def eight_PBC():
"""
Returns a 8**3 system with density 10 and temperature T=.33.
Periodic boundary conditions in x,y and z.
"""
a = MPCD_system( (8,8,8) , 10, 1.)
a.null_shift()
print a
a.tau = .5
a.init_r()
a.init_v(.33)
return a
def eight_PBC_wallx_sheary():
"""
Returns a 8**3 system with density 10 and temperature T=.33.
Periodic boundary conditions in y and z.
Thermostatted walls in direction x applying a shear in the y direction.
"""
a = MPCD_system( (8,8,8) , 10, 1.)
a.null_shift()
print a
a.tau = .5
a.wall_v0[0,0,:] = np.array( [ 0., .2, 0. ] )
a.wall_v0[0,1,:] = np.array( [ 0., -.2, 0. ] )
a.wall_temp[0,0] = 0.33
a.wall_temp[0,1] = 0.33
a.init_r()
a.init_v(.33)
a.BC[0] = 1
return a
def eight_PBC_wallx_tempgrad_8():
"""
Returns a 8**3 system with density 10 and temperature T=.33.
Periodic boundary conditions in y and z.
Thermostatted walls in direction x with temperature of .13 and .53.
"""
a = MPCD_system( (32,8,8) , 10, 1.)
a.null_shift()
print a
a.tau = .5
a.wall_v0[0,0,:] = np.array( [ 0., .0, 0. ] )
a.wall_v0[0,1,:] = np.array( [ 0., -.0, 0. ] )
a.wall_temp[0,0] = 0.37
a.wall_temp[0,1] = 0.33
a.init_r()
a.init_v(.35)
a.BC[0] = 1
return a