Y[1] = -rho * g
#element spacing
h = Lsup(mesh.getSize())
#boundary conditions for slip at base
boundary_cond = whereZero(coordinates[1]) * [0.0, 1.0] + whereZero(
coordinates[0]) * [1.0, 0.0]
#velocity and pressure vectors
velocity = Vector(0.0, Solution(mesh))
pressure = Scalar(0.0, ReducedSolution(mesh))
#Stokes Cartesian
solution = StokesProblemCartesian(mesh)
solution.setTolerance(tolerance)
while t <= t_end:
print(" ----- Time step = %s -----" % (t))
print("Time = %s seconds" % (time))
solution.initialize(fixed_u_mask=boundary_cond, eta=eta, f=Y)
velocity, pressure = solution.solve(velocity,
pressure,
max_iter=max_iter,
verbose=verbose,
usePCG=True)
print("Max velocity =", Lsup(velocity), "m/s")
velocity = Vector(0.0, ContinuousFunction(mesh)) pressure = Scalar(0.0, ContinuousFunction(mesh)) Y = Vector(0.0,Function(mesh)) #define initial interface between fluids xx = mesh.getX()[0] yy = mesh.getX()[1] func = Scalar(0.0, ContinuousFunction(mesh)) h_interface = Scalar(0.0, ContinuousFunction(mesh)) h_interface = h_interface + (0.02*cos(math.pi*xx/l0) + 0.2) func = yy - h_interface func_new = func.interpolate(ReducedSolution(mesh)) #Stokes Cartesian solution=StokesProblemCartesian(mesh,debug=True) solution.setTolerance(TOL) #level set levelset = LevelSet(mesh, func_new, reinit_max, reinit_each, tolerance, smooth) while t_step <= t_step_end: #update density and viscosity rho = levelset.update_parameter(rho1, rho2) eta = levelset.update_parameter(eta1, eta2) #get velocity and pressure of fluid Y[1] = -rho*g solution.initialize(fixed_u_mask=b_c,eta=eta,f=Y) velocity,pressure=solution.solve(velocity,pressure,max_iter=max_iter,verbose=verbose,useUzawa=useUzawa) #update the interface
# velocity constraints:
#
x=dom.getX()
x0=x[0]
v=DIRECTION*V0/2*(1.-2*(sup(x0)-x0)/(sup(x0)-inf(x0)))*unitVector(0,DIM)
fixed_v_mask=(whereZero(x0-inf(x0))+whereZero(x0-sup(x0)))*unitVector(0,DIM) + \
whereZero(x[DIM-1])*unitVector(DIM-1,DIM)
if DIM==3: fixed_v_mask+=(whereZero(x[1])+whereZero(x[1]-L))*unitVector(1,DIM)
p=Scalar(0.,ReducedSolution(dom))
gamma_dot=sqrt(2.)*length(deviatoric(symmetric(grad(v))))
tau=0.
tau_lsup=0
flow=StokesProblemCartesian(dom)
flow.setTolerance(1.e-5)
while n<1:
print("========= Time step %d ======="%( n+1,))
m=0
dtau_lsup =1.
while dtau_lsup > TOL * tau_lsup:
print("--- iteration step %d ---- "%m)
if n==0 and m==0:
eta_top=ETA_TOP
else:
tau_Y=clip(c*cos(friction_angle)+p*sin(friction_angle), minval=0.)
eta_top=clip(safeDiv(tau_Y,gamma_dot),maxval=ETA_TOP)
print("eta_top=",eta_top)
eta_eff=eta_top*(1-mask_visc) + ETA_BOTTOM*mask_visc
velocity = Vector(0.0, ContinuousFunction(mesh))
pressure = Scalar(0.0, ContinuousFunction(mesh))
Y = Vector(0.0, Function(mesh))
#define initial interface between fluids
xx = mesh.getX()[0]
yy = mesh.getX()[1]
func = Scalar(0.0, ContinuousFunction(mesh))
h_interface = Scalar(0.0, ContinuousFunction(mesh))
h_interface = h_interface + (0.02 * cos(math.pi * xx / l0) + 0.2)
func = yy - h_interface
func_new = func.interpolate(ReducedSolution(mesh))
#Stokes Cartesian
solution = StokesProblemCartesian(mesh, debug=True)
solution.setTolerance(TOL)
#level set
levelset = LevelSet(mesh, func_new, reinit_max, reinit_each, tolerance, smooth)
while t_step <= t_step_end:
#update density and viscosity
rho = levelset.update_parameter(rho1, rho2)
eta = levelset.update_parameter(eta1, eta2)
#get velocity and pressure of fluid
Y[1] = -rho * g
solution.initialize(fixed_u_mask=b_c, eta=eta, f=Y)
velocity, pressure = solution.solve(velocity,
pressure,
max_iter=max_iter,
x0 = x[0]
v = DIRECTION * V0 / 2 * (1. - 2 * (sup(x0) - x0) /
(sup(x0) - inf(x0))) * unitVector(0, DIM)
fixed_v_mask=(whereZero(x0-inf(x0))+whereZero(x0-sup(x0)))*unitVector(0,DIM) + \
whereZero(x[DIM-1])*unitVector(DIM-1,DIM)
if DIM == 3:
fixed_v_mask += (whereZero(x[1]) + whereZero(x[1] - L)) * unitVector(
1, DIM)
p = Scalar(0., ReducedSolution(dom))
gamma_dot = sqrt(2.) * length(deviatoric(symmetric(grad(v))))
tau = 0.
tau_lsup = 0
flow = StokesProblemCartesian(dom)
flow.setTolerance(1.e-5)
while n < 1:
print("========= Time step %d =======" % (n + 1, ))
m = 0
dtau_lsup = 1.
while dtau_lsup > TOL * tau_lsup:
print("--- iteration step %d ---- " % m)
if n == 0 and m == 0:
eta_top = ETA_TOP
else:
tau_Y = clip(c * cos(friction_angle) + p * sin(friction_angle),
minval=0.)
eta_top = clip(safeDiv(tau_Y, gamma_dot), maxval=ETA_TOP)
print("eta_top=", eta_top)