/[escript]/trunk/doc/examples/cookbook/example01a.py
ViewVC logotype

Annotation of /trunk/doc/examples/cookbook/example01a.py

Parent Directory Parent Directory | Revision Log Revision Log


Revision 5288 - (hide annotations)
Tue Dec 2 23:18:40 2014 UTC (4 years, 10 months ago) by sshaw
File MIME type: text/x-python
File size: 3857 byte(s)
fixing tests for cases where required domains not built
1 sshaw 5288 from __future__ import division, print_function
2 jfenwick 3981 ##############################################################################
3 ahallam 2392 #
4 jfenwick 4657 # Copyright (c) 2009-2014 by University of Queensland
5 jfenwick 3981 # http://www.uq.edu.au
6 ahallam 2392 #
7     # Primary Business: Queensland, Australia
8     # Licensed under the Open Software License version 3.0
9     # http://www.opensource.org/licenses/osl-3.0.php
10     #
11 jfenwick 3981 # Development until 2012 by Earth Systems Science Computational Center (ESSCC)
12 jfenwick 4657 # Development 2012-2013 by School of Earth Sciences
13     # Development from 2014 by Centre for Geoscience Computing (GeoComp)
14 jfenwick 3981 #
15     ##############################################################################
16 ahallam 2392
17 jfenwick 4657 __copyright__="""Copyright (c) 2009-2014 by University of Queensland
18 jfenwick 3981 http://www.uq.edu.au
19 ahallam 2392 Primary Business: Queensland, Australia"""
20     __license__="""Licensed under the Open Software License version 3.0
21     http://www.opensource.org/licenses/osl-3.0.php"""
22     __url__="https://launchpad.net/escript-finley"
23    
24     """
25     Author: Antony Hallam antony.hallam@uqconnect.edu.au
26     """
27 ahallam 2977 ############################################################FILE HEADER
28     # example01a.py
29     # Model temperature diffusion between two granite blocks of unequal
30     # initial temperature. Solve for total energy in the system.
31 sshaw 5288 import sys
32 ahallam 2977 #######################################################EXTERNAL MODULES
33 ahallam 2392 # To solve the problem it is necessary to import the modules we require.
34     from esys.escript import * # This imports everything from the escript library
35 gross 2904 from esys.escript.unitsSI import *
36 ahallam 2392 from esys.escript.linearPDEs import LinearPDE # This defines LinearPDE as LinearPDE
37 sshaw 5288 try:
38     from esys.finley import Rectangle
39     HAVE_FINLEY = True
40     except ImportError:
41     print("Finley module not available")
42     HAVE_FINLEY = False
43    
44     if HAVE_FINLEY:
45     #################################################ESTABLISHING VARIABLES
46     #Domain related.
47     mx = 500*m #meters - model length
48     my = 100*m #meters - model width
49     ndx = 100 # mesh steps in x direction
50     ndy = 1 # mesh steps in y direction - one dimension means one element
51     boundloc = mx/2 # location of boundary between the two blocks
52     #PDE related
53     rho = 2750. *kg/m**3 #kg/m{3} density of iron
54     cp = 790.*J/(kg*K) # J/Kg.K thermal capacity
55     rhocp = rho*cp
56     kappa = 2.2*W/m/K # watts/m.Kthermal conductivity
57     qH=0 * J/(sec*m**3) # J/(sec.m{3}) no heat source
58     T1=20 * Celsius # initial temperature at Block 1
59     T2=2273. * Celsius # base temperature at Block 2
60 ahallam 2392
61    
62 sshaw 5288 ################################################ESTABLISHING PARAMETERS
63     t=0 * day # our start time, usually zero
64     tend=50 * yr # - time to end simulation
65     outputs = 200 # number of time steps required.
66     h=(tend-t)/outputs #size of time step
67     #user warning statement
68     print("Expected Number of time outputs is: ", (tend-t)/h)
69     i=0 #loop counter
70     #the folder to put our outputs in, leave blank "" for script path
71     save_path= os.path.join("data","example01")
72     #ensure the dir exists
73     mkDir(save_path, os.path.join(save_path,"tempT"))
74 ahallam 3374
75 sshaw 5288 ####################################################DOMAIN CONSTRUCTION
76     blocks = Rectangle(l0=mx,l1=my,n0=ndx, n1=ndy)
77 ahallam 2392
78 sshaw 5288 ###############################################ESCRIPT PDE CONSTRUCTION
79     #... open PDE and set coefficients ...
80     mypde=LinearPDE(blocks)
81     mypde.setSymmetryOn()
82     A=zeros((2,2))
83     A[0,0]=kappa
84     mypde.setValue(A=A,D=rhocp/h)
85     # ... set initial temperature ....
86     x=Solution(blocks).getX()
87     T= T1*whereNegative(x[0]-boundloc)+T2*(1-whereNegative(x[0]-boundloc))
88 ahallam 2977
89 sshaw 5288 ########################################################START ITERATION
90     while t<tend:
91     i+=1
92     t+=h
93     mypde.setValue(Y=qH+rhocp/h*T)
94     T=mypde.getSolution()
95     totE=integrate(rhocp*T)
96     print("time step %s at t=%e days completed. total energy = %e."%(i,t/day,totE))

  ViewVC Help
Powered by ViewVC 1.1.26