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

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```fixing tests for cases where required domains not built
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 1 from __future__ import division 2 from __future__ import print_function 3 ############################################################################## 4 # 5 # Copyright (c) 2009-2014 by University of Queensland 6 7 # 8 # Primary Business: Queensland, Australia 9 # Licensed under the Open Software License version 3.0 10 11 # 12 # Development until 2012 by Earth Systems Science Computational Center (ESSCC) 13 # Development 2012-2013 by School of Earth Sciences 14 # Development from 2014 by Centre for Geoscience Computing (GeoComp) 15 # 16 ############################################################################## 17 18 __copyright__="""Copyright (c) 2009-2014 by University of Queensland 19 http://www.uq.edu.au 20 Primary Business: Queensland, Australia""" 21 __license__="""Licensed under the Open Software License version 3.0 22 23 __url__= 24 25 """ 26 Author: Antony Hallam antony.hallam@uqconnect.edu.au 27 """ 28 29 ############################################################FILE HEADER 30 # example10a.py 31 # Model of gravitational Potential for a Gravity Well. 32 33 #######################################################EXTERNAL MODULES 34 # To solve the problem it is necessary to import the modules we require. 35 from esys.escript import * # This imports everything from the escript library 36 from esys.escript.unitsSI import * 37 from esys.escript.linearPDEs import LinearPDE # This defines LinearPDE as LinearPDE 38 from esys.weipa import saveVTK # This imports the VTK file saver from weipa 39 import os, sys #This package is necessary to handle saving our data. 40 41 from esys.escript.pdetools import Projector, Locator 42 import numpy as np 43 44 try: 45 # This imports the rectangle domain function 46 from esys.finley import Brick 47 HAVE_FINLEY = True 48 except ImportError: 49 print("Finley module not available") 50 HAVE_FINLEY = False 51 ########################################################MPI WORLD CHECK 52 if getMPISizeWorld() > 1: 53 import sys 54 print("This example will not run in an MPI world.") 55 sys.exit(0) 56 57 if HAVE_FINLEY: 58 #################################################ESTABLISHING VARIABLES 59 #Domain related. 60 mx = 500*m #meters - model length 61 my = 500*m #meters - model width 62 mz = -4000*m 63 ndx = 15 # mesh steps in x direction 64 ndy = 15 # mesh steps in y direction - one dimension means one element 65 ndz = 10 66 #PDE related 67 rho=100.0 68 rholoc=[0,0,-0] 69 G=6.67300*10E-11 70 71 ################################################ESTABLISHING PARAMETERS 72 #the folder to put our outputs in, leave blank "" for script path 73 save_path= os.path.join("data","example10") 74 #ensure the dir exists 75 mkDir(save_path) 76 77 ####################################################DOMAIN CONSTRUCTION 78 domain = Brick(l0=mx,l1=my,n0=ndx, n1=ndy,l2=mz,n2=ndz) 79 x=Solution(domain).getX() 80 x=x-[mx/2,my/2,mz/2] 81 domain.setX(interpolate(x, ContinuousFunction(domain))) 82 mask=wherePositive(100-length(x-rholoc)) 83 rho=rho*mask 84 kro=kronecker(domain) 85 86 mass=rho*vol(domain) 87 ipot=FunctionOnBoundary(domain) 88 xb=ipot.getX() 89 90 q=whereZero(x[2]-inf(x[2])) 91 ###############################################ESCRIPT PDE CONSTRUCTION 92 93 mypde=LinearPDE(domain) 94 mypde.setValue(A=kro,Y=4.*3.1415*G*rho,q=q,r=0) 95 mypde.setSymmetryOn() 96 sol=mypde.getSolution() 97 saveVTK(os.path.join(save_path,"ex10b.vtu"),\ 98 grav_pot=sol,\ 99 g_field=-grad(sol),\ 100 g_fieldz=-grad(sol)*[0,0,1],\ 101 gz=length(-grad(sol)*[0,0,1])) 102 103 ################################################MODEL SIZE SAMPLING 104 sampler=[] 105 for i in range(-250,250,1): 106 sampler.append([i,0,250]) 107 108 sample=[] # array to hold values 109 rec=Locator(domain,sampler) #location to record 110 psol=rec.getValue(sol) 111 np.savetxt(os.path.join(save_path,"example10b_%04d.asc"%mx),psol) 112

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