text: """
  Synopsis
  --------
  Define default global variables and indexes for element reference.
  
  Args
  ----
  None.
  
  Attributes
  ----------
  None.
  
  TODO
  ----
  None.
  """
  
  global small_pressure
  global rho, prs, eng
  global vx1, vx2, vx3
  global mvx1, mvx2, mvx3
  global u, v, w
  
  rho = 0
  prs = 1
  vx1 = 2
  vx2 = 3
  vx3 = 4
  
  eng = prs
  mvx1 = vx1
  mvx2 = vx2
  mvx3 = vx3
  