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Energy balance
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To see the energy balance globally and discretely, :ref:`the momentum balance <discrete_momentum>` for each direction is integrated in the whole volume after multiplied by the corresponding local velocity.

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Temporal evolution and advection
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.. include:: ./advective.rst

*****************
Pressure gradient
*****************

.. include:: ./pressure.rst

*********
Diffusion
*********

.. include:: ./diffusive.rst