# Contents of /trunk/doc/examples/cookbook/example10b.py

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Fri Nov 12 01:19:02 2010 UTC (8 years, 10 months ago) by caltinay
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```Replaced usage of esys.escript.util.saveVTK by weipa.saveVTK in all python
scripts.

```
 1 2 ######################################################## 3 # 4 # Copyright (c) 2009 by University of Queensland 5 # Earth Systems Science Computational Center (ESSCC) 6 7 # 8 # Primary Business: Queensland, Australia 9 # Licensed under the Open Software License version 3.0 10 11 # 12 ######################################################## 13 14 __copyright__="""Copyright (c) 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 20 __url__= 21 22 """ 23 Author: Antony Hallam antony.hallam@uqconnect.edu.au 24 """ 25 26 ############################################################FILE HEADER 27 # example10a.py 28 # Model of gravitational Potential for a Gravity Well. 29 30 #######################################################EXTERNAL MODULES 31 # To solve the problem it is necessary to import the modules we require. 32 from esys.escript import * # This imports everything from the escript library 33 from esys.escript.unitsSI import * 34 from esys.escript.linearPDEs import LinearPDE # This defines LinearPDE as LinearPDE 35 from esys.finley import Brick # This imports the rectangle domain function from finley 36 from esys.weipa import saveVTK # This imports the VTK file saver from weipa 37 import os, sys #This package is necessary to handle saving our data. 38 39 ########################################################MPI WORLD CHECK 40 if getMPISizeWorld() > 1: 41 import sys 42 print "This example will not run in an MPI world." 43 sys.exit(0) 44 45 #################################################ESTABLISHING VARIABLES 46 #Domain related. 47 mx = 500*m #meters - model length 48 my = 500*m #meters - model width 49 mz = -500*m 50 ndx = 50 # mesh steps in x direction 51 ndy = 50 # mesh steps in y direction - one dimension means one element 52 ndz = 50 53 #PDE related 54 rho=1000.0 55 rholoc=[0,0,-0] 56 G=6.67300*10E-11 57 58 ################################################ESTABLISHING PARAMETERS 59 #the folder to put our outputs in, leave blank "" for script path 60 save_path= os.path.join("data","example10") 61 #ensure the dir exists 62 mkDir(save_path) 63 64 ####################################################DOMAIN CONSTRUCTION 65 domain = Brick(l0=mx,l1=my,n0=ndx, n1=ndy,l2=mz,n2=ndz) 66 x=Solution(domain).getX() 67 x=x-[mx/2,my/2,mz/2] 68 domain.setX(x) 69 mask=wherePositive(100-length(x-rholoc)) 70 rho=rho*mask 71 kro=kronecker(domain) 72 73 q=whereZero(x[2]-inf(x[2])) 74 ###############################################ESCRIPT PDE CONSTRUCTION 75 76 mypde=LinearPDE(domain) 77 mypde.setValue(A=kro,Y=4.*3.1415*G*rho,q=q,r=0) 78 mypde.setSymmetryOn() 79 sol=mypde.getSolution() 80 saveVTK(os.path.join(save_path,"ex10b.vtu"),\ 81 grav_pot=sol,\ 82 g_field=-grad(sol),\ 83 g_fieldz=-grad(sol)*[0,0,1],\ 84 gz=length(-grad(sol)*[0,0,1])) 85