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88 lines
3.6 KiB
TeX
88 lines
3.6 KiB
TeX
\section[Quick start guide]{Compiling and running a sample application}
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\label{quick-start-guide}
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The previous section showed how to install and compile \eWoms. This
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chapter gives you a very brief introduction how to run a first test
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application and how to visualize the output files it produces. Only the
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rough steps will be described here; More detailed explanations can be
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found in the tutorials in the following chapter.
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\begin{enumerate}
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\item Go to the directory \texttt{/test}. There, various test
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application folders can be found. Let us consider as example
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\texttt{boxmodels/lens{\_}immiscible}:
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\item Enter the folder \texttt{boxmodels/}.
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\item By default, the \texttt{dunecontrol} command only compiles the
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parts of \Dune modules that are necessary to build modules depending
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on the given module. For \eWoms, \texttt{dunecontrol} does not build
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anything by default, because \eWoms only provides \Cplusplus
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template classes but no libraries that need compilation. To compile
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the test simulation for the "lens" problem which uses the immiscible
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box model, enter
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\begin{lstlisting}[style=Bash]
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make lens_immiscible
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\end{lstlisting}
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You may also compile all available tests which use the box scheme by entering
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\begin{lstlisting}[style=Bash]
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make check
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\end{lstlisting}
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This takes quite some time, but if you have a multi-core processor
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with \$N cores, you can considerably speed up compilation by using all
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of available cores by using
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\begin{lstlisting}[style=Bash]
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make -j $N check
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\end{lstlisting}
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%$
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\item If everything was compiled correctly, there should be an
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executable \texttt{lens{\_}immiscible}. To run the simulation,
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simply run it, i.e. enter
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\begin{lstlisting}[style=Bash]
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./lens_immiscible
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\end{lstlisting}
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You may also want to change some parameters from the command line. For
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example, if you want to change the time up to which the simulation is
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run to $30.000$ seconds, use
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\begin{lstlisting}[style=Bash]
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./lens_immiscible --end-time=30e3
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\end{lstlisting}
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You can also get a list of parameters recognized by the
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simulation together with a brief description, by running
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\begin{lstlisting}[style=Bash]
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./lens_immiscible --help
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\end{lstlisting}
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\item After this, the simulation should start and produce some output
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on the terminal. It is possible to interrupt it at any time by
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pressing \texttt{<Ctrl>+<C>}.
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\item The actual output files produced by the simulation are a series
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of \texttt{.vtu} files and a \texttt{.pvd} file. The \texttt{.vtu}
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contain "visualization ready" data which is produced during the
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simulation, while the \texttt{.pvd} file "stitches" these together
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into a coherent data set. For example, the \texttt{.pvd} holds the
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simulation time at which a given data-set is produced which can
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later be used for visualization.
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\item You can now display the result of the simulation using the
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visualization tool ParaView (or, if you prefer, VisIt). Just type
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\texttt{paraview} in the console and open the \texttt{.pvd} file. On
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the left hand side, you should now be able to click the green
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``Apply'' button. Once you have done this, the visualization of the
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simulation result appears on the screen and you can click the
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``play'' button in the toolbar to view display its evolution over
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time. Also note that you can choose the output quantity to be
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displayed in the toolbar. For the lens problem, the most insight can
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be gained by looking at one of the saturations.
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\item Play a bit around to make your self familiar with the
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visualization tool of your choice as you will be using it a lot.
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\end{enumerate}
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "ewoms-handbook"
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%%% End:
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