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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.2 Final//FR"><!-- Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) --><!-- by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><!-- Modified Simulog 03/97 --><HTML><HEAD><TITLE>2.2 Two-dimensional meshes TRNOXX</TITLE><LINK REL=STYLESHEET TYPE="text/css" HREF="./Modulef.css" TITLE="Modulef CSS"><meta name="description" value="2.2 Two-dimensional meshes TRNOXX"><meta name="keywords" value="Guide6"><meta name="resource-type" value="document"><meta name="distribution" value="global"></HEAD><BODY BGCOLOR="#FFFFFF"><P> <IMG SRC="../icons/smallmod.gif" WIDTH=211 HEIGHT=50 ALIGN=BOTTOM ALT="Modulef"><A NAME=tex2html906 HREF="node35.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/previous_motif.gif" ALT="previous"></A><A NAME=tex2html912 HREF="node34.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/up_motif.gif" ALT="up"></A><A NAME=tex2html914 HREF="node37.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/next_motif.gif" ALT="next"></A><A NAME=tex2html916 HREF="node2.html"><IMG BORDER=0 ALIGN=BOTTOM SRC="../icons/contents_motif.gif" ALT="contents"></A><A HREF="../Guide6-18/node36.html"><IMG BORDER=0 SRC="../icons/zoom18.gif" ALIGN=BOTTOM ALT="[BIG]"></A><A HREF="../Guide6-14/node36.html"><IMG BORDER=0 SRC="../icons/zoom14.gif" ALIGN=BOTTOM ALT="[Normal]"></A><A HREF="../Guide6-10/node36.html"><IMG BORDER=0 SRC="../icons/zoom10.gif" ALIGN=BOTTOM ALT="[small]"></A><BR><B> Next: </B> <A NAME=tex2html915 HREF="node37.html">2.3 Three-dimensional meshes TRNOXX</A><B>Up: </B> <A NAME=tex2html913 HREF="node34.html">2 Visualization of meshes</A><B> Prev: </B> <A NAME=tex2html907 HREF="node35.html">3.1 Introduction</A><B><A HREF="node2.html" >Contents</A></B><HR SIZE=3 WIDTH="75%"><H1><A NAME=SECTION04320000000000000000>2.2 Two-dimensional meshes TRNOXX</A></H1> <A NAME=2d> </A><P><P><P><H2><A NAME=SECTION04321000000000000000>2.2.1 Aim and utilization limits</A></H2><P><P><P>Preprocessor <b> TRNOXX</b> is used to visualize meshes (the two-dimensional case is described here). In thecase of an elasticity problem for which the displacements are known, we can also visualizethe deformed mesh with <b> TRNOXX</b> (the displacements, multiplied by a given factor, are added to the nodes inthe initial mesh).<P><DL COMPACT><DT>Note:<DD> The visualization of deformations are only possible in the following cases:<P><UL><LI> the finite elements are of type Lagrange,<LI> the displacements are the NDIM (2 here) first degrees of freedom of each node,<LI> <IMG BORDER=0 ALIGN=MIDDLE ALT="" SRC="img39.gif"> where ND is the number of degrees of freedom per node.</UL><P>For other cases, preprocessor <b> TRMCXX</b>, requiring data structures <b> MAIL</b> and <b> COOR</b>, is used.<P> </DL><P><P><P><H2><A NAME=SECTION04322000000000000000>2.2.2 Utilization of TRNOXX (2D)</A></H2><P><P><P><OL><LI> Activate preprocessor <b> TRNOXX</b>.<P><LI> Choose the output terminal.<P><LI> Input the name of the file containing the mesh.<P><LI> The general menu is displayed (see further down).<P><LI> Type 0 to obtain an automatic plot.<P><LI> To obtain the values of the visualization parameters, type V.<P><LI> Modify these values, if necessary, by choosing the corresponding key and entering the required information.Once the desired state is obtained, type 0 to display the plot.<P><LI> A <i> graphics</i> menu is displayed on the plot to perform modifications, to exit or to return to themenu mentioned above and described in the coming sections.</OL><P><P><P><H2><A NAME=SECTION04323000000000000000>2.2.3 Complete description of TRNOXX (2D)</A></H2><P><P><P>In practice, having input the output terminal and the file containing the mesh, we need tospecify the choices made from the different possibilities offered by the module.<P>The module automatically calculates the extrema corresponding to the mesh treated todefine the corners of the box in which the plot is displayed.<P>The general menu of TRNOPO (module called in this case) is shown below:<P><PRE> ------------------------------------------------------------ | 10 | PLOT TYPE | MESH ONLY ------------------------------------------------------------ | 11 | DEVICE NUMBER | 1 ------------------------------------------------------------ | 20 | MESH TO PLOT | carre.nopo ------------------------------------------------------------ | 31 | QUESTIONS ABOUT THIS MESH | NO ------------------------------------------------------------ | 30 | PLOT SIZE | AUTO ------------------------------------------------------------ | 40 | CHARACTER TYPE | HARD ------------------------------------------------------------ | 50 | ITEMS TO BE PLOTTED | TRIANGULATION ------------------------------------------------------------ | 60 | LEGEND | YES ------------------------------------------------------------ | 70 | NUMBER | NONE ------------------------------------------------------------ | 80 | LINE TYPE | SOLID ------------------------------------------------------------</PRE><P>A default value is proposed for each option. The above table lists theautomatic, or default, selections.To obtain the plot corresponding to the above status, type 0.<P>A key (a number) and a status corresponds to each item. To modify the status, it suffices to type thekey and enter (see general introduction) the values corresponding to the status desired. The list of keys isas follows:<P><DL COMPACT><DT>Key 10:<DD> the plot type: mesh only (default choice); we can also request to visualize a mesh and its deformation: type 10 after which the program requests the name of the file containing data structure <b> B</b> of displacements.A number of additional lines then appears on the general menu (see below).<DT>Key 11:<DD> the device number.<DT>Key 20:<DD> the name of the file containing the mesh. To change files, we activate this key and input thenew file name.<DT>Key 31:<DD> by activating this key, we can make enquiries about the mesh and obtain information regarding its contents.<DT>Key 30:<DD> the plot will be full screen, or else we need to specify its size in cm.<DT>Key 40:<DD> the type of characters plotted: hardware (by default), software if not.<DT>Key 50:<DD> the choice of items to plot: the triangulation (by default). By activating this key, we have a choice between:<PRE> -- INITIAL MESH : NOTHING : 0 TRIANGULATION : 1 GEOMETRIC BOUNDARY : 2 REFERENCED BOUNDARY : 3 SHRINK : 4 ?</PRE><P>The shrink operation consists of contracting, for a given ratio (0.8 by default, valuemodified via key 23), each element with respect to its barycentre.<DT>Key 60:<DD> the general legend (there is a legend by default) corresponds to theindications appearing to the right of the plot (see examples: title, date, file name, ...). By typing60, we specify that we do not want the general legend.<DT>Key 70:<DD> the numbers to be displayed, none (by default) or, by activating this key, thechoice between:<P><PRE> NO NUMBER : 0 ELEMENT : 1 - POINT : 2 - NODE : 3 SUB-DOMAIN : 4 REFERENCE (ALL) : 5 REFERENCE POINTS : 6 - NODES : 7⌨️ 快捷键说明
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