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ex04_ventricle-NP.py
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ex04_ventricle-NP.py
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'''
Coupled large strain poroelasticity and chemotaxis
Holzapfel material law. Fibers are rule-based generated
Replicating initial 2D test now in the ventricle
P1b-P1-P1 discretisation for displ-porosity-pressure
P1-P1 elements for the chemotaxis
Backward Euler scheme for the time discretisation
'''
from fenics import *
parameters["form_compiler"]["representation"] = "uflacs"
parameters["allow_extrapolation"] = True
parameters["form_compiler"]["cpp_optimize"] = True
parameters["form_compiler"]["quadrature_degree"] = 2
# parameter-dependent functions
varAngle = lambda s : ((thetaEpi - thetaEndo) * s + thetaEndo)/ 180.0 * pi
normalizeAndProj_vec = lambda u : project(u/sqrt(dot(u,u)+0.001),FiberSpace)
normalize_vec = lambda u : u/sqrt(dot(u,u))
subplus = lambda u : conditional(ge(u, 0.0), u, 0.0)
kappa = lambda J,phi: kappa0*(1 + (1-phi0)**2/phi0**3*J*phi**3*(J-phi)**2) # isotropic Kozeny-Carman
react_p = lambda phi,cp,cl: phi*cp*(gammap - lmbdrp*cl)
react_l = lambda phi,cp,cl: phi*cp*cl * lmbdpr
ell = lambda p, cp: Sv*Lp0*(1.0+Lbp*cp) * (pc - p - sigma0*(pic-pii)/(1.+Lbp*cp)) \
- l0*(1.+vmax*(p-p0)**nHill/(km**nHill+(p-p0)**nHill))
# time constants
t = 0.0
dt = 0.05
Tfinal = 40.
freqsave = 50
cont = 0
# ********* model constants ******* #
E = Constant(60.)
nu = Constant(0.35)
lmbdas = Constant(E*nu/((1. + nu)*(1. - 2.*nu)))
rhos = Constant(2.e-3)
rhof = Constant(1.e-3)
kappa0 = Constant(2.5e-7)
phi0 = Constant(0.2)
alpha = Constant(0.3)
muf = Constant(1.e-3)
bb = Constant((0, 0, 0))
Dp = Constant(5.e-3/phi0)
Dl = Constant(1.e-2/phi0)
Lp0 = Constant(3.6e-8)
sigma0 = Constant(0.91)
vmax = Constant(20.)
p0 = Constant(10.9)
pic = Constant(20.)
pii = Constant(10.)
pc = Constant(20.)
km = Constant(0.5)
chi = Constant(0.05)
nHill = Constant(5.)
I = Identity(3)
Lbp = Constant(5000.)
Sv = Constant(174.)
l0 = Constant(6.82e-5)
gammap = Constant(0.13/phi0)
lmbdrp = Constant(1.8/phi0)
lmbdpr = Constant(7.1/phi0)
# Holzapfel-Ogden
a = Constant(0.496)
b = Constant(0.041)
a_f = Constant(0.193)
b_f = Constant(0.176)
a_s = Constant(0.123)
b_s = Constant(0.209)
a_fs = Constant(0.162)
b_fs = Constant(0.166)
# ********* Mesh and I/O ********* #
mesh = Mesh("meshes/newVentr.xml")
bdry = MeshFunction("size_t", mesh, "meshes/newVentr_facet_region.xml")
base = 8
epi = 7
endo = 6
ds = Measure("ds", subdomain_data=bdry) # epi:7, endo:6, base: 8
nn = FacetNormal(mesh)
fileO = XDMFFile(mesh.mpi_comm(), "outputs/CoupledEdemaVentricle-NP.xdmf")
fileO.parameters['rewrite_function_mesh'] = False
fileO.parameters["functions_share_mesh"] = True
fileO.parameters["flush_output"] = True
# ********* Finite dimensional spaces ********* #
P1 = FiniteElement("CG", mesh.ufl_cell(), 1)
Bub = FiniteElement("Bubble", mesh.ufl_cell(), 4)
P1b = VectorElement(P1 + Bub)
P2vec = VectorElement("CG", mesh.ufl_cell(), 1)
Hh = FunctionSpace(mesh, MixedElement([P1, P1, P2vec, P1, P1]))
print("**************** Total Dofs = ", Hh.dim())
Sol = Function(Hh)
dSol = TrialFunction(Hh)
cp, cl, u, phi, p = split(Sol)
wp, wl, v, psi, q = TestFunctions(Hh)
Mh = FunctionSpace(mesh, P1)
FiberSpace = VectorFunctionSpace(mesh, "CG", 1)
Vh = FunctionSpace(mesh, P1b)
etah = Function(Mh)
# ******* Generate fibre and sheet directions ********** #
# n0 fibre, s0 sheetlets, n0 normal directions
phif = TrialFunction(Mh)
psif = TestFunction(Mh)
aDif = Constant(10.)
