def mesh(geometry, element):
Lx = 100.
Ly = 100.
H = 100.
deltax = Lx / 5.
deltay = Ly / 5.
deltaz = H / 5.
ncolumnsy = int(Ly/deltay)
ncolumnsx = int(Lx/deltax)
nlayers = int(H/deltaz)
quadrilateral = True if element == "quadrilateral" else False
if geometry == "periodic-in-both":
m = PeriodicRectangleMesh(ncolumnsx, ncolumnsy, Lx, Ly,
direction='both', quadrilateral=quadrilateral)
elif geometry == "periodic-in-x":
m = PeriodicRectangleMesh(ncolumnsx, ncolumnsy, Lx, Ly,
direction='x', quadrilateral=quadrilateral)
elif geometry == "periodic-in-y":
m = PeriodicRectangleMesh(ncolumnsx, ncolumnsy, Lx, Ly,
direction='y', quadrilateral=quadrilateral)
elif geometry == "non-periodic":
m = RectangleMesh(ncolumnsx, ncolumnsy, Lx, Ly, quadrilateral=quadrilateral)
extruded_mesh = ExtrudedMesh(m, layers=nlayers, layer_height=deltaz)
return extruded_mesh
def setup_2d_recovery(dirname):
L = 100.
W = 100.
deltax = L / 5.
deltay = W / 5.
ncolumnsx = int(L / deltax)
ncolumnsy = int(W / deltay)
mesh = PeriodicRectangleMesh(ncolumnsx,
ncolumnsy,
L,
W,
direction='y',
quadrilateral=True)
x, y = SpatialCoordinate(mesh)
# spaces
VDG0 = FunctionSpace(mesh, "DG", 0)
VCG1 = FunctionSpace(mesh, "CG", 1)
VDG1 = FunctionSpace(mesh, "DG", 1)
Vu = FunctionSpace(mesh, "RTCF", 1)
VuCG1 = VectorFunctionSpace(mesh, "CG", 1)
VuDG1 = VectorFunctionSpace(mesh, "DG", 1)
# set up initial conditions
np.random.seed(0)
expr = np.random.randn() + np.random.randn() * x
# our actual theta and rho and v
rho_CG1_true = Function(VCG1).interpolate(expr)
v_CG1_true = Function(VuCG1).interpolate(as_vector([expr, expr]))
# make the initial fields by projecting expressions into the lowest order spaces
rho_DG0 = Function(VDG0).interpolate(expr)
rho_CG1 = Function(VCG1)
v_Vu = Function(Vu).project(as_vector([expr, expr]))
v_CG1 = Function(VuCG1)
# make the recoverers and do the recovery
rho_recoverer = Recoverer(rho_DG0,
rho_CG1,
VDG=VDG1,
boundary_method=Boundary_Method.dynamics)
v_recoverer = Recoverer(v_Vu,
v_CG1,
VDG=VuDG1,
boundary_method=Boundary_Method.dynamics)
rho_recoverer.project()
v_recoverer.project()
rho_diff = errornorm(rho_CG1, rho_CG1_true) / norm(rho_CG1_true)
v_diff = errornorm(v_CG1, v_CG1_true) / norm(v_CG1_true)
return (rho_diff, v_diff)
def mesh(geometry, element):
Lx = 100.
Ly = 100.
deltax = Lx / 5.
deltay = Ly / 5.
ncolumnsy = int(Ly / deltay)
ncolumnsx = int(Lx / deltax)
quadrilateral = True if element == "quadrilateral" else False
if geometry == "periodic-in-both":
m = PeriodicRectangleMesh(ncolumnsx,
ncolumnsy,
Lx,
Ly,
direction='both',
quadrilateral=quadrilateral)
elif geometry == "periodic-in-x":
m = PeriodicRectangleMesh(ncolumnsx,
ncolumnsy,
Lx,
Ly,
direction='x',
quadrilateral=quadrilateral)
elif geometry == "periodic-in-y":
m = PeriodicRectangleMesh(ncolumnsx,
ncolumnsy,
Lx,
Ly,
direction='y',
quadrilateral=quadrilateral)
elif geometry == "non-periodic":
m = RectangleMesh(ncolumnsx,
ncolumnsy,
Lx,
Ly,
quadrilateral=quadrilateral)
return m
def setup_gw(dirname):
nlayers = 10 # horizontal layers
columns = 30 # number of columns
L = 1.e5
m = PeriodicRectangleMesh(columns, 1, L, 1.e4, quadrilateral=True)
dt = 6.0
# build volume mesh
H = 1.0e4 # Height position of the model top
mesh = ExtrudedMesh(m, layers=nlayers, layer_height=H / nlayers)
fieldlist = ['u', 'p', 'b']
timestepping = TimesteppingParameters(dt=dt)
output = OutputParameters(dirname=dirname + "/gw_incompressible",
dumplist=['u'],
dumpfreq=5)
parameters = CompressibleParameters()
state = State(mesh,
vertical_degree=1,
horizontal_degree=1,
family="RTCF",
timestepping=timestepping,
output=output,
parameters=parameters,
fieldlist=fieldlist)
# Initial conditions
u0 = state.fields("u")
p0 = state.fields("p")
b0 = state.fields("b")
# z.grad(bref) = N**2
x, y, z = SpatialCoordinate(mesh)
N = parameters.N
bref = z * (N**2)
b_b = Function(b0.function_space()).interpolate(bref)
b0.interpolate(b_b)
incompressible_hydrostatic_balance(state, b0, p0)
state.initialise([('u', u0), ('p', p0), ('b', b0)])
# Set up forcing
forcing = IncompressibleForcing(state)
return state, forcing
ExtrudedMesh, exp, sin, Function)
import numpy as np
import sys
dt = 25.
