Commit 5f87cc6a authored by Cristian Lalescu's avatar Cristian Lalescu
Browse files

add slight improvement to tutorial

parent d7ec1ffc
......@@ -13,6 +13,17 @@
.. autoclass:: Launcher.Launcher
......@@ -107,6 +107,8 @@ this is just a :math:`32^3` simulation run for 8 iterations.
First thing you can do afterwards is open up a python console, and type
the following:
.. _sec-first-postprocessing:
.. code:: python
import numpy as np
......@@ -123,9 +125,10 @@ the following:
print ('Tint = {0:.4e}, tauK = {1:.4e}'.format(c.statistics['Tint'],
data_file = c.get_data_file()
print ('total time simulated is = {0:.4e} Tint, {1:.4e} tauK'.format(
c.data_file['iteration'].value*c.parameters['dt'] / c.statistics['Tint'],
c.data_file['iteration'].value*c.parameters['dt'] / c.statistics['tauK']))
data_file['iteration'].value*c.parameters['dt'] / c.statistics['Tint'],
data_file['iteration'].value*c.parameters['dt'] / c.statistics['tauK']))
:func:`compute_statistics <NavierStokes.NavierStokes.compute_statistics>`
will read the data
......@@ -143,7 +146,30 @@ it also saves some data into a ``<simname>_postprocess.h5`` file, and
then it also performs some time averages, yielding the ``statistics``
dictionary that is used in the above code.
What happened
Behind the scenes
What happens, in brief, is the following:
1. An instance ``l`` of :class:`Launcher <Launcher.Launcher>` is created.
One of its members is an :class:`argparse.ArgumentParser`, and
it processes command line arguments given to the ``bfps`` script.
2. ``l`` generates a
:class:`NavierStokes <NavierStokes.NavierStokes>` object ``c``, with
reasonable DNS parameters constructed from the command line
4. ``c`` generates a parameter file ``<simname>.h5``, into which the
various parameters are written.
``c`` also generates the various datasets that the backend code
will write into (statistics and other stuff).
3. ``c`` writes a C++ file that is compiled and linked against
4. ``c`` executes the C++ code using ``mpirun``.
5. the C++ code actually performs the DNS, and outputs various
results into the ``<simname>.h5`` file.
After the simulation is done, things in :ref:`sec-first-postprocessing`
are simpler.
In fact, any ``HDF5`` capable software can be used to read the data
file, and the dataset names should be reasonably easy to interpret.
Behind the scenes, something more complicated took place.
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