Hi Amiya,
thanks for the report. We will try to find the problem, but first we need a
MWE, a mininal WORKING script. The one you provided ends with SyntaxError
because of the first "else" statement.
You can attach files to bug reports, so if you attached the script directly
as a file, it would be perfect
Thanks
Jan

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https://bugs.launchpad.net/bugs/1652529

Title:
  segmentation fault (core dumped)

Status in Yade:
  New

Bug description:
  Hi I am trying to run this code, which is an example given in the
  package. But every time i try to execute this file, i get segmentation
  fault error. I am using Ubuntu 16.04 LTS and Yade 2016.06a

  
  #!/usr/bin/python
  # -*- coding: utf-8 -*-

  """
  To run this script you need to have all 10 text files from 
https://yade-dem.org/wiki/CapillaryTriaxialTest
  in the same folder as you run this script in console!

  This script shows how to use Law2_ScGeom_CapillaryPhys_Capillarity. The user 
can switch between hertz and 
  linear model by setting "model_type"
  """

  model_type              = 1     #1=Hertz model with capillary forces,
  else linear model with capillary model

  #some parameters:
  shear_modulus         = 1e5
  poisson_ratio         = 0.3
  young_modulus = 2*shear_modulus*(1+poisson_ratio)
  friction              = 0.5
  angle                 = atan(friction)
  local_damping         = 0.01
  viscous_normal        = 0.021
  viscous_shear = 0.8*viscous_normal
  lowercorner           = Vector3(0,0,0)
  uppercorner           = Vector3(0.002,0.002,0.004)

  #creating a material (FrictMat):
  
id_SphereMat=O.materials.append(FrictMat(young=young_modulus,poisson=poisson_ratio,density=2500,frictionAngle=angle))
  SphereMat=O.materials[id_SphereMat]

  #generate particles:
  sp=pack.SpherePack()
  sp.makeCloud(lowercorner,uppercorner,.0002,rRelFuzz=.3)
  O.bodies.append([sphere(c,r,material=SphereMat) for c,r in sp])

  #generate boundary:
  
O.bodies.append(geom.facetBox(uppercorner/2,uppercorner/2,wire=True,fixed=True,material=SphereMat))

  #define engines:
  if model_type == 1:#hertz model with capillary forces
        O.engines=[
                ForceResetter(),
                InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
                InteractionLoop(
                        [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
                        
[Ip2_FrictMat_FrictMat_MindlinCapillaryPhys(label='ContactModel')],#for hertz 
model only
                        [Law2_ScGeom_MindlinPhys_Mindlin()]#for hertz model only
                ),
                
Law2_ScGeom_CapillaryPhys_Capillarity(capillaryPressure=10000),#for hertz model 
only
                NewtonIntegrator(damping=local_damping,gravity=(0,0,-9.81)),
        ]
        ContactModel.betan=viscous_normal
        ContactModel.betas=viscous_shear
        ContactModel.useDamping=True
  else:
        O.engines=[
                ForceResetter(),
                InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
                InteractionLoop(
                        [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
                        [Ip2_FrictMat_FrictMat_CapillaryPhys()],        #for 
linear model only
                        [Law2_ScGeom_FrictPhys_CundallStrack()],        #for 
linear model only
                ),
                
Law2_ScGeom_CapillaryPhys_Capillarity(capillaryPressure=10000),#for linear 
model only
                NewtonIntegrator(damping=local_damping,gravity=(0,0,-9.81)),
        ]

  #set time step and run simulation:
  O.dt=0.5*PWaveTimeStep()

  from yade import qt
  qt.View()
  print('Press PLAY button')
  #O.run(10000,True)

  
  looking forward to hear soon..!!

  Cheers
  Amiya

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