--- trunk/doc/examples/usersguide/darcy.py 2014/12/02 05:36:36 5287 +++ trunk/doc/examples/usersguide/darcy.py 2014/12/02 23:18:40 5288 @@ -23,28 +23,36 @@ from esys.escript import * from esys.escript.models import DarcyFlow -from esys.finley import Rectangle +try: + from esys.finley import Rectangle + HAVE_FINLEY = True +except ImportError: + HAVE_FINLEY = False from esys.weipa import saveVTK -# generate domain: -mydomain = Rectangle(l0=2.,l1=1.,n0=40, n1=20) -# normal flux is given -x = mydomain.getX() - -# set location of fixed pressure and flux: -p_BC=whereZero(x[1]-1.)*wherePositive(x[0]-1.) -u_BC=(whereZero(x[0])+whereZero(x[0]-2.)) * [1.,0.] + \ - (whereZero(x[1]) + whereZero(x[1]-1.)*whereNonPositive(x[0]-1.0)) * [0., 1.] - -# define darcy flow solver: -mypde = DarcyFlow(domain=mydomain) - -mypde.setValue(g=[0., 2], - location_of_fixed_pressure=p_BC, - location_of_fixed_flux=u_BC, - permeability=100.) -u,p=mypde.solve(u0=x[1]*[0., -1.], p0=0) +if not HAVE_FINLEY: + print("Finley module not available") +else: + # generate domain: + mydomain = Rectangle(l0=2.,l1=1.,n0=40, n1=20) + # normal flux is given + x = mydomain.getX() + + # set location of fixed pressure and flux: + p_BC=whereZero(x[1]-1.)*wherePositive(x[0]-1.) + u_BC=(whereZero(x[0])+whereZero(x[0]-2.)) * [1.,0.] + \ + (whereZero(x[1]) + whereZero(x[1]-1.)*whereNonPositive(x[0]-1.0)) * [0., 1.] + + # define darcy flow solver: + mypde = DarcyFlow(domain=mydomain) + + mypde.setValue(g=[0., 2], + location_of_fixed_pressure=p_BC, + location_of_fixed_flux=u_BC, + permeability=100.) -# write u to an external file -saveVTK("u.vtu",flux=u, pressure=p) + u,p=mypde.solve(u0=x[1]*[0., -1.], p0=0) + + # write u to an external file + saveVTK("u.vtu",flux=u, pressure=p)