New question #646077 on Yade:
https://answers.launchpad.net/yade/+question/646077
I am trying to generate random periodic packing of spheres in a cube with
different volume fraction. I am looking for random packing of spheres with
volume fraction as one parameter. I have used yade to generate random dense
packing using the script below. Is there any easy way to generate packing for
different volume fractions in yade?
from yade import pack
pack.randomPeriPack(10,(100,100,100), rRelFuzz = 0.1).toSimulation()
O.step() # to initialize bounding boxes
xImages = [] # list of "edge" particles
for b in O.bodies:
xmin,xmax = O.cell.wrap(b.bound.min)[0], O.cell.wrap(b.bound.max)[0] # wrap is
important as physically the particles can be anywhere
if xmin > xmax: # this means that bounding box crosses periodic cell. You can
define various different conditions..
xImages.append(b)
pr = [[O.cell.wrap(b.state.pos),b.shape.radius] for b in xImages] # list or
[pos,radius] of "edge" particles. Now pos is always inside the cell
for i,(pos,r) in enumerate(pr):
shift = Vector3(O.cell.size[0],0,0) * (1 if pos[0]<0.5*O.cell.size[0] else -1)
# determine shift to create a periodic image +x... direction if particles is
near -x face and vice versa
pr[i][0] += shift
# saves images into a file
f = open("/home/nikita/1_1_x_1.dat","w")
f.write("x y z r\n")
f.writelines("%g %g %g %g\n"%(pos[0],pos[1],pos[2],r) for pos,r in pr)
f.close()
yImages = []
for b in O.bodies:
ymin,ymax = O.cell.wrap(b.bound.min)[1], O.cell.wrap(b.bound.max)[1]
if ymin > ymax:
yImages.append(b)
pr1 = [[O.cell.wrap(b.state.pos),b.shape.radius] for b in yImages]
for i,(pos,r) in enumerate(pr1):
shift = Vector3(0,O.cell.size[1],0) * (1 if pos[1]<0.5*O.cell.size[1] else -1)
pr1[i][0] += shift
# saves images into a file
f = open("/home/nikita/1_1_y_1.dat","w")
f.write("x y z r\n")
f.writelines("%g %g %g %g\n"%(pos[0],pos[1],pos[2],r) for pos,r in pr1)
f.close()
zImages = []
for b in O.bodies:
zmin,zmax = O.cell.wrap(b.bound.min)[2], O.cell.wrap(b.bound.max)[2]
if zmin > zmax:
zImages.append(b)
pr2 = [[O.cell.wrap(b.state.pos),b.shape.radius] for b in zImages]
for i,(pos,r) in enumerate(pr2):
shift = Vector3(0,0,O.cell.size[2]) * (1 if pos[2]<0.5*O.cell.size[2] else -1)
pr2[i][0] += shift
# saves images into a file
f = open("/home/nikita/1_1_z_1.dat","w")
f.write("x y z r\n")
f.writelines("%g %g %g %g\n"%(pos[0],pos[1],pos[2],r) for pos,r in pr2)
f.close()
# saving normal spheres
f = open("/home/nikita/normal_1.dat", "w")
f.write('x y z r\n')
for b in O.bodies:
p,r = O.cell.wrap(b.state.pos),b.shape.radius
f.write('%g %g %g %g\n' %(p[0],p[1],p[2],r))
f.close()
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