def _get_boundary_elems(self):
#
# boundary elements are defined as cells that are
# contain both positive and negative values of the level set function
# and are crossed with the domain boundary.
#
b_elems_grid = logical_and(nfabs(self.bls_elem_grid) < 4,
nfabs(self.ls_elem_grid) < 4)
return self._get_elems_from_elem_grid(b_elems_grid)
def _get_boundary_elems(self):
#
# boundary elements are defined as cells that are
# contain both positive and negative values of the level set function
# and are crossed with the domain boundary.
#
b_elems_grid = logical_and(
nfabs(self.bls_elem_grid) < 4,
nfabs(self.ls_elem_grid) < 4)
return self._get_elems_from_elem_grid(b_elems_grid)
def __call__(self, points):
'''Return the global coordinates of the supplied local points.
'''
# number of local grid points for each coordinate direction
# values must range between 0 and 1
# xi, yi, zi = points[:,0], points[:,1], points[:,2]
X = points[:, 0]
dist = X - self.C
R = X[1] - X[0]
c = 0.1
alpha = c + (1 - c) / R * dist
Xn = X - sign(dist) * alpha * dist
X_idx = where(nfabs(dist) > self.R)[0]
Xn[X_idx] = X[X_idx]
p = copy(points)
p[:, 0] = Xn
return points
def _get_ls_mask(self):
# make the intersection
#
# Three conditions must be fulfilled:
# 1) The absolute value of the level summation on the element is less than
# the number of the corner nodes
#
# 2) At least one value of the boundary level set must be positive within the element
# i.e. the sum within the element is greater than -(number of corner nodes)
#
# 3) The element must be valid also in the parent grid
#
# True - are the masked elements, False are the active elements
#
ls_mask = logical_and(
nfabs(self.ls_edge_sum_grid) < 4,
self.bls_edge_sum_grid > -4) == False
if isinstance(self.fe_grid, FEGrid):
n_grid_elems = self.fe_grid.n_grid_elems
parent_ls_mask = repeat(False,
n_grid_elems).reshape(self.fe_grid.shape)
else:
parent_ls_mask = self.fe_grid.ls_mask
return logical_or(parent_ls_mask, ls_mask)
def __call__(self, points):
"""Return the global coordinates of the supplied local points.
"""
# number of local grid points for each coordinate direction
# values must range between 0 and 1
# xi, yi, zi = points[:,0], points[:,1], points[:,2]
X = points[:, 0]
dist = X - self.C
R = X[1] - X[0]
c = 0.1
alpha = c + (1 - c) / R * dist
Xn = X - sign(dist) * alpha * dist
X_idx = where(nfabs(dist) > self.R)[0]
Xn[X_idx] = X[X_idx]
p = copy(points)
p[:, 0] = Xn
return points
def _get_ls_mask(self):
# make the intersection
#
# Three conditions must be fulfilled:
# 1) The absolute value of the level summation on the element is less than
# the number of the corner nodes
#
# 2) At least one value of the boundary level set must be positive within the element
# i.e. the sum within the element is greater than -(number of corner nodes)
#
# 3) The element must be valid also in the parent grid
#
# True - are the masked elements, False are the active elements
#
ls_mask = logical_and(nfabs(self.ls_edge_sum_grid) < 4,
self.bls_edge_sum_grid > -4) == False
if isinstance(self.fe_grid, FEGrid):
n_grid_elems = self.fe_grid.n_grid_elems
parent_ls_mask = repeat(
False, n_grid_elems).reshape(self.fe_grid.shape)
else:
parent_ls_mask = self.fe_grid.ls_mask
return logical_or(parent_ls_mask, ls_mask)
def _get_interior_elems(self):
# evaluate the boundary operator - with a result boolean array
# in the corner nodes.
#
b_elem_grid = self.bls_elem_grid
ls_elem_grid = self.ls_elem_grid
# make the intersection
#
elem_grid = logical_and(nfabs(ls_elem_grid) < 4, b_elem_grid == 4)
return self._get_elems_from_elem_grid(elem_grid)
def _get_interior_elems(self):
# evaluate the boundary operator - with a result boolean array
# in the corner nodes.
#
b_elem_grid = self.bls_elem_grid
ls_elem_grid = self.ls_elem_grid
# make the intersection
#
elem_grid = logical_and(nfabs(ls_elem_grid) < 4, b_elem_grid == 4)
return self._get_elems_from_elem_grid(elem_grid)
