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Equations Combined

We can now write the equations of a three-dimensional, Newtonian, ideal,
compressible, electro-neutral gas dynamics in zero gravity as:

where all state variables are computed per volume, and the
internal energy per mole specific volume. The in going terms are defined as
follows:

where we use and define the kinematic viscosity properly in a later section.

Peter Søndergaard & Jan Vittrup Hansen