- 1.
- In what aspect are characteristic equations different from other
equations?
The derivatives are all in a single direction.
- 2.
- What are the propagation velocities of the three sets
of characteristics?
- 3.
- Identify the physical meaning of the three sets of characteristics.
Left and right moving sound waves, particle paths.
- 4.
- What are the acoustic assumptions?
The flow velocity is small compared to the speed of sound,
the thermodynamic state is close to a constant one.
- 5.
- In the acoustic approximation,
would be a function of
what variable?
