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########################################################
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# Copyright (c) 2003-2010 by University of Queensland
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# Earth Systems Science Computational Center (ESSCC)
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# http://www.uq.edu.au/esscc
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# Primary Business: Queensland, Australia
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# Licensed under the Open Software License version 3.0
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# http://www.opensource.org/licenses/osl-3.0.php
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########################################################
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__copyright__="""Copyright (c) 2003-2010 by University of Queensland
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Earth Systems Science Computational Center (ESSCC)
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http://www.uq.edu.au/esscc
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Primary Business: Queensland, Australia"""
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__license__="""Licensed under the Open Software License version 3.0
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http://www.opensource.org/licenses/osl-3.0.php"""
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__url__="https://launchpad.net/escript-finley"
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# upwinding test moving a Gaussian hill around
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# we solve U_,t + v_i u_,i =0
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# the solution is given as u(x,t)=1/(4*pi*E*t)^{dim/2} * exp ( - |x-x_0(t)|^2/(4*E*t) )
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# where x_0(t) = [ cos(OMEGA0*T0)*0.5,-sin(OMEGA0*T0)*0.5 ] and v=[-y,x]*OMEGA0 for dim=2 and
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# x_0(t) = [ cos(OMEGA0*T0)*0.5,-sin(OMEGA0*T0)*0.5 ] and v=[-y,x]*OMEGA0 for dim=3
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# the solution is started from some time T0>0.
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# We are using five quality messurements for u_h
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# - sup(u_h)/sup(u(x,t)) = sup(u_h)*(4*pi*E*t)^{dim/2} ~ 1
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# - integrate(u_h) ~ 1
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# - | x_0h-x_0 | ~ 0 where x_0h = integrate(x*u_h)
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# - sigma_h/4*E*t ~ 1 where sigma_h=sqrt(integrate(length(x-x0h)**2 * u_h) * (DIM==3 ? sqrt(2./3.) :1 )
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from esys.escript import *
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from esys.escript.linearPDEs import LinearSinglePDE, TransportPDE
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from esys.dudley import Rectangle, Brick
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from math import pi, ceil
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TEST_SUPG=False or True
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# saveVTK("u.%s.vtu"%0,u=u0)
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dom.setX(2*dom.getX()-1)
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r=sqrt(x[0]**2+(x[1]-1./3.)**2)
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# u0=whereNegative(r-1./3.)*wherePositive(wherePositive(abs(x[0])-0.05)+wherePositive(x[1]-0.5))
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x=Function(dom).getX()
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V=OMEGA0*(x[0]*[0,-1]+x[1]*[1,0])
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V=OMEGA0*(x[0]*[0,cos(ALPHA),0]+x[1]*[-cos(ALPHA),0,sin(ALPHA)]+x[2]*[0.,-sin(ALPHA),0.])
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fc=TransportPDE(dom,num_equations=1,theta=THETA)
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x=Function(dom).getX()
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fc.setValue(M=Scalar(1.,Function(dom)),C=V)
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supg=LinearSinglePDE(dom)
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supg.setSolverMethod(supg.LUMPING)
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dt_supg=inf(dom.getSize()/length(V))
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# saveVTK("u.%s.vtu"%c,u=u0)
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fc.setInitialSolution(u0)
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print "QUALITY FCT: time = %s pi"%(t/pi),inf(u0),sup(u0),integrate(u0)
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print "time step t=",t+dt
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u=fc.solve(dt, verbose=True)
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print "QUALITY FCT: time = %s pi"%(t+dt/pi),inf(u),sup(u),integrate(u)
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#========== supg tests ================
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nn=max(ceil(dt/dt_supg),1.)
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supg.setValue(Y=u_supg+dt2/2*inner(V,grad(u_supg)))
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u2=supg.getSolution()
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supg.setValue(Y=u_supg+dt2*inner(V,grad(u2)))
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u_supg=supg.getSolution()
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print "QUALITY SUPG: time = %s pi"%(t/pi),inf(u_supg),sup(u_supg),integrate(u_supg)
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# saveVTK("u2.%s.vtu"%c,u=u,u_supg=u_supg)
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# saveVTK("u.%s.vtu"%c,u=u)