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- A control volume is a general region.
- Examples: a jet engine, balloon, the vicinity of a car or a plane, ...
- At different times, a control volume will usually not contain
the same fluid.
- While a Lagrangian description follows the fluid, an Eulerian
decription keeps the spatial location constant.
Warning:
The laws of physics and thermodynamics do not apply directly to
control volumes.
Corrections are needed:
- integrals over the surface (regions)
- Lagrangian time derivatives (points)

Exercise:
Give some simple examples of control volumes where the basic
laws of physics or thermodynamics are not satisfied.

Next: Density
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Previous: Lagrangian Description
01/05/00 0:23:24