Aerodynamics of Cycling. Stephen Kulju. http://www.mira.co.uk/Services/images/bike.jpg. Outline. Introduction Basic Fluid Mechanics Drag and Friction Bicycle Aerodynamics Position Velocity & Power Output Reducing Drag Drafting Crosswind effects. Introduction.
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Velocity of fluid is zero along surface due to friction . (No slip condition)
Figure from Fundamentals of Fluid Mechanics pg. 97
Figure from Fundamentals of Fluid Mechanics pg. 108
(a) Normal pressure and friction forces (b) Attached and separated flow around a cylinder (c) Attached flow and pressure recovery along a streamlined body
Figure from Bicycle Science pg. 174
Drag coefficients of various geometries
Figure from Bicycling Science pg. 191
Figure from Bicycling Science pg. 188
Image and caption from Road Cycling Handbook
Image from Bicycling Science pg. 191
Negative drag propels object forward at close distances(~ 1 diameter and under)
Image from Bicycling Science pg. 199
to side by side
Higher CD occurs at distances less than the of the width of the strut
Aerodynamic interference of two side by side struts.
Image from Bicycling Science pg. 201