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_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.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_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
xyz_orig = np.array(xyz_orig, order='F', dtype=np.float64) ncxyz = np.array(ncxyz, order='F', dtype=np.int32) # Extract relevant parameters from the LAMMPS input script. mObj = LAMMPS_Input(input_file='./lammps/terminal.in') muf = mObj.dynamic_viscosity rhof = mObj.fluid_density dp = mObj.diameter rhop = mObj.density g = -mObj.gravity Vc = ((xyzL[0]-xyz_orig[0])/ncxyz[0])*((xyzL[1]-xyz_orig[1])/ncxyz[1])*((xyzL[2]-xyz_orig[2])/ncxyz[2]) epsf = (Vc - (np.pi/6)*(dp**3))/Vc # Initialise drag force object fObj = Stokes(muf=muf, dp=dp, epsf=epsf) # 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) # Main time loop for time in range(400):