2.0. FUNDAMENTALS OF FLOW

Hydrodynamics is easier introduced by the understanding of some basic principles - conservation of mass principle, the energy principle, and the principle of momentum. These principles are used in understanding the phenomena during fluid flow.

Two methods are developed to meet the concerns of fluid flow:

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1. Lagrangian method which analyzes the velocity and acceleration changes of an arbitrary particle.
2. Eulerian method where velocity and pressure changes of a particle are studied at specific points at a certain time.

Fluid behavior also appears in different variations:

• Steady vs unsteady
• Uniform vs non-uniform
• One dimensional vs multi-dimensional
• Viscid vs inviscid
• Compressible vs incompressible
• Ideal vs real

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