INTRODUCTORY FLUID MECHANICS KATZ KEY
CONCEPTS AND PRACTICE QUESTIONS
◉ Statics.
Answer: 'Nothing is moving.' You're checking balance/equilibrium.
◉ Dynamics.
Answer: 'Things are moving AND forces matter.' Motion with causes.
◉ Kinematics.
Answer: 'Motion without caring why.' You describe motion but
ignore forces.
◉ Fluid statics.
Answer: Fluids at rest: pressure in tanks, dams, underwater, etc.
◉ Fluid dynamics.
Answer: Fluids moving: flow in pipes, around cars, through nozzles.
◉ Hydrodynamics.
Answer: Fluid motion when density is basically constant (usually
liquids; also slow-speed gases).
, ◉ Hydraulics.
Answer: Hydrodynamics but focused on liquid flow in pipes and
open channels (water systems stuff).
◉ Gas dynamics.
Answer: Gas flow where density changes a lot (high-speed nozzles,
rockets).
◉ Aerodynamics.
Answer: Gas (air) flowing over bodies (cars, planes). Drag/lift type
thinking.
◉ Boundary layer.
Answer: The 'thin slow zone' right next to a wall where viscosity
really matters.
◉ No-slip condition.
Answer: At a solid wall, the fluid touching it has the same speed as
the wall (if wall is still, fluid speed right at it is 0).
◉ Viscosity.
CONCEPTS AND PRACTICE QUESTIONS
◉ Statics.
Answer: 'Nothing is moving.' You're checking balance/equilibrium.
◉ Dynamics.
Answer: 'Things are moving AND forces matter.' Motion with causes.
◉ Kinematics.
Answer: 'Motion without caring why.' You describe motion but
ignore forces.
◉ Fluid statics.
Answer: Fluids at rest: pressure in tanks, dams, underwater, etc.
◉ Fluid dynamics.
Answer: Fluids moving: flow in pipes, around cars, through nozzles.
◉ Hydrodynamics.
Answer: Fluid motion when density is basically constant (usually
liquids; also slow-speed gases).
, ◉ Hydraulics.
Answer: Hydrodynamics but focused on liquid flow in pipes and
open channels (water systems stuff).
◉ Gas dynamics.
Answer: Gas flow where density changes a lot (high-speed nozzles,
rockets).
◉ Aerodynamics.
Answer: Gas (air) flowing over bodies (cars, planes). Drag/lift type
thinking.
◉ Boundary layer.
Answer: The 'thin slow zone' right next to a wall where viscosity
really matters.
◉ No-slip condition.
Answer: At a solid wall, the fluid touching it has the same speed as
the wall (if wall is still, fluid speed right at it is 0).
◉ Viscosity.