if '--running-tests' in sys.argv:
nlayers = 5 # horizontal layers
columns = 50 # number of columns
tmax = dt
else:
nlayers = 10 # horizontal layers
columns = 150 # number of columns
tmax = 60000.0
L = 6.0e6
m = PeriodicRectangleMesh(columns, 1, L, 1.e4, quadrilateral=True)
# build volume mesh
H = 1.0e4 # Height position of the model top
mesh = ExtrudedMesh(m, layers=nlayers, layer_height=H / nlayers)
fieldlist = ['u', 'rho', 'theta']
timestepping = TimesteppingParameters(dt=dt)
dirname = 'sk_hydrostatic'
output = OutputParameters(dirname=dirname,
dumpfreq=50,
dumplist=['u'],
perturbation_fields=['theta', 'rho'],
log_level='INFO')
def setup_3d_recovery(dirname):
L = 3.
H = 3.
W = 3.
deltax = L / 3.
deltay = W / 3.
deltaz = H / 3.
nlayers = int(H / deltaz)
ncolumnsx = int(L / deltax)
ncolumnsy = int(W / deltay)
m = PeriodicRectangleMesh(ncolumnsx,
ncolumnsy,
L,
W,
direction='y',
quadrilateral=True)
mesh = ExtrudedMesh(m, layers=nlayers, layer_height=H / nlayers)
x, y, z = SpatialCoordinate(mesh)
# horizontal base spaces
cell = mesh._base_mesh.ufl_cell().cellname()
u_hori = FiniteElement("RTCF", cell, 1)
w_hori = FiniteElement("DG", cell, 0)
# vertical base spaces
u_vert = FiniteElement("DG", interval, 0)
w_vert = FiniteElement("CG", interval, 1)
# build elements
u_element = HDiv(TensorProductElement(u_hori, u_vert))
w_element = HDiv(TensorProductElement(w_hori, w_vert))
theta_element = TensorProductElement(w_hori, w_vert)
v_element = u_element + w_element
# spaces
VDG0 = FunctionSpace(mesh, "DG", 0)
VCG1 = FunctionSpace(mesh, "CG", 1)
VDG1 = FunctionSpace(mesh, "DG", 1)
Vt = FunctionSpace(mesh, theta_element)
Vt_brok = FunctionSpace(mesh, BrokenElement(theta_element))
Vu = FunctionSpace(mesh, v_element)
VuCG1 = VectorFunctionSpace(mesh, "CG", 1)
VuDG1 = VectorFunctionSpace(mesh, "DG", 1)
# set up initial conditions
np.random.seed(0)
expr = np.random.randn() + np.random.randn() * x + np.random.randn(
) * z + np.random.randn() * x * z
# our actual theta and rho and v
rho_CG1_true = Function(VCG1).interpolate(expr)
theta_CG1_true = Function(VCG1).interpolate(expr)
v_CG1_true = Function(VuCG1).interpolate(as_vector([expr, expr, expr]))
rho_Vt_true = Function(Vt).interpolate(expr)
# make the initial fields by projecting expressions into the lowest order spaces
rho_DG0 = Function(VDG0).interpolate(expr)
rho_CG1 = Function(VCG1)
theta_Vt = Function(Vt).interpolate(expr)
theta_CG1 = Function(VCG1)
v_Vu = Function(Vu).project(as_vector([expr, expr, expr]))
v_CG1 = Function(VuCG1)
rho_Vt = Function(Vt)
# make the recoverers and do the recovery
rho_recoverer = Recoverer(rho_DG0,
rho_CG1,
VDG=VDG1,
boundary_method=Boundary_Method.dynamics)
theta_recoverer = Recoverer(theta_Vt,
theta_CG1,
VDG=VDG1,
boundary_method=Boundary_Method.dynamics)
v_recoverer = Recoverer(v_Vu,
v_CG1,
VDG=VuDG1,
boundary_method=Boundary_Method.dynamics)
rho_Vt_recoverer = Recoverer(rho_DG0,
rho_Vt,
VDG=Vt_brok,
boundary_method=Boundary_Method.physics)
rho_recoverer.project()
theta_recoverer.project()
v_recoverer.project()
rho_Vt_recoverer.project()
rho_diff = errornorm(rho_CG1, rho_CG1_true) / norm(rho_CG1_true)
theta_diff = errornorm(theta_CG1, theta_CG1_true) / norm(theta_CG1_true)
v_diff = errornorm(v_CG1, v_CG1_true) / norm(v_CG1_true)
rho_Vt_diff = errornorm(rho_Vt, rho_Vt_true) / norm(rho_Vt_true)
return (rho_diff, theta_diff, v_diff, rho_Vt_diff)
plt.savefig("plots/SquareMesh.png")
# -> UnitSquareMesh
# -----------------
# possible use of quadrilateral elements
mesh = UnitSquareMesh(nx, ny, quadrilateral=not quad)
triplot(mesh)
plt.legend()
plt.savefig("plots/UnitSquareMesh.png")
# -> PeriodicRectangleMesh
# ------------------------
# possible use of quadrilateral elements
mesh = PeriodicRectangleMesh(nx+1, ny, Lx, Ly)
triplot(mesh)
plt.legend()
plt.savefig("plots/PeriodicRectangleMesh.png")
# -> PeriodicSquareMesh
# ------------------------
# possible use of quadrilateral elements
mesh = PeriodicSquareMesh(nx, ny, Lx, direction="x")
triplot(mesh)
plt.legend()
plt.savefig("plots/PeriodicSquareMesh.png")
# -> PeriodicUnitSquareMesh
