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6  <title>PALM chapter 3.0</title>
7  <meta name="GENERATOR" content="StarOffice 7  (Win32)">
8  <meta name="AUTHOR" content="Marcus Oliver Letzel">
9  <meta name="CREATED" content="20040723;15213734">
10  <meta name="CHANGED" content="20041112;13170538">
11  <meta name="KEYWORDS" content="parallel LES model">
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19<h2 style="font-style: normal; line-height: 100%;"><font size="4">3.0
20Execution of model runs</font></h2>
21<p style="line-height: 100%;">Given that the model was
22installed by the user (look at <a href="chapter_5.0.html">chapter
235.0</a>) and that it is clear, which phenomenon is to be simulated,
24there is a whole set of questions which must be answered before
25executing
26the actual application run, e.g.: </p>
27<ul>
28  <li>
29    <p
30 style="margin-bottom: 0cm; font-style: normal; line-height: 100%;">How
31large does the model domain have to be and what grid size does
32phenomenon to be simulated require? </p>
33  </li>
34  <li>
35    <p
36 style="margin-bottom: 0cm; font-style: normal; line-height: 100%;">How
37long is the time which should be simulated, i.e. which typical time
38scale does the phenomenon have? </p>
39  </li>
40  <li>
41    <p
42 style="margin-bottom: 0cm; font-style: normal; line-height: 100%;">Which
43boundary conditions and initial conditions are to be selected? </p>
44  </li>
45  <li>
46    <p style="font-style: normal; line-height: 100%;">Which model
47output data are necessary at which points in time, in order to be able
48to analyze the phenomenon afterwards? </p>
49  </li>
50</ul>
51<p style="line-height: 100%;">The answers to these questions
52substantially determine the choice of values for the most important
53model parameters, with which the model run is steered. All possible
54parameters are described in chapters <a href="chapter_4.1.html">4.1</a>,
55<a href="chapter_4.2.html">4.2</a>
56and <a href="chapter_4.3.html">4.3</a>.
57The basic steering of the model with these parameters is explained in
58the introduction to <a href="chapter_4.0.html">chapter
594</a>. The user will rarely use all model parameters, since many are
60preset with consistent default values and therefore do not have to be
61changed by the user. Some of the most important parameters are not
62preset with default values and must be adjusted by the user in each
63case. Such a typical, minimum parameter set is described in <a
64 href="chapter_4.4.html">chapter
654.4</a>. For the subsequent analysis of model runs, graphical
66visualization of model data is particularly important. <a
67 href="chapter_4.5.html">Chapter
684.5</a> describes, how such outputs are produced with the model. </p>
69<p style="line-height: 100%;">The selected parameters and their values
70have to be supplied to the model as an input file. The
71structure of this file is described in the introduction to <a
72 href="chapter_4.0.html">chapter
734</a>. The data, produced by the model, are located in a number of
74different output files. The model works with relative file names
75(i.e. without absolute path information). Thus all input and output
76files are
77expected and put in the directory, in which the actual model (the
78executable program created from the FORTRAN source code) is started
79(but also see next paragraph).
80All user-relevant input and output files are described in <a
81 href="chapter_3.4.html">chapter
823.4</a>. </p>
83<p style="line-height: 100%;">The actual model (the executable
84program) is not started directly via the user, but with the help of
85the shell script <a
86 href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun</a>,which
87can be called by the user. This script takes over the entire pre- and
88postprocessing work, which is necessary for a model run. In addition
89to this, it generates e.g. automatically batch jobs for model runs on
90remote computers, provides for the appropriate file transfers of the
91input and output files to these computers, secures data on existing
92archives systems, starts if necessary restart jobs, and much more.
93<span style="font-weight: bold;">mrun</span> allows to specify
94individual path names for each simulation and
95for the different types of input/output files. The start of model runs
96with <b>mrun</b> is described in <a href="chapter_3.1.html">chapter
973.1</a>. </p>
98<p style="line-height: 100%;">The implementation of user code
99extensions in
100the model is made possible by a set of defined interfaces. You will
101find references to the programming of such extensions in <a
102 href="chapter_3.5.html">chapter
1033.5</a>. Frequently errors arise during the execution of the model
104after such changes, which can often be found only by interactive
105model steering and error tracing (debugging), which are described in
106<a href="chapter_3.6.html">chapter
1073.6</a>. </p>
108<hr>
109<p style="font-style: normal; line-height: 100%;"><br>
110<font color="#000080"><font color="#000080"><a href="chapter_2.0.html"><font
111 color="#000080"><img src="left.gif" name="Grafik1" align="bottom"
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118</p>
119<p style="font-style: normal; line-height: 100%;"><span
120 style="font-style: italic;">Last change:</span> 14/04/05 (SR)<br>
121</p>
122</body>
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