AAf = aDif*dot(grad(phif), grad(psif))*dx
ggf = Constant(0.0)
BBf = ggf * psif * dx
bcphiEn = DirichletBC(Mh, Constant(0.0), bdry, endo)
bcphiEp = DirichletBC(Mh, Constant(1.0), bdry, epi)
bcphi = [bcphiEp, bcphiEn]
solve(AAf == BBf, etah, bcphi,
solver_parameters={'linear_solver': 'mumps'})
s0 = normalizeAndProj_vec(grad(etah))
k0 = Constant((0, 0, 1))
kp = normalize_vec(k0 - dot(k0, s0) * s0)
f0flat = cross(s0, kp)
thetaEpi = Constant(-20.0)
thetaEndo = Constant(30.0)
f0 = normalizeAndProj_vec(f0flat*cos(varAngle(etah))
+ cross(s0, f0flat)*sin(varAngle(etah))
+ s0 * dot(s0, f0flat)*(1.0-cos(varAngle(etah))))
n0 = cross(f0, s0)
# ******* Boundary conditions ********** #
pendo = Expression('0.5*p0*sin(pi/40*t)*sin(pi/40*t)', p0=p0, t=t, degree=0)
u_D = project(Constant((0, 0, 0)), Hh.sub(2).collapse())
bcU = DirichletBC(Hh.sub(2), u_D, bdry, base)
bcP1 = DirichletBC(Hh.sub(4), pendo, bdry, endo)
bcP2 = DirichletBC(Hh.sub(4), p0, bdry, epi)
bcH = [bcU, bcP1, bcP2]
# ******* Initial conditions ********** #
cp0 = Expression(
'(x[0]-0.13047)*(x[0]-0.13047)+(x[1]-3.05269)*(x[1]-3.05269)<= 0.24 ? 0.002:0.0', degree=1)
cpold = interpolate(cp0, Hh.sub(0).collapse())
clold = interpolate(Constant(0.003), Hh.sub(1).collapse())
uold = project(Constant((0, 0, 0)), Hh.sub(2).collapse())
phiold = project(phi0, Hh.sub(3).collapse())
pold = interpolate(p0, Hh.sub(4).collapse())
# ******** Weak form ********** #
ndim = u.geometric_dimension()
F = I + grad(u)
J = det(F)
invF = inv(F)
C = F.T*F
B = F*F.T
I1 = tr(C)
I8_fs = inner(f0, C*s0)
I4_f = inner(f0, C*f0)
I4_s = inner(s0, C*s0)
sig = a*exp(b*subplus(I1-ndim))*B \
+ 2*a_f*(I4_f-1)*exp(b_f*subplus(I4_f-1)**2)*outer(F*f0, F*f0) \
+ 2*a_s*(I4_s-1)*exp(b_s*subplus(I4_s-1)**2)*outer(F*s0, F*s0) \
+ a_fs*I8_fs*exp(b_fs*subplus(I8_fs)**2)*(outer(F*f0, F*s0)
+ outer(F*s0, F*f0))
Peff = J*sig*invF.T + lmbdas*ln(J)*invF.T
# Poromechanics
F1 = inner(Peff - alpha*p*J*invF.T, grad(v)) * dx \
+ psi*(J-1-phi+phi0)*dx \
+ rhof*J/dt*(phi-phiold)*q * dx \
+ dot(phi*J*invF*kappa(J, phi)/muf*invF.T*grad(p), grad(q)) * dx \
- rhos*dot(bb, v) * dx \
- rhof*J*ell(p, cp)*q*dx
# Chemotaxis
F2 = J/dt*((phi-phiold)*cp+phi*(cp-cpold))*wp*dx \
+ dot(phi*J*invF*Dp*invF.T*grad(cp), grad(wp)) * dx \
- J*react_p(phi, cp, cl)*wp*dx \
+ J/dt*((phi-phiold)*cl+phi*(cl-clold))*wl*dx \
+ dot(phi*J*invF*Dl*invF.T*grad(cl), grad(wl)) * dx \
- dot(phi*chi*cl*J*invF*invF.T*grad(cp), grad(wl)) * dx \
- J*react_l(phi, cp, cl)*wl*dx
FF = F1 + F2
Tang = derivative(FF, Sol, dSol)
# ********* Time loop ************* #
while (t < Tfinal):
t += dt
pendo.t = t
print("t=%.2f" % t)
# ********* Solving ************* #
solve(FF == 0, Sol, J=Tang, bcs=bcH,
solver_parameters={'newton_solver': {'linear_solver': 'mumps',
'absolute_tolerance': 1.0e-7,
'relative_tolerance': 1.0e-7}})
cph, clh, uh, phih, ph = Sol.split()
# ********* Writing ************* #
if (cont % freqsave == 0):
cph.rename("cp", "cp")
fileO.write(cph, t)
clh.rename("cl", "cl")
fileO.write(clh, t)
ph.rename("p", "p")
fileO.write(ph, t)
uh.rename("u", "u")
fileO.write(uh, t)
phih.rename("phi", "phi")
fileO.write(phih, t)
cont += 1
# ********* Updating ************* #
assign(cpold, cph)
assign(clold, clh)
assign(uold, uh)
assign(phiold, phih)
assign(pold, ph)
# ************* End **************** #