/[escript]/trunk/doc/cookbook/onedheatdiff002.py
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Contents of /trunk/doc/cookbook/onedheatdiff002.py

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Revision 2401 - (show annotations)
Wed Apr 29 04:23:07 2009 UTC (11 years, 7 months ago) by ahallam
File MIME type: text/x-python
File size: 3024 byte(s)
End Week 5:
Renamed *.tex files to more logical, changed to chapter format as HEAT_DIFFUSION.tex
Editted and Reviewed text portion and some python scripts for heat diffusion.
Looking to push for finalisation on heat diffusion in the next couple of week to begin next modelling problem/Chapter.
1
2 ########################################################
3 #
4 # Copyright (c) 2003-2009 by University of Queensland
5 # Earth Systems Science Computational Center (ESSCC)
6 # http://www.uq.edu.au/esscc
7 #
8 # Primary Business: Queensland, Australia
9 # Licensed under the Open Software License version 3.0
10 # http://www.opensource.org/licenses/osl-3.0.php
11 #
12 ########################################################
13
14 __copyright__="""Copyright (c) 2003-2009 by University of Queensland
15 Earth Systems Science Computational Center (ESSCC)
16 http://www.uq.edu.au/esscc
17 Primary Business: Queensland, Australia"""
18 __license__="""Licensed under the Open Software License version 3.0
19 http://www.opensource.org/licenses/osl-3.0.php"""
20 __url__="https://launchpad.net/escript-finley"
21
22 """
23 Author: Antony Hallam antony.hallam@uqconnect.edu.au
24 """
25
26 # To solve the problem it is necessary to import the modules we require.
27 from esys.escript import * # This imports everything from the escript library
28 from esys.escript.linearPDEs import LinearPDE # This defines LinearPDE as LinearPDE
29 from esys.finley import Rectangle # This imports the rectangle domain function from finley
30 import os #This package is necessary to handle saving our data.
31
32
33
34 ##ESTABLISHING VARIABLES
35 #PDE related
36 mx = 500 # model lenght
37 my = 100 # model width
38 ndx = 500 # steps in x direction
39 ndy = 1 # steps in y direction
40
41 q=0 #our heat source temperature is now zero
42 Tref=2273 # Kelvin #the starting temperature of our intrusion
43 rho = 2750 #kg/m^{3} density
44 cp = 790 #j/kg specific heat
45 rhocp = rho*cp #DENSITY * SPECIFIC HEAT
46 eta=0. # RADIATION CONDITION
47 kappa=2.2 # Watts/(meter*Kelvin) DIFFUSION CONSTANT, HEAT PERMEABILITY
48 #Script/Iteration Related
49 t=0. #our start time, usually zero
50 tday=10*365. #the time we want to end the simulation in days
51 tend=tday*24*60*60
52 outputs = 400 # number of time steps required.
53 h=(tend-t)/outputs #size of time step
54
55 print "Expected Number of Output Files is: ", outputs
56 print "Step size is: ", h/(24.*60*60), "days"
57
58
59 i=0 #loop counter
60 save_path = "data/onedheatdiff_var001" #the folder to put our outputs in, leave blank "" for script path - note this folder path must exist to work
61
62 #... generate domain ...
63 model = Rectangle(l0=mx,l1=my,n0=ndx, n1=ndy)
64 # extract finite points
65 x=model.getX()
66 #... open PDE ...
67 mypde=LinearPDE(model)
68 mypde.setSymmetryOn()
69 mypde.setValue(A=kappa*kronecker(model),D=rhocp/h,d=eta,y=eta*Tref)
70
71 # ... set initial temperature ....
72 bound = x[0]-mx/(ndx/250.)
73 T= 0*Tref*whereNegative(bound)+Tref*wherePositive(bound)
74
75 saveVTK(os.path.join(save_path,"data%03d.xml") %i,sol=T)
76
77 # ... start iteration:
78 while t<=tend:
79 i+=1
80 t+=h
81 mypde.setValue(Y=rhocp/h*T)
82 T=mypde.getSolution()
83 saveVTK(os.path.join(save_path,"data%03d.xml") %i,sol=T)
84
85 # iteration var 2
86 #Tl = 0
87 #Tr = Tref
88 #while Tl < Tr*0.8:
89 #mypde.setValue(Y=rhocp/h*T)
90 #T=mypde.getSolution()
91 #i+=1
92 #x=rod.getX()
93 #Tl= x[0]
94 #Tr= x[
95
96 #print "Finish temp balance in:", i*h/(24.*60*60), " days"

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