PHED-2116EL Lecture Notes - Lecture 18: Airfoil, Leading Edge, Relative Velocity
25 Jun 2018
School
Department
Course
Professor
PHED 2116 - Biomechanics 1
PHED 2116
Biomechanics
Lecture 18
Fluid Mechanics
find more resources at oneclass.com
find more resources at oneclass.com
PHED 2116 - Biomechanics 2
Introduction
•Principles of aerodynamics and hydrodynamics
are important in sports that occur in “fluid
mediums”
find more resources at oneclass.com
find more resources at oneclass.com
PHED 2116 - Biomechanics 3
Introduction: General Definitions
•Relative Velocity
§Velocity of the fluid medium relative to the
velocity of the “body”
§directly affects the magnitude of the forces exerted by
the fluid on the body
§determined by “vector sum” of the velocity of the fluid
and the velocity of the body
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Introduction: principles of aerodynamics and hydrodynamics are important in sports that occur in fluid mediums . Velocity of the fluid medium relative to the velocity of the body . Directly affects the magnitude of the forces exerted by the fluid on the body. Determined by vector sum of the velocity of the fluid and the velocity of the body. Drag force (surface drag & form drag) Body moving slow relative to the fluid. Smooth flow fluid molecules move parallel http://www. youtube. com/watch?v=jiwa4uzoynk&feature=related: turbulent flow. Body moving fast relative to the fluid. Calculating overall drag force: fluid drag force. Slows the motion of a body through a fluid resistance. Cd - found experimentally in wind tunnel (tells how streamlined a body is) A - frontal area facing the flow. V2 - flow velocity ie. speed of movement. Aka skin friction or viscous drag ie. cotton crew sock = 12. 4% increase in drag. (kyle and.
