it.command("""
config cfd
element cfd ini density {}
element cfd ini visc {}
cfd porosity poly
cfd buoy on
cfd interval 0
element cfd history id 3 zvelocity id 1
plot add hist 2 vs 1
""".format(fluid_density, fluid_viscosity))
element_volume = ca.volume()
oldu = ca.velocity()
old_force = (ca.drag().T/element_volume).T/fluid_density
old_porosity = ca.porosity()
r_factor = 0.5
smallest_size = 0.00095
time = 0.0
total_time = 4.0
max_dt = 0.0001
while time < total_time:
dt = 100.0
if (ca.velocity().max()>1.0e-7):
dt = float(0.5*smallest_size/ca.velocity().max())
if (max_dt < dt):
dt = max_dt
it.command("solve time {}".format(dt))
it.command("cfd update")
cfd relax 1
cfd update
call particles.p3dat
""".format(fluid_density, fluid_viscosity))
element_volume = ca.volume()
dt = 0.005
oldu = ca.velocity()
r_factor = 1.0
for i in range(10):
it.command("solve age {}".format(it.mech_age()+dt))
print "sending solve time"
cfd_link.send_data(dt) # solve interval
n=ca.porosity()
cfd_link.send_data(n)
ca.set_extra(1, np.zeros(it.element.cfd.count()))
ca.set_extra(2, np.zeros(it.element.cfd.count()))
ca.set_extra(3, np.zeros((it.element.cfd.count(),3)))
for b in it.ball.cfd.list():
for e,v in zip(b.elements(), b.overlaps()):
e.set_extra(1, e.extra(1)+v*b.ball().radius())
e.set_extra(2, e.extra(2)+v)
e.set_extra(3, e.extra(3)+v*b.ball().vel())
dbar = 2*ca.extra(1)/ca.extra(2)
ubar = (ca.extra(3).T/ca.extra(2)).T
du = np.linalg.norm(ubar.T - ca.velocity().T,axis=0)
re = (du*fluid_density*dbar/fluid_viscosity).T
beta = fluid_viscosity*(1-n)/dbar**2/n*(150*(1-n)+1.75*re)/fluid_density
#print beta, ubar
element cfd ini visc {}
cfd porosity poly
cfd buoy on
cfd relax 1
cfd update
call particles.p3dat
""".format(fluid_density, fluid_viscosity))
element_volume = ca.volume()
dt = 0.005
oldu = ca.velocity()
r_factor = 1.0
for i in range(20):
it.command("solve age {}".format(it.mech_age() + dt))
print "sending solve time"
cfd_link.send_data(dt) # solve interval
cfd_link.send_data(ca.porosity())
new_force = (ca.drag().T / element_volume).T / fluid_density
cfd_link.send_data(new_force)
print " cfd solve started"
ca.set_pressure(cfd_link.read_data())
ca.set_pressure_gradient(cfd_link.read_data())
newu = cfd_link.read_data()
ca.set_velocity(oldu * (1 - r_factor) + newu * r_factor)
oldu = newu
print " cfd solve ended"
cfd_link.send_data(0.0)
it.command('plot bitmap filename "porous2.png"')
cfd porosity poly
cfd buoy on
cfd relax 1
cfd update
call particles.p3dat
""".format(fluid_density, fluid_viscosity))
element_volume = ca.volume()
dt = 0.005
oldu = ca.velocity()
r_factor = 1.0
for i in range(20):
it.command("solve age {}".format(it.mech_age()+dt))
print "sending solve time"
cfd_link.send_data(dt) # solve interval
cfd_link.send_data(ca.porosity())
new_force = (ca.drag().T/element_volume).T/fluid_density
cfd_link.send_data(new_force)
print " cfd solve started"
ca.set_pressure(cfd_link.read_data())
ca.set_pressure_gradient(cfd_link.read_data())
newu = cfd_link.read_data()
ca.set_velocity(oldu*(1-r_factor)+newu*r_factor)
oldu = newu
print " cfd solve ended"
cfd_link.send_data(0.0)
it.command('plot bitmap filename "porous2.png"')