def analytical_displacement(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
Uf = mObj.fluid_velocity
epsf = mObj.porosity
dp = mObj.diameter
rhop = mObj.density
kn = mObj.kn
ylo = mObj.ylo
yhi = mObj.yhi
s = mObj.lattice_scale
g = -mObj.gravity
# Obtain the pressure gradient across sample, and the inlet pressure
# (assuming that the outlet pressure is zero)
if dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf/epsf, Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf/epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
fdi = fObj.calculate_drag_force(Uf=Uf/epsf, Vp=0.)
volume = (np.pi/6)*dp**3
fi = volume*rhop*g - volume*rhof*g + fdi
H = yhi-ylo
N = H/s
disp = 0.5*N*(N+1)*fi/kn
xySol = (yhi - 0.5*dp) + disp
return xySol
def analytical_displacement(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
Uf = mObj.fluid_velocity
epsf = mObj.epsf
dp = mObj.diameter
rhop = mObj.density
kn = mObj.kn
y0 = mObj.y0
g = -mObj.gravity
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf,
rhof=rhof,
epsf=epsf,
dp=dp,
Uf=Uf / epsf,
Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
fdi = fObj.calculate_drag_force(Uf=Uf / epsf, Vp=0.)
volume = (np.pi / 6) * dp**3
fi = volume * rhop * g - volume * rhof * g + fdi
disp = fi / kn
xySol = y0 + disp
return xySol
def analytical_pressure(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
Uf = mObj.Uf
dp = mObj.diameter
epsf = mObj.epsf
xyzL = mObj.xyzL
xyz_orig = mObj.xyz_orig
# Obtain the pressure gradient across sample, and the inlet pressure
# (assuming that the outlet pressure is zero)
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf,
rhof=rhof,
epsf=epsf,
dp=dp,
Uf=Uf / epsf,
Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ('Unknown drag force model specified')
gradP = fObj.calculate_pressure_gradient(Uf=Uf / epsf, Vp=0.)
pSol = gradP * (xyzL[1] - xyz_orig[1])
return pSol
def analytical_pressure(mObj):
dragModel = mObj.dragModel
muf = mObj.muf
rhof = mObj.rhof
Uf = mObj.Uf
dp = mObj.dp
epsf = mObj.epsf
xyzL = mObj.xyzL
xyz_orig = mObj.xyz_orig
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf,
rhof=rhof,
epsf=epsf,
dp=dp,
Uf=Uf / epsf,
Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
gradP = fObj.calculate_pressure_gradient(Uf=Uf / epsf, Vp=0.)
pSol = gradP * (xyzL[1] - xyz_orig[1])
return pSol
def analytical_pressure_displacement(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
Uf = mObj.Uf
epsf = mObj.epsf
dp = mObj.diameter
rhop = mObj.density
kn = mObj.kn
ylo = mObj.ylo
yhi = mObj.yhi
s = mObj.lattice_scale
g = -mObj.gravity
# Obtain the pressure gradient across sample, and the inlet pressure
# (assuming that the outlet pressure is zero). Note that pSol is the
# pressure at the outlet due to the drag force only and does not include
# any contribution of the pressure gradient due to the presence of
# gravity. This is added on when we get to the settlement calculation
# below.
if dragModel == 'DiFelice':
fObj = DiFelice(muf=muf,
rhof=rhof,
epsf=epsf,
dp=dp,
Uf=Uf / epsf,
Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
gradP = fObj.calculate_pressure_gradient(Uf=Uf / epsf, Vp=0.)
H = yhi - ylo
pSol = gradP * H
fdi = fObj.calculate_drag_force(Uf=Uf / epsf, Vp=0.)
volume = (np.pi / 6) * dp**3
fi = volume * rhop * g - volume * rhof * g + fdi / epsf
N = H / s
disp = 0.5 * N * (N + 1) * fi / kn
xySol = (yhi - 0.5 * dp) + disp
return pSol, xySol
def analytical_force(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
dp = mObj.diameter
vy0 = mObj.vy0
epsf = mObj.epsf
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
else:
raise ValueError('Unknown drag force model specified')
fySol = fObj.calculate_drag_force(Uf=0., Vp=vy0)
return fySol
def analytical_displacement(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
Uf = mObj.Uf
epsf = mObj.epsf
dp = mObj.diameter
rhop = mObj.density
kn = mObj.kn
y0 = mObj.y0
g = -mObj.gravity
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf,
rhof=rhof,
epsf=epsf,
dp=dp,
Uf=Uf / epsf,
Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ('Unknown drag force model specified')
if y0 < 1.0:
CORRECTION_FACTOR = 0.5
else:
CORRECTION_FACTOR = 1.0
fdi = fObj.calculate_drag_force(Uf=Uf / epsf, Vp=0.)
print(fdi)
volume = (np.pi / 6) * dp**3
fi = volume * rhop * g - CORRECTION_FACTOR * volume * rhof * g + CORRECTION_FACTOR * fdi
disp = fi / kn
xySol = y0 + disp
return xySol
def analytical_force(mObj):
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
dp = mObj.diameter
vy0 = mObj.vy0
# Note cell volume hard-wired (for ease)
CELL_VOLUME = 0.1**3
epsf = (CELL_VOLUME - (np.pi / 6) * dp**3) / CELL_VOLUME
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
else:
raise ValueError('Unknown drag force model specified')
fySol = fObj.calculate_drag_force(Uf=0., Vp=vy0)
return fySol
# Extract relevant parameters from the LAMMPS input script.
mObj = LAMMPS_Input('./lammps/constant.in')
dragModel = mObj.dragModel
muf = mObj.dynamic_viscosity
rhof = mObj.fluid_density
dp = mObj.diameter
vy0 = mObj.vy0
CELL_VOLUME = ((xyzL[0] - xyz_orig[0]) / ncxyz[0]) * (
(xyzL[1] - xyz_orig[1]) / ncxyz[1]) * ((xyzL[2] - xyz_orig[2]) / ncxyz[2])
epsf = (CELL_VOLUME - (np.pi / 6) * (dp**3)) / CELL_VOLUME
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=0., Vp=vy0)
else:
raise ValueError('Unknown drag force model specified')
# initialise MPI
comm = MPI.COMM_WORLD
# Initialise CPL
CPL = CPL()
CFD_COMM = CPL.init(CPL.CFD_REALM)
cart_comm = CFD_COMM.Create_cart([npxyz[0], npxyz[1], npxyz[2]])
CPL.setup_cfd(cart_comm, xyzL, xyz_orig, ncxyz)
# Setup send and recv buffers
comm = MPI.COMM_WORLD
# Initialise CPL
CPL = CPL()
MD_COMM = CPL.init(CPL.MD_REALM)
CPL.setup_md(MD_COMM.Create_cart([npxyz[0], npxyz[1], npxyz[2]]), xyzL,
xyz_orig)
# Setup send and recv buffers
recvbuf, sendbuf = CPL.get_arrays(recv_size=9, send_size=8)
# Setup drag force object
if dragModel == 'Drag' or dragModel == 'Stokes':
fObj = Stokes(muf=muf, epsf=epsf, dp=dp)
elif dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf / epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
# Main time loop
for time in range(200):
print(time)
# Recv data:
# [Ux, Uy, Uz, gradPx, gradPy, gradPz, divTaux, divTauy, divTauz]
recvbuf, ierr = CPL.recv(recvbuf)
# Zero send buffer. Set the sum of drag coeff and particle volumes only
# (noting that CPLSocketFOAM divides by sample volume). Assumes entire
# initialise MPI
comm = MPI.COMM_WORLD
# Initialise CPL
CPL = CPL()
CFD_COMM = CPL.init(CPL.CFD_REALM)
cart_comm = CFD_COMM.Create_cart([npxyz[0], npxyz[1], npxyz[2]])
CPL.setup_cfd(cart_comm, xyzL, xyz_orig, ncxyz)
# Setup send and recv buffers
recvbuf, sendbuf = CPL.get_arrays(recv_size=8, send_size=9)
# Setup drag force object
if dragModel == 'DiFelice':
fObj = DiFelice(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf/epsf, Vp=0.)
elif dragModel == 'Ergun':
fObj = Ergun(muf=muf, rhof=rhof, epsf=epsf, dp=dp, Uf=Uf/epsf, Vp=0.)
else:
raise ValueError('Unknown drag force model specified')
# Main time loop
for time in range(400):
# print(time)
if time == 0:
Vp = np.array([0.0])
# Update drag coefficients for new particle velocities and calculate gradient
# due to drag forces.