WIND FLOW OVER A BICYCLE

AIM:
1.To Plot a graph between Velocity Vs Drag force
2.To Plot a graph between Drag Co-efficient vs Drag force

OBJECTIVE: To monitor the windflow over a bicycyle.

SOFTWARE: MATLAB R2019B

OBSERVATION:
1. What happens when velocity changes (1 - 10 M/S^2) when co-efficient drag is constant (We taken the values of steam lined body 0.04)?
2. What happens when co-efficient drag varies (steam lined body, steamlined half body ,halfshpere , sphere , cone, angle cube, long cyclinder, cube and short cylinder) (Values are [0.04 0.09 0.42 0.47 0.50 0.8 0.82 1.05 1.15]) and Velocity is constant (8 M/S^2)?

CONTENT:
1. Introuction
2. formula and their units
3. Working
4. Learning from this task
5. Conclusion

INTROUDCTION & FORMULA UNITS:

DRAG FORCE: A drag force is the resistance force caused by the motion of a body through a fluid, such as water or air. A drag force acts opposite to the direction of the oncoming flow velocity. This is the relative velocity between the body and the fluid.

Fd = 1/2 CdρAV^2

Where:

C is the drag coefficient, which can vary along with the speed of the body. But typical values range from 0.4 to 1.0 for different fluids (such as air and water)

ρ is the density of the fluid through which the body is moving. Unit: Kg/M^3

v is the speed of the body relative to the air. Unit: M/S

A is the projected cross-sectional area of the body perpendicular to the flow direction (that is, perpendicular to v). Unit: M^2

Relevant Diagram:

WORKING:
NOTE: Initially use the basic code

clear all (Previous Worked data are cleared)
close all (Previous Worked graphs are cleared)
clc (Previous Worked commands used in command window are cleared)

% To find the wind flow over a bicycle 
%(Drag Co-efficient vs Drag force)
clear all
close all
clc

%Inputs

%drag coefficient (steam lined body, steamlined half body ,halfshpere ,
%sphere , cone, angle cube, long cyclinder, cube and short cylinder)

c_d = [0.04 0.09 0.42 0.47 0.50 0.8 0.82 1.05 1.15] 

%Area m^2
A = 0.23

%density Kg/M^3 considering atmospheric temperature 30 deg C
rho = 1.1644

%velocity m/s
V = 8

drag_force = rho*A*V.^2*c_d*0.5

plot(c_d, drag_force,'color','r')
grid on
xlabel('co efficinet drag cd')
ylabel('drag force KgmM/S^2 ')

% Wind flow over a bike bicycle %
% velocity vs drag force

clear all
close all
clc

%Inputs
%draf coefficient values of steam lined body taken
c_d = 0.04

%area M^2

A = 0.23

%density Kg/M^2 considering atmospheric temperature 30 deg C
rho = 1.1644

%velocity M/S
V = [1:10]

%drag force
f_d = rho*A*V.^2*c_d*0.5

plot(V,f_d,'color','r')
grid on
xlabel('velocity V M/S')
ylabel('drag force fd Kgm/S^2')

LEARNING FROM THE TASK:
1. We observed that when velocity increase and drag force increase
2. We observe when drag force increase co efficient increase

Graph:

CONCLUSION:
We learned and observe the drag force observation inputing values and observe by plotting the graph.