﻿ Sample Problems > Usage > Misc > two_histories

# two_histories

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# two_histories   { TWO_HISTORIES.PDE

This example illustrates use of multiple arguments in a HISTORY plot.

It also shows the use of the WINDOW plot qualifier on a HISTORY plot.

The problem is the same as FLOAT_ZONE.PDE.

}

title

"Multiple HISTORY functions"

coordinates

xcylinder('Z','R')

select

cubic                         { Use Cubic Basis }

variables

temp (threshold=100)

definitions

k = 0.85                           {thermal conductivity}

cp = 1                             { heat capacity }

long = 18

H = 0.4                             {free convection boundary coupling}

Ta = 25                             {ambient temperature}

A = 4500                           {amplitude}

source = A*exp(-((z-1*t)/.5)^2)*(200/(t+199))

initial value

temp = Ta

equations

temp:  div(k*grad(temp)) + source = cp*dt(temp)

boundaries

region 1

start(0,0)

natural(temp) = 0 line to (long,0)

value(temp) = Ta line to (long,1)

natural(temp) = -H*(temp - Ta) line to (0,1)

value(temp) = Ta line to close

feature

start(0.01*long,0) line to (0.01*long,1)

time -0.5 to 19 by 0.01

monitors

for t = -0.5 by 0.5 to (long + 1)

elevation(temp) from (0,1) to (long,1) range=(0,1800) as "Surface Temp"

contour(temp)

plots

for t = -0.5 by 0.5 to (long + 1)

elevation(temp) from (0,0) to (long,0) range=(0,1800) as "Axis Temp"

histories

history(temp,dt(temp)) at (5,0) (10,0) (15,0)

history(temp,dt(temp)) at (5,0) (10,0) (15,0) window = 5 ! moving window

history(temp,dt(temp)) at (5,0) (10,0) (15,0) window(3,8) ! fixed window

history(integral(temp),integral(dt(temp)))

end