| 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
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| 3 | <meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"><title>PALM |
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| 4 | chapter 4.5.7</title> <meta name="GENERATOR" content="StarOffice 7 (Win32)"> <meta name="AUTHOR" content="Siegfried Raasch"> <meta name="CREATED" content="20041029;14344622"> <meta name="CHANGED" content="20050119;9531085"> <meta name="KEYWORDS" content="parallel LES model"> <style> |
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| 9 | |
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| 10 | <body style="direction: ltr;" lang="en-US"><h4 style="line-height: 100%;"><font size="4">4.5.7 |
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| 11 | Plots of |
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| 12 | isosurfaces, 2d cross sections and particles with dvrp</font></h4> |
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| 13 | <p style="line-height: 100%;">The <span style="font-weight: bold;">dvrp</span> |
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| 14 | software developed by the RRZN |
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| 15 | (Stephan Olbrich, Carsten Chmielewski) allows a creation of plot |
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| 16 | sequences with PALM, |
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| 17 | which can be animated via a special plugin for internet browsers. With |
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| 18 | suitable graphic hardware even stereoscopic views are |
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| 19 | possible. <br> |
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| 20 | In contrast to the other kinds of visualization output realized |
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| 21 | in PALM (<b>profil</b>, <b>iso2d</b> and <b>AVS</b>), |
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| 22 | where the data |
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| 23 | is output in a format suitable for the plot software, the creation of |
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| 24 | plots via <span style="font-weight: bold;">dvrp</span> |
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| 25 | software is |
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| 26 | integrated in PALM, i.e. respective routines are directly called within |
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| 27 | the PALM code. The |
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| 28 | <span style="font-weight: bold;">dvrp</span> |
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| 29 | routines then output the |
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| 30 | graphic data |
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| 31 | (so-called plot-primitives, e.g. polygones of isosurfaces) in a special |
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| 32 | dvr format. Since the <span style="font-weight: bold;">dvrp</span> |
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| 33 | software is parallelized (i.e. each PE calculates the graphic data for |
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| 34 | its subdomain), the visualization of simulations with very |
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| 35 | large numbers of grid points is possible (which so far failed because |
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| 36 | of |
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| 37 | several problems: volume of the raw data, which rapidly may sum-up to |
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| 38 | several Terabytes; main memory size needed for graphic workstations, on |
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| 39 | which the visualization is to be carried out; the insufficient scalar |
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| 40 | (!) |
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| 41 | computing speed of commercial graphic software in case of such |
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| 42 | large numbers of grid points). </p> |
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| 43 | <p style="line-height: 100%;">The coupling of <span style="font-weight: bold;">dvrp</span> software and |
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| 44 | PALM |
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| 45 | as well as the visualization of the model results via <span style="font-weight: bold;">dvrp</span> has been |
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| 46 | the main focus of the BMBF project "Application of |
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| 47 | tele-immersion in long-distance networks" (2001-2002), |
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| 48 | which was a joint project of RRZN, ZIB and IMUK. This work is currently |
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| 49 | continued by RRZN in the new DFG-funded project "EVITA - Untersuchung |
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| 50 | effizienter |
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| 51 | <br>Methoden zur visuellen und haptischen tele-immersiven |
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| 52 | Exploration |
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| 53 | <br>komplexer Volumen- und Strömungsdaten aus |
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| 54 | parallelisierten, |
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| 55 | <br>dynamischen 3D-Simulationen" (2005-2007). </p> |
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| 56 | <p style="line-height: 100%;">The calls of the <span style="font-weight: bold;">dvrp</span> routines are |
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| 57 | contained within a |
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| 58 | PALM software package (see chapter <a href="chapter_3.7.html">3.7</a>). |
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| 59 | To use this package, the additional option <tt><font size="2">-p |
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| 60 | “dvrp_graphics”</font></tt> |
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| 61 | has to be given in the <b>mrun</b> call. This |
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| 62 | automatically links the |
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| 63 | required libraries. |
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| 64 | Steering of the plot output is done via the package |
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| 65 | parameters (see chapter <a href="chapter_4.2.html">4.2</a>). |
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| 66 | In contrast to all other PALM output, <span style="font-weight: bold;">dvrp</span> |
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| 67 | graphic |
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| 68 | data are not output to local files but directly to a special remote |
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| 69 | computer which is defined via the package parameter <a href="chapter_4.2.html#dvrp_host">dvrp_host</a>. |
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| 70 | The |
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| 71 | default values of the dvrp parameters are cause the output to be |
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| 72 | directed to a so-called streaming server at the |
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| 73 | RRZN. Apart from graphic data an additional html file is created, which |
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| 74 | can be used by an internet browser to view the data (a special <span style="font-weight: bold;">dvrp</span> plugin is |
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| 75 | needed). </p> |
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| 76 | <p style="line-height: 100%;">Since July 2001, the basic |
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| 77 | functionality |
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| 78 | of the <span style="font-weight: bold;">dvrp</span> |
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| 79 | software is |
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| 80 | installed in PALM and steerable via the |
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| 81 | package parameters. However, some code modifications may still need to |
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| 82 | be done by the user (e.g. in |
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| 83 | the subroutine <tt><font style="font-size: 10pt;" size="2">plot_dvrp</font></tt> |
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| 84 | in order to define suitable color tables). |
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| 85 | <br>For further detailed information please ask Siegfried Raasch. |
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| 86 | </p> |
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| 87 | <hr><p style="line-height: 100%;"><br> |
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| 88 | <font color="#000080"><font color="#000080"><a href="chapter_4.5.6.html"><font color="#000080"><img src="left.gif" name="Grafik1" align="bottom" border="2" height="32" width="32"></font></a><a href="index.html"><font color="#000080"><img src="up.gif" name="Grafik2" align="bottom" border="2" height="32" width="32"></font></a><a href="chapter_4.6.html"><font color="#000080"><img src="right.gif" name="Grafik3" align="bottom" border="2" height="32" width="32"></font></a></font></font></p><p style="line-height: 100%;"> <i>Last |
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| 89 | change: </i> $Id: chapter_4.5.7.html 62 2007-03-13 02:52:40Z letzel $</p> |
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| 90 | </body></html> |
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