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Reference state for AuxiliaryBlockPC #201

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Sep 3, 2024
Merged

Reference state for AuxiliaryBlockPC #201

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40 changes: 28 additions & 12 deletions asQ/preconditioners/auxiliary_blockpc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,11 @@ def _setup(self, pc, v, u):
self.prefix = pc.getOptionsPrefix() + self._prefix
self.options = PETSc.Options(self.prefix)

self.uref = appctx.get('uref')
assert self.uref.function_space() == u.function_space()
uref = appctx.get('uref')
self.uref = appctx.get('aux_uref', uref)
self.u = fd.Function(u.function_space())

self.frozen = self.options.getBool("frozen", default=False)

self.bcs = appctx['bcs']
self.tref = appctx['tref']
Expand All @@ -26,6 +29,12 @@ def _setup(self, pc, v, u):
self.form_mass = appctx.get('aux_form_mass', form_mass)
self.form_function = appctx.get('aux_form_function', form_function)

def update(self, pc):
if not self.frozen:
self.update_state(pc)
super().update(pc)
return


class AuxiliaryRealBlockPC(AuxiliaryBlockPCBase):
"""
Expand Down Expand Up @@ -57,16 +66,20 @@ class AuxiliaryRealBlockPC(AuxiliaryBlockPCBase):
'aux_theta': <float>
Alternative implicit theta parameter.
"""
def update_state(self, pc):
self.u.assign(self.uref)

def form(self, pc, v, u):
self._setup(pc, v, u)
self.update_state(pc)

dt = self.appctx['dt']
theta = self.appctx['theta']

dt = self.options.getReal('dt', default=dt)
theta = self.options.getReal('theta', default=theta)

us = fd.split(self.uref)
us = fd.split(self.u)
vs = fd.split(v)

dt1 = fd.Constant(1/dt)
Expand All @@ -75,7 +88,7 @@ def form(self, pc, v, u):
M = self.form_mass(*fd.split(u), *vs)

F = self.form_function(*us, *vs, self.tref)
K = fd.derivative(F, self.uref)
K = fd.derivative(F, self.u)

a = dt1*M + thet*K

Expand Down Expand Up @@ -118,10 +131,18 @@ class AuxiliaryComplexBlockPC(AuxiliaryBlockPCBase):
'aux_d2i': <float>
Imaginary part of an alternative complex coefficient on the stiffness matrix.
"""
def update_state(self, pc):
if self.u.function_space() == self.uref.function_space():
self.u.assign(self.uref)
else:
self.cpx.set_real(self.u, self.uref)
self.cpx.set_imag(self.u, self.uref)

def form(self, pc, v, u):
self._setup(pc, v, u)

cpx = self.appctx['cpx']
self.cpx = cpx
self.update_state(pc)

d1 = self.appctx['d1']
d2 = self.appctx['d2']
Expand All @@ -138,15 +159,10 @@ def form(self, pc, v, u):

# complex and real valued function spaces
W = v.function_space()
V = W.sub(0)

bcs = tuple((cb
for bc in self.bcs
for cb in cpx.DirichletBC(W, V, bc, 0*bc.function_arg)))

M = cpx.BilinearForm(W, d1, self.form_mass)
K = cpx.derivative(d2, partial(self.form_function, t=self.tref), self.uref)
K = cpx.derivative(d2, partial(self.form_function, t=self.tref), self.u)

a = M + K

return (a, bcs)
return (a, self.bcs)
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