p>
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<p> </p>
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<p class="whs2"><img src="../image85.gif" width="319px" height="369px" border="0" class="img_whs4"></p>
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<p class="whs2"> </p>
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<p class="whs2">This dialog box contains the following fields
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which should be specified:</p>
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<p> </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> </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 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> </p>
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<p> </p>
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<p> </p>
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<script type="text/javascript" language="javascript1.2">
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if (window.writeIntopicBar)
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writeIntopicBar(0);
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</script>
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</body>
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</html>
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