17 - Expression for Chamber

The following is an example of an expression for remeshing the chamber of a cylinder of initial length of 0.15 meters driven by a piston connected to a drive wheel.

# general parameters

#=============

pi = 4*atan(1)

# === operation parameters ===

rpm = 180

freq = rpm/60

omega = rpm/60*2*pi

theta = omega*time

stroke = 0.1

#Minimum Length of Cylinder Chamber

# (Must correspond to geometry in CAD)

Cyl_Length = 0.15

#=== Drive Wheel Parameters ====

#Radius (R) of drive wheel

R = stroke/2

#Length (Rod) of Connecting Rod

Rod = 0.3

#=== Calculation ===

b = R*cos(theta)

h = R*sin(theta)

S = sqrt(Rod*Rod-h*h)

Delta = Rod+R-(S+b)

z = z+(Delta-y*h/S)*z/Cyl_Length

</expressions>

<#End the Reference